CN104269088B - Mechanical experimental device and method for conducting experiment by applying same - Google Patents
Mechanical experimental device and method for conducting experiment by applying same Download PDFInfo
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- CN104269088B CN104269088B CN201410578594.4A CN201410578594A CN104269088B CN 104269088 B CN104269088 B CN 104269088B CN 201410578594 A CN201410578594 A CN 201410578594A CN 104269088 B CN104269088 B CN 104269088B
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Abstract
The invention provides a mechanical experiment device applied to the technical field of experimental equipment and also relates to a method for conducting an experiment by applying the experimental device. One end of the bottom of an upright post (2) of the experimental device is connected with a base (1); the other end of the upright post (2) is connected with a cross beam (3); weight support bar plates (4) for placing weights (28) are respectively arranged at two end parts of the cross beam (3); strain gauges (29) are respectively attached to parts, positioned on two sides of the upright posts (2), of the cross beam (3); each strain gauge (29) is connected with a static resistance strain indicator (5). According to the experimental device disclosed by the invention, multiple mechanical experiments such as bending normal stress determination of the cross beam, a bending combination deformation experiment, an internal force determination experiment of a truss, internal force determination of a statically determinate structure, internal force determination of a statically indeterminate structure and the like can be performed conveniently and quickly; besides, the steps are simple and convenient, and the operation is simple, so that the experiments can be finished conveniently and quickly and the experiment result is accurate and reliable.
Description
Technical field
The invention belongs to technical field of experiment equipment, more specifically, it is to be related to a kind of dynamics experimental device, the present invention is same
When further relate to the method that a kind of described experimental provision of application is tested.
Background technology
In the experimental provision that structural mechanics experimental teaching is commonly used, the experimental provision of rigid frame or truss correlation is more common, its
Common feature is apparatus structure type is to change in process of the test.When therefore carrying out different experiments, need to make not
Same experimental provision, when so, not only increasing experimentation cost, and carrying out different experiments, needs using different experiment dresses
Put, also increase laboratory place, the service efficiency of impact experimental site.
Content of the invention
The technical problem to be solved is: for the deficiencies in the prior art, proposed by the invention is
A kind of bending normal stresses mensure that can carry out crossbeam, Subjected To Combined Axial Loading And Bending deformation experiment, the internal force determination experiment of truss, statically determinate structure
The dynamics experimental device of the kinds of experiments such as internal force measures, redundant structure internal force mensure, experimental provision of the present invention, passes through
Change the pull bar of different structure and sectional dimension between crossbeam and column, realize the conversion between dissimilar structure, particularly
Convenient conversion is realized between static determinacy and redundant structure.
Solve the problems, such as techniques discussed above, the technical scheme that the present invention takes is:
The present invention is a kind of dynamics experimental device, and described device is a kind of dynamics experimental device, including base, column,
Crossbeam, column bottom one end is connected with base, and the column other end is connected with crossbeam, and crossbeam both ends are respectively arranged to place weight
Code counterweight support bar disk, crossbeam be located at column both sides part paste foil gauge respectively, each foil gauge respectively with Static Electro
Resistance deformeter connects.
One end that described column is located at bottom is vertically connected on base, and crossbeam middle part is with column middle part even
Connect, be in t character form structure between crossbeam and column, between the column upper end of column and crossbeam left part and crossbeam right part respectively
Setting left lever and right pull bar.
On described crossbeam left part and crossbeam right part, an engaging lug is installed in each setting, and column upper end arranges left card
Hole and right hole clipping, left lever and right pull bar two ends are respectively provided with gag lever post, and two gag lever posts of left lever are arranged to respectively
It is stuck in the structure on the engaging lug and left hole clipping on crossbeam left part, two gag lever posts of right pull bar are arranged to be stuck in horizontal stroke
The structure on engaging lug and right hole clipping on beam right part, left lever and right pull bar are pasted foil gauge, crossbeam left part respectively
Paste foil gauge with the four sides of crossbeam right part respectively, each foil gauge connects and composes measurement electricity respectively with static resistance deformeter
Bridge.
Described column both sides are respectively provided with left draw-in groove and right draw-in groove, and crossbeam includes left transverse beam assembly and right transverse beam assembly,
One end that left transverse beam assembly is connected with column arranges left head clamp, and one end that right transverse beam assembly is connected with column arranges right clamping
Plate, left head clamp and right head clamp are installed in left draw-in groove and right draw-in groove respectively, and left draw-in groove and right draw-in groove both sides are respectively provided with 3
Bolt, bolt is set to the knot being clamped on left transverse beam assembly and right transverse beam assembly in left draw-in groove and right draw-in groove respectively
Structure, when connecting using 1 bolt on crossbeam center line, constitutes chain connection, when using 3 bolts even
When connecing, constitute fixing end and connect.
Described left lever includes left rod member and left rod member, passes through adjusting screw rod between left rod member and left rod member
Connect, right pull bar is included right rod member and right rod member, connected by adjusting screw rod, Zola between right rod member and right rod member
The foil gauge pasted on bar and right pull bar and static resistance deformeter connect and compose measuring bridge, and described base 1 is set to ten
Character form structure.
The present invention also relates to the method that a kind of above-mentioned dynamics experimental device of application carries out statically determinate structure experiment, described
The step carrying out statically determinate structure experiment be:
Crossbeam and column are connected into t character form structure, composition fixing end all installed by 3 bolts, divide 2 groups and enter simultaneously
Row experiment.The foil gauge of crossbeam left part and crossbeam right part is accessed the measuring bridge of static resistance deformeter, using single armed
Half-bridge connection, is active gage by the foil gauge on crossbeam left part and crossbeam right part, crossbeam right part foil gauge is respectively
Temperature-compensating plate, then the foil gauge of the person's of choosing not stand under load is as temperature-compensating plate, points 2 groups simultaneously in crossbeam left part and crossbeam right-hand member
The counterweight support bar disk in portion loads counterweight, using equivalent stepwise loading method, measures the work of crossbeam left part and crossbeam right part
The strain value of piece, according to formula σMeasurement=e εMeasurementCalculate the stress at crossbeam left part and crossbeam right part active gage, respectively with material
Bending normal stresses comparison of computational results in material mechanics, calculates relative error, verifies computing formula correctness.This is the transversal force of beam
Bending normal stresses are tested.
The described step carrying out statically determinate structure experiment is:
1) crossbeam and column are connected into t character form structure, be only positioned at 1 bolt on crossbeam center line, structure
It is in the hinge connection, then left lever and right pull bar are installed, constitute static determinacy triangle rack and panel construction, its middle cross beam is compressed to be combined with bending
Deformation, left lever and the deformation of right pull bar Tensile.Answering crossbeam left part, crossbeam right part, left lever and right pull bar respectively
Become piece and access static resistance deformeter and constitute measuring bridge, using single armed half-bridge connection and equivalent stepwise loading method, first by
The pull bar of a diameter of 10mm, measures left lever, the strain of right pull bar, according still further to the stress at σ=e ε evaluation work piece and pull bar
Axle power, compare with the calculated results of mechanics of materials stretcher strain, calculate relative error, simultaneously measurement crossbeam left part and
The strain of the active gage at crossbeam right part, with stretching compared with the result of calculation of bending combined deformation, calculates relative error；
2) on the premise of keeping loading load constant, change the dissimilar left lever with size and right pull bar, observe
The strain value of the foil gauge in the axle power of left lever and right pull bar and left lever and right pull bar has unchanged；Observe crossbeam left part
With strain at the foil gauge of crossbeam right part have unchanged, if unchanged, illustrate the internal force of statically determinate structure and bar material and section
Face size is unrelated；
3) on the premise of keeping loading load constant, the length of regulation left lever and right pull bar, observation crossbeam left part,
The strain value of the foil gauge on crossbeam right part, left lever and right pull bar has unchanged；If unchanged, statically determinate structure internal force is described
Unrelated with the foozle of left lever and right pull bar.
4) left lever and right pull bar are substituted with truss structure, repeat the above steps 1)～2) it is simply that the power of truss structure
Learn experiment.
The present invention also relates to the method that a kind of above-mentioned dynamics experimental device of application carries out redundant structure experiment, institute
The step carrying out redundant structure experiment stated is:
1) crossbeam and column are connected into t character form structure, composition fixing end all installed by 3 bolts, Zola is installed
Bar and right pull bar, constitute indeterminate triangle rack and panel construction；The foil gauge respectively crossbeam being located at column both sides accesses static resistance
The measuring bridge of deformeter；
2) single armed half-bridge connection and equivalent stepwise loading method, the strain of the foil gauge at measurement left lever and right pull bar are adopted
Value, compared with the result of calculation obtaining with the method solving redundant structure in structural mechanics, calculates relative error；
3) keep loading that load is constant, rotate the regulation handle on left lever and right pull bar, elongate or shorten left lever and
Right pull bar length, foozle on simulation left lever and right pull bar, at observation crossbeam left part, crossbeam right part, foil gauge should
Variate has unchanged, if changing, illustrates that the internal force of redundant structure is closely related with the foozle of left lever and right pull bar；
4) on the premise of keeping loading load constant, change dissimilar and size brace, observe crossbeam left end
At portion and crossbeam right part, the strain value of foil gauge has unchanged, and internal force and the left lever of redundant structure, if changing, are described
Relevant with sectional dimension with the material of right pull bar.
Using technical scheme, following beneficial effect can be obtained:
Dynamics experimental device of the present invention, by change column and crossbeam connection type or change different structure and
The left lever of sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional dynamics experimental device,
The bending normal stresses mensure of crossbeam, the internal force determination experiment of Subjected To Combined Axial Loading And Bending deformation experiment, truss, quiet can conveniently and efficiently be carried out
The kinds of experiments such as fixed structure internal force measures, redundant structure internal force mensure, applied widely, experimental procedure is easy, simple to operate,
Result of the test is accurately and reliably.Experimental provision of the present invention adopt symmetric triangular rack and panel construction, compact conformation, can 2 groups experiment
Carry out simultaneously, improve test efficiency.
Brief description
To this specification, the mark of the content expressed by each accompanying drawing and in figure makes brief description below:
Fig. 1 is the positive structure diagram of dynamics experimental device of the present invention；
Fig. 2 is the cross section structure diagram in the a-a face of dynamics experimental device described in Fig. 1；；
Accompanying drawing acceptance of the bid note is respectively as follows: 1, base；2nd, column；3rd, crossbeam；4th, counterweight support bar disk；5th, static resistance strain
Instrument；6th, column upper end；7th, crossbeam left part；8th, crossbeam right part；9th, left lever；10th, right pull bar；11st, engaging lug；12nd, left
Hole clipping；13rd, right hole clipping；14th, left draw-in groove；15th, right draw-in groove；16th, left transverse beam assembly；17th, right transverse beam assembly；18th, left head clamp；
19th, right head clamp；20th, bolt；21st, left rod member；22nd, left rod member；23rd, adjusting screw rod；24th, right rod member；25th, right
Rod member；26th, adjusting screw rod；27th, gag lever post；28th, counterweight；29th, foil gauge.
Specific embodiment
Below against accompanying drawing, by the description to embodiment, each structure for example involved to the specific embodiment of the present invention
Mutual alignment between the shape of part, construction, each several part and annexation, the effect of each several part and operation principle etc. are made further
Detailed description:
As shown in accompanying drawing 1, accompanying drawing 2, the present invention is a kind of dynamics experimental device, and described experimental provision includes base 1, stands
Post 2, crossbeam 3, column 2 bottom end is connected with base 1, and column 2 other end is connected with crossbeam 3, and crossbeam 3 both ends are respectively provided with
For placing the counterweight support bar disk 4 of counterweight 28, the part that crossbeam 3 is located at column 2 both sides pastes foil gauge 29 respectively, and each should
Become piece 29 to be connected with static resistance deformeter 5 respectively.By changing the connection type of column and crossbeam or changing different structure, material
The left lever of material and sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional experimental provision,
The bending normal stresses mensure of crossbeam, the internal force determination experiment of Subjected To Combined Axial Loading And Bending deformation experiment, truss, quiet can conveniently and efficiently be carried out
The Experiments of Machanics measurement such as fixed structure internal force measures, redundant structure internal force measures, due to using symmetric triangular rack and panel construction, can 2
Group experiment is carried out simultaneously, and measurement process is convenient, and measurement data is accurate.
One end that described column 2 is located at bottom is vertically connected on base 1, crossbeam 3 middle part and column 2 pars intermedia
Position connects, and is in t character form structure between crossbeam 3 and column 2, the upper end 6 of column 2 and crossbeam left part 7 and crossbeam right part 8 it
Between be respectively provided with left lever 9 and right pull bar 10.Left lever 9 and right pull bar 10 can be replaced by experimentation and have different materials
Material, different cross section shape and size pull bar, or it is replaced by the pull bar of truss structure form, it is convenient for mechanical meaurement.
On described crossbeam left part 7 and crossbeam right part 8, an engaging lug 11 is installed in each setting, and column upper end 6 sets
Put left hole clipping 12 and right hole clipping 13, left lever 9 and right pull bar 10 two ends are respectively provided with gag lever post 27, two limits of left lever 9
The structure on engaging lug 11 and left hole clipping 12 that position bar 27 is arranged to be stuck on crossbeam left part 7, the two of right pull bar 10
The structure on engaging lug 11 and right hole clipping 13 that individual gag lever post 27 is arranged to be stuck on crossbeam right part 8, left lever 9 He
Foil gauge is pasted on right pull bar 10, foil gauge is pasted respectively in the four sides of crossbeam left part 7 and crossbeam right part 8 respectively, each should
Change piece is connected with static resistance deformeter 5 respectively and constitutes measuring bridge.Said structure is it is achieved that the reliability of left lever and right pull bar
Connect, and left lever and right pull bar remove and install convenient and swift, can effectively improve the development of experimental work.
Described column 2 both sides are respectively provided with left draw-in groove 14 and right draw-in groove 15, and crossbeam 3 includes left transverse beam assembly 16 and right horizontal stroke
Beam assembly 17, one end that left transverse beam assembly 16 is connected with column 2 arranges left head clamp 18, and right transverse beam assembly 17 is connected with column 2
One end right head clamp 19 is set, left head clamp 18 and right head clamp 19 are installed in left draw-in groove 14 and right draw-in groove 15 respectively, left
Draw-in groove 14 and right draw-in groove 15 both sides are respectively provided with 3 bolts 20, and bolt 20 is set to respectively by left transverse beam assembly 16
It is clamped on the structure in left draw-in groove 14 and right draw-in groove 15 with right transverse beam assembly 17.By such structure, enable left crossbeam group
Part 16 and right transverse beam assembly 17 respectively with being reliably connected and dismantling of column both sides, be easy to Experiments of Machanics work and conveniently carry out.
Described left lever 9 includes left rod member 21 and left rod member 22, passes through between left rod member 21 and left rod member 22
Adjusting screw rod 23 connects, and right pull bar 10 includes right rod member 24 and right rod member 25, logical between right rod member 24 and right rod member 25
Overregulate screw rod 26 to connect, left lever 9 is connected with static resistance deformeter 5 structure respectively with the foil gauge pasted on right pull bar 10
Become measuring bridge.
Described base 1 is set to decussate texture, improves stability when base is placed.
The present invention also relates to the method that a kind of above-mentioned dynamics experimental device of application carries out statically determinate structure experiment, can
Conveniently and efficiently complete statically determinate structure experiment, the described step carrying out statically determinate structure experiment is:
Crossbeam 3 and column 2 are connected into t character form structure, composition fixing end all installed by 3 bolts, divide 2 groups simultaneously
Tested.The foil gauge of crossbeam left part 7 and crossbeam right part 8 is accessed the measuring bridge of static resistance deformeter 5, adopt
Single armed half-bridge connection, the foil gauge on crossbeam left part 7 and crossbeam right part 8 is as active gage, then the strain of the person's of choosing not stand under load
Piece loads counterweight as temperature-compensating plate, the counterweight support bar disk 4 in crossbeam left part 7, using equivalent stepwise loading method, measures
The strain value of the active gage of crossbeam left part 7 and crossbeam right part 8, according to formula σMeasurement=e εMeasurementCalculate crossbeam left part 7 and horizontal stroke
Stress at the active gage of beam right part 8, respectively with the mechanics of materials in bending normal stresses comparison of computational results, calculate relatively by mistake
Difference, verifies computing formula correctness.This is the shear bending direct stress experiment of beam.
1) crossbeam 3 and column 2 are connected into t character form structure, are only positioned at 1 bolt on crossbeam center line,
Constitute chain connection, then left lever 9 and right pull bar 10 are installed, constitute static determinacy triangle rack and panel construction, its middle cross beam 5 is compressed and curved
Bent combined deformation, left lever 9 and the deformation of right pull bar 10 Tensile.Respectively by crossbeam left part 7, crossbeam right part 8, left lever 9
Access static resistance deformeter 5 with the foil gauge of right pull bar 10 and constitute measuring bridge, using single armed half-bridge connection and equivalent step by step
Loading Method, first by the pull bar of a diameter of 10mm, measures left lever 9, the strain of right pull bar 10, calculates work according still further to σ=e ε
Make the axle power of stress at piece and pull bar, compared with the calculated results of mechanics of materials stretcher strain, calculate relative error,
Measure the strain of the active gage at crossbeam left part 7 and crossbeam right part 8, the calculating knot with stretching and bending combined deformation simultaneously
Fruit compares, and calculates relative error；
2) on the premise of keeping loading load constant, change the dissimilar left lever 9 with size and right pull bar 10, see
Examine the foil gauge on left lever 9 and the axle power and left lever 9 and right pull bar 10 of right pull bar 10 strain value have unchanged；Observe horizontal
At the foil gauge of beam left part 7 and crossbeam right part 8, strain has unchanged, and internal force and the bar of statically determinate structure, if unchanged, are described
Part material and sectional dimension are unrelated；
3) on the premise of keeping loading load constant, adjust the length of left lever 9 and right pull bar 10, observe crossbeam left end
The strain value of the foil gauge on portion 7, crossbeam right part 8, left lever 9 and right pull bar 10 has unchanged；If unchanged, static determinacy is described
Structural internal force is unrelated with crossbeam 3 foozle.
4) left lever and right pull bar are substituted with truss structure, repeat the above steps 1)～2) it is simply that the power of truss structure
Learn experiment.
The present invention also relates to the method that a kind of above-mentioned dynamics experimental device of application carries out redundant structure experiment, energy
Enough redundant structures that conveniently and efficiently completes are tested, and the described step carrying out redundant structure experiment is:
1) crossbeam 3 and column 2 are connected into t character form structure, composition fixing end all installed by 3 bolts, install left
Pull bar and right pull bar, constitute indeterminate triangle rack and panel construction；The foil gauge respectively crossbeam 3 being located at column 2 both sides position accesses
The measuring bridge of static resistance deformeter 5, installs left lever 9 and right pull bar 10, constitutes indeterminate triangle rack and panel construction；
2) single armed half-bridge connection and equivalent stepwise loading method are adopted, the foil gauge at measurement left lever 9 and right pull bar 10
Strain value, compared with the result of calculation obtaining with the method solving redundant structure in structural mechanics, calculates relative error；
3) keep loading load constant, rotate the adjusting screw rod 23 on left lever 9 and right pull bar 10 and adjusting screw rod
26, elongate or shorten left lever 9 and right pull bar 10 length, foozle on simulation left lever 9 and right pull bar 10, observe crossbeam left
At end 7, crossbeam right part 8, the strain value of foil gauge has unchanged, and internal force and the Zola of redundant structure, if changing, are described
Bar 9, right pull bar 10 foozle closely related；
4) on the premise of keeping loading load constant, change dissimilar and size brace, observe crossbeam left end
At portion 7 and crossbeam right part 8, the strain value of foil gauge has unchanged, and internal force and the Zola of redundant structure, if changing, are described
Bar 9, right pull bar 10 material relevant with sectional dimension.
Dynamics experimental device of the present invention, changes the connection type of column and crossbeam or changes different materials, structure
With the left lever of sectional dimension and right pull bar, realize the conversion between dissimilar structure, form multi-functional Experiments of Machanics dress
Put, can conveniently and efficiently carry out the bending normal stresses mensure of crossbeam, the internal force of Subjected To Combined Axial Loading And Bending deformation experiment, truss measures in fact
Test, the kinds of experiments such as statically determinate structure internal force measures, redundant structure internal force measures, applied widely, experimental procedure is easy, operation
Simply, result of the test is accurately and reliably.Experimental provision of the present invention adopts symmetric triangular rack and panel construction, and compact conformation can 2 groups
Experiment is carried out simultaneously, improves test efficiency.
Above in conjunction with accompanying drawing, exemplary description has been carried out to the present invention it is clear that concrete implementation of the present invention be not subject to above-mentioned
The restriction of mode, as long as employing method of the present invention design and the various improvement that carry out of technical scheme, or not improved incite somebody to action this
The design of invention and technical scheme directly apply to other occasions, all within the scope of the present invention.
Claims (6)
1. a kind of dynamics experimental device, described experimental provision includes base (1), column (2), crossbeam (3), column (2) bottom
One end is connected with base (1), and column (2) other end is connected with crossbeam (3), and crossbeam (3) both ends are respectively arranged to place weight
Counterweight support bar disk (4) of code (28), the part that crossbeam (3) is located at column (2) both sides pastes foil gauge (29) respectively, and each should
Become piece (29) to be connected with static resistance deformeter (5) respectively；
It is characterized in that: one end that described column (2) is located at bottom is vertically connected on base (1), crossbeam (3) middle part
It is connected with column (2) middle part, be in t character form structure between crossbeam (3) and column (2), the column upper end (6) of column (2)
It is respectively provided with left lever (9) and right pull bar (10) and crossbeam left part (7) and crossbeam right part (8) between；
An engaging lug (11), column upper end are installed in described crossbeam left part (7) and crossbeam right part (8) upper each setting
(6) left hole clipping (12) and right hole clipping (13) are set, and left lever (9) and right pull bar (10) two ends are respectively provided with gag lever post (27),
Two gag lever posts (27) of left lever (9) are arranged to the engaging lug (11) being stuck on crossbeam left part (7) and left hole clipping
(12) structure on, two gag lever posts (27) of right pull bar (10) are arranged to the connection being stuck on crossbeam right part (8)
Foil gauge, crossbeam left part is pasted respectively on structure on ear (11) and right hole clipping (13), left lever (9) and right pull bar (10)
(7) and foil gauge is pasted respectively in the four sides of crossbeam right part (8), each foil gauge is connected with static resistance deformeter (5) respectively
Constitute measuring bridge.
2. dynamics experimental device according to claim 1 it is characterised in that: described column (2) both sides are respectively provided with a left side
Draw-in groove (14) and right draw-in groove (15), crossbeam (3) includes left transverse beam assembly (16) and right transverse beam assembly (17), left transverse beam assembly (16)
The one end being connected with column (2) arranges left head clamp (18), and one end that right transverse beam assembly (17) is connected with column (2) arranges right card
Tight plate (19), left head clamp (18) and right head clamp (19) are installed in left draw-in groove (14) and right draw-in groove (15) respectively, left draw-in groove
(14) and right draw-in groove (15) both sides are respectively provided with bolt (20), bolt (20) is set to respectively by left transverse beam assembly
And right transverse beam assembly (17) is clamped on the structure in left draw-in groove (14) and right draw-in groove (15) (16).
3. dynamics experimental device according to claim 2 it is characterised in that: described left lever (9) includes left rod member
(21) and left rod member (22), pass through adjusting screw rod (23) between left rod member (21) and left rod member (22) to connect, right pull bar
(10) include right rod member (24) and right rod member (25), between right rod member (24) and right rod member (25), pass through adjusting screw rod
(26) connect, described base (1) is set to decussate texture.
4. dynamics experimental device according to claim 3 carry out statically determinate structure experiment method it is characterised in that: described
The step carrying out statically determinate structure experiment is:
Crossbeam (3) and column (2) are connected into t character form structure, by the foil gauge of crossbeam left part (7) and crossbeam right part (8)
Access static resistance deformeter (5) and constitute measuring bridge, divide 2 groups and test, using single armed half-bridge connection, that is, respectively by crossbeam simultaneously
, as active gage, the foil gauge of reselection not stand under load is as temperature-compensating for foil gauge on left part (7) and crossbeam right part (8)
Piece, counterweight support bar disk (4) in crossbeam left part (7) loads counterweight, using equivalent stepwise loading method, measures crossbeam left part
(7) and crossbeam right part (8) active gage strain value, according to formula σMeasurement=e εMeasurementCalculate crossbeam left part (7) and crossbeam is right
Stress at end (8) active gage, respectively with the mechanics of materials in bending normal stresses comparison of computational results, calculate relative error,
Checking computing formula correctness.
5. dynamics experimental device according to claim 3 carry out statically determinate structure experiment method it is characterised in that: described
The step carrying out statically determinate structure experiment is:
1) crossbeam (3) and column (2) are connected into t character form structure, be only positioned at 1 positioning spiral shell on crossbeam (1) center line
Bolt, constitutes chain connection, then installs left lever (9) and right pull bar (10), constitutes static determinacy triangle rack and panel construction, its middle cross beam (3)
Compressed with bending combined deformation, left lever (9) and right pull bar (10) Tensile deform, respectively by crossbeam left part (7), crossbeam
The foil gauge of right part (8), left lever (9) and right pull bar (10) accesses static resistance deformeter (5) and constitutes measuring bridge, adopts
Single armed half-bridge connection and equivalent stepwise loading method, first by the pull bar of a diameter of 10mm, measure left lever (9), right pull bar
(10) strain, according still further to the axle power of the stress at σ=e ε evaluation work piece and pull bar, the theory with mechanics of materials stretcher strain
Result of calculation compares, and calculates relative error, measures the active gage at crossbeam left part (7) and crossbeam right part (8) place simultaneously
Strain, with stretching compared with the result of calculation of bending combined deformation, calculates relative error；
2) on the premise of keeping loading load constant, change the dissimilar left lever (9) with size and right pull bar (10), see
The strain value examining the foil gauge on left lever (9) and the axle power and left lever (9) and right pull bar (10) of right pull bar (10) has or not change
Change；Observe crossbeam left part (7) and crossbeam right part (8) foil gauge at strain have unchanged, if unchanged, illustrate static determinacy knot
The internal force of structure is unrelated with bar material and sectional dimension；
3) on the premise of keeping loading load constant, adjust the length of left lever (9) and right pull bar (10), observe crossbeam left end
The strain value of the foil gauge on portion (7), crossbeam right part (8), left lever (9) and right pull bar (10) has unchanged；If unchanged,
Illustrate that statically determinate structure internal force is unrelated with left lever (9) and right pull bar (10) foozle；
4) left lever (9) and right pull bar (10) are substituted with truss structure, repeat the above steps 1)～2) it is simply that truss structure
Experiments of Machanics.
6. dynamics experimental device according to claim 3 carry out redundant structure experiment method it is characterised in that: described
The step carrying out redundant structure experiment be:
1) crossbeam (3) and column (2) are connected into t character form structure, left lever (9) and right pull bar (10) are installed, constitute indeterminate
Triangle rack and panel construction；Respectively crossbeam (3) is located at foil gauge, left lever (9) and the right pull bar (10) at column (2) both sides position
Foil gauge accesses static resistance deformeter (5) composition measuring bridge；
2) single armed half-bridge connection and equivalent stepwise loading method are adopted, the foil gauge at measurement left lever (9) and right pull bar (10) place
Strain value, compared with the result of calculation obtaining with the method solving redundant structure in structural mechanics, calculates relative error；
3) keep loading the regulation handle that load is constant, in rotation left lever (9) and right pull bar (10), elongate or shorten left lever
(9) and right pull bar (10) length, simulation left lever (9) and the upper foozle of right pull bar (10), observe crossbeam left part (7), horizontal stroke
The strain value of beam right part (8) place foil gauge has unchanged, if changing, the internal force of redundant structure and crossbeam (3) is described
Foozle is closely related；
4) on the premise of keeping loading load constant, change dissimilar and size brace, observe crossbeam left part (7)
Having unchanged with the strain value of crossbeam right part (8) place foil gauge, if changing, the internal force of statically determinate structure and crossbeam (3) being described
Material is relevant with sectional dimension.
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| SU1606989A1 (en) * | 1988-12-16 | 1990-11-15 | Усть-Каменогорский Строительно-Дорожный Институт | Educational appliance in mechanics |
| SU1734118A1 (en) * | 1989-10-23 | 1992-05-15 | Пензенский Государственный Педагогический Институт Им.В.Г.Белинского | Training device for mechanics |
| US6773264B2 (en) * | 2002-10-18 | 2004-08-10 | Arthur Joseph Schoendorff | Teaching apparatus for mechanics principles |
| CN101303813A (en) * | 2008-01-30 | 2008-11-12 | 烟台大学 | Structure mechanics combined experimental device |
| CN201421416Y (en) * | 2009-04-03 | 2010-03-10 | 天津商业大学 | Simple experimental facility suitable for university material mechanics course |
| CN201984688U (en) * | 2011-01-05 | 2011-09-21 | 辽宁工程技术大学 | Multipurpose static combined teaching aid |
| CN202008764U (en) * | 2011-01-10 | 2011-10-12 | 刘莹 | Mechanical demonstration teaching tool |
| CN102394020B (en) * | 2011-09-09 | 2013-04-24 | 哈尔滨工业大学（威海） | Building-block plane structure mechanical property universal experiment platform |
| CN102426808A (en) * | 2011-11-03 | 2012-04-25 | 西安交通大学 | Planar truss structural stability mechanics experimental apparatus |
| CN202485991U (en) * | 2012-04-03 | 2012-10-10 | 德州学院 | Rigid material strain test instrument |
| CN203118300U (en) * | 2013-04-02 | 2013-08-07 | 李颖 | Demonstration teaching aid for mechanics teaching |
| CN203148787U (en) * | 2013-04-15 | 2013-08-21 | 中国人民解放军空军第一航空学院 | Device for fatigue test of plane stress state |
| CN103247209A (en) * | 2013-04-23 | 2013-08-14 | 南昌航空大学 | Experimental device for testing internal stress of constant strength beam and torsion combination beam with electric measurement method |
| CN103761910B (en) * | 2014-01-13 | 2016-05-25 | 河海大学 | A kind of structural mechanics displacement method experimental provision and structural mechanics displacement method demenstration method |
| CN104050848A (en) * | 2014-06-10 | 2014-09-17 | 安徽农业大学 | Material mechanics multi-experiment synchronous measuring device |
| CN204102392U (en) * | 2014-10-25 | 2015-01-14 | 安徽工程大学 | A kind of dynamics experimental device |
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