CN201488709U - Constant-strength cantilever beam - Google Patents
Constant-strength cantilever beam Download PDFInfo
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- CN201488709U CN201488709U CN2009201668147U CN200920166814U CN201488709U CN 201488709 U CN201488709 U CN 201488709U CN 2009201668147 U CN2009201668147 U CN 2009201668147U CN 200920166814 U CN200920166814 U CN 200920166814U CN 201488709 U CN201488709 U CN 201488709U
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Abstract
The utility model relates to a constant-strength cantilever beam, which comprises a square pillar, a cantilever master-part fixing segment, a cantilever master-part working segment, a cantilever master-part loading segment, a vertical supporting rib plate and a fixing briquette, wherein the cantilever master-part fixing segment, the cantilever master-part working segment, the cantilever master-part loading segment are formed by a piece of plate with identical thickness. The constant-strength cantilever beam is characterized in that the shape of the integrated plate of the cantilever master-part working segment and the cantilever master-part loading segment is of the isosceles triangle, the top point is of the loading point of the top end of the cantilever master-part loading segment, the two equal edges form the side edges of the integrated plate, the bottom edge is arranged on the cantilever master-part fixing segment; the base angle alpha of the isosceles triangle is 83.16 degrees; therefore, the constant-strength cantilever beam has the advantages of simple, stable and reliable structure, convenient use and the like, thereby effectively improving the reliability of the test data and the testing efficiency and providing the powerful support for the development of the strain sensor technology.
Description
Technical field
The utility model is a kind of equi intensity cantilever, can be applied to the various performance tests of strain measurement system, be primarily aimed at the contrast test and the various environmental test of fiber Bragg grating strain sensor and resistance strain gage, carry out sensor performance and technique for sticking research and relevant Testing And Regulating work.Belong to field of measuring technique.
Background technology
At present, the in vitro application of cantilever beam structure is very general, except the test of strain measurement system, can also be applied in the various vibration tests, and the load form also can be varied.But normally used semi-girder substantially all is the regular rectangular structure of shape, and under the concentrated force loading, its axial stress is all unequal everywhere on the surface.Like this, the strain of measured surface might uneven distribution occur in the length of a strain sensor, and this brings certain influence can for the measurement of strain.Therefore, as the device that is specifically designed to the test of strain transducer measurement performance, the influence that should avoid the strain uneven distribution to bring.
Summary of the invention
The utility model designs at above-mentioned the deficiencies in the prior art just a kind of equi intensity cantilever is provided, the axial stress that its objective is the upper surface that makes semi-girder or lower surface equates everywhere, can avoid the inhomogeneous influence that brings of Strain Distribution, in addition, the axial strain of beam body upper surface equates everywhere, bring great convenience also can for the contrast test between the strain sensor, more can avoid in the comparison process because the error that the conversion of strain value brings.
The purpose of this utility model realizes by following measure:
This kind equi intensity cantilever, comprise square pillar, semi-girder main part canned paragraph, semi-girder main part active section, semi-girder main part loaded segment, vertical support floor and fixing briquetting, wherein, semi-girder main part canned paragraph, semi-girder main part active section and semi-girder main part loaded segment are formed by an equal thickness plate, it is characterized in that: semi-girder main part active section and semi-girder main part loaded segment integrated board be shaped as isosceles triangle, its summit is the load(ing) point on semi-girder main part loaded segment top, the side of its two equilateral formation semi-girder main part active section and semi-girder main part loaded segment integrated board, its base is on semi-girder main part canned paragraph, and the base angle of this isoceles triangle shape is 83.16 °.
This kind equi intensity cantilever is made up of a series of removable semi-girder main components and hold-down support.According to mechanics of materials formula, the semi-girder of square-section is in the time spent of doing that free end bears transverse load F, and at axially any xsect x place, the axial tensile stress size of upper and lower surface is:
In the formula: x is an initial point with the semi-girder free end, and forward points to the coordinate figure of stiff end;
σ
m, the axially any xsect x place of semi-girder, the size of upper and lower surface axial stress;
F, the horizontal concentrated force magnitude of load of free end;
B, the axially any xsect x place of semi-girder, the cross-sectional width of beam;
H, the axially any xsect x place of semi-girder, the tranverse sectional thickness of beam.
Can know according to (1) formula, if the cross-sectional width b of beam with the proportional variation of x, so under the constant condition of the tranverse sectional thickness h of beam and free end load F, upper and lower surface axial stress size axially arbitrarily xsect all be identical.Therefore, the technical program is by the design to the geometric configuration of semi-girder, at the active section of semi-girder main component, can guarantee the upper surface of beam body or lower surface arbitrarily any axial stress or axial strain all equate, to satisfy special test needs.
Description of drawings
Fig. 1 is the structural representation of device of the present utility model
Fig. 2 is the upward view of Fig. 1
Embodiment
Below with reference to drawings and Examples technical solutions of the utility model are further described:
Shown in accompanying drawing 1～2, this kind equi intensity cantilever, comprise square pillar 1, semi-girder main part canned paragraph 2, semi-girder main part active section 3, semi-girder main part loaded segment 4, vertical support floor 5 and fixing briquetting 6, wherein, square pillar 1 and vertical support floor 5 constitute the hold-down support part, square pillar 1 top xsect compares broad, enough big with semi-girder main component canned paragraph 2 contacts area, the canned paragraph 2 that can guarantee the semi-girder main component has enough insertion depths and contact area, can guarantee the boundary condition of semi-girder at stiff end.Adopt bolt between semi-girder main part canned paragraph 2 and the hold-down support, can support the replacing of semi-girder main component, for test brings convenience.Under the constant prerequisite of main component basic configuration, can change its size or material as required.In the contrast test of many group pasters (fiber grating or foil gauge), can on a plurality of identical semi-girder main components, shift to an earlier date the prefabricated paster of respectively organizing, in single test, it is constant to keep test condition to stablize then, by changing the high efficiency contrast test of finishing of main component.
The stressing conditions of bearing bottom surface when loading, vertical support floor 5 adopts triangular design, both can alleviate architecture quality, can guarantee to carry the vertical of situation lower supporting rod and surface level again to greatest extent.Semi-girder main part canned paragraph 2, semi-girder main part active section 3 and semi-girder main part loaded segment 4 are formed by an equal thickness plate, it is characterized in that: semi-girder main part active section 3 is the isosceles trapezoid shape, base angle is 83.16 °, the summit of the extended line on its both sides is the load(ing) point 7 on semi-girder main part loaded segment 4 tops, the load(ing) point 7 on semi-girder main part loaded segment 4 tops is a cab-over design, the application point that applies concentrated force load is the point midway of tack just, so both avoided instability in the triangular apex loading, take into account the equal strength requirement that has guaranteed active section upper and lower surface stress again, load must be perpendicular to the concentrated force of XY face, and the general mode that hangs weight that adopts loads.Semi-girder main part loaded segment 4 is a rectangle bulk, has guaranteed the stability of loading and the accuracy of loading position.As long as the load form does not change, the upper and lower surface of semi-girder main part active section 3, be that the surface axial strain everywhere of normal is all identical promptly with the Z axle, therefore, can be on active section [3] surface the optional position in a big way carry out various performance tests and research along the axial arranged strain sensor of semi-girder main component.
This equal strength semi-girder one-piece construction has guaranteed the plain bending distortion of beam about the symmetric design of x axle, reduces the error that buckling deformation causes.Adopt the horizontal base plate in the vertical support floor 5 replacement traditional experiment chamber girder constructions, can reserve bigger free space, can guarantee the level of beam main component position for semi-girder hangs the weight loading.The triangle of vertical support floor 5 is also according to real load situation design in the test, when free end applies horizontal concentrated force load, the moment of flexure that vertical ribs plate portion bears also is big more the closer to the square pillar of stiff end, therefore leg-of-mutton vertical support floor can be resisted bearing flexural deformation to greatest extent, thereby guarantees the vertical of the square pillar of stiff end and surface level.In addition, the design of the vertical support floor of triangle had both alleviated integrally-built weight, had also stayed very big free space for hanging the weight loading.
The utility model device for the test of strain sensor to the inhomogeneity requirement of measured surface strain, design the equally distributed equi intensity cantilever of strain, it can reach for the technical study of strain sensor relevant comparison and calibration practical reliably experimental rig is provided, have simple in structure, reliable and stable, the advantage such as easy to use. In addition, the utlity model has stronger practical value, if can be promoted use in the test field of strain sensing research, reliability and test efficiency that will the Effective Raise test data provide powerful support for for the development of strain sensing technology provides.
Claims (3)
1. equi intensity cantilever, comprise square pillar (1), semi-girder main part canned paragraph (2), semi-girder main part active section (3), semi-girder main part loaded segment (4), vertical support floor (5) and fixing briquetting (6), wherein, semi-girder main part canned paragraph (2), semi-girder main part active section (3) and semi-girder main part loaded segment (4) are formed by an equal thickness plate, it is characterized in that: semi-girder main part active section (3) and semi-girder main part loaded segment (4) integrated board be shaped as isosceles triangle, its summit is the load(ing) point (7) on semi-girder main part loaded segment (4) top, the side of its two equilateral formation semi-girder main part active section (3) and semi-girder main part loaded segment (4) integrated board, its base is on semi-girder main part canned paragraph (2), and the base angle of this isoceles triangle shape is 83.16 °.
2. equi intensity cantilever according to claim 1 is characterized in that: semi-girder main part loaded segment (4) is parallel with dual-side is processed, and its top is a tack.
3. equi intensity cantilever according to claim 1 is characterized in that: vertical support floor (5) adopts vertical supporting way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201668147U CN201488709U (en) | 2009-07-20 | 2009-07-20 | Constant-strength cantilever beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201668147U CN201488709U (en) | 2009-07-20 | 2009-07-20 | Constant-strength cantilever beam |
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| CN201488709U true CN201488709U (en) | 2010-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009201668147U Expired - Fee Related CN201488709U (en) | 2009-07-20 | 2009-07-20 | Constant-strength cantilever beam |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792057A (en) * | 2014-03-10 | 2014-05-14 | 西安交通大学 | Adjustable gap nonlinear research test bed and use method thereof |
| CN106124801A (en) * | 2016-08-03 | 2016-11-16 | 常熟市浙大紫金光电技术研究中心 | Wind speed sensing device based on fiber grating and wind speed and direction monitoring system |
| CN107036543A (en) * | 2015-10-14 | 2017-08-11 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor demarcation and fatigue detecting system |
| CN111563300A (en) * | 2020-05-07 | 2020-08-21 | 湖南师范大学 | Rectangular cross-section equal-strength supporting beam with evenly distributed loads at intervals |
| CN114184494A (en) * | 2021-11-15 | 2022-03-15 | 山东省复材成型技术与装备研究院 | Bending test tool for carbon fiber winding cantilever beam |
| CN114337371A (en) * | 2021-12-23 | 2022-04-12 | 西安交通大学 | Equal strain gradient cantilever beam with variable longitudinal size |
-
2009
- 2009-07-20 CN CN2009201668147U patent/CN201488709U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103792057A (en) * | 2014-03-10 | 2014-05-14 | 西安交通大学 | Adjustable gap nonlinear research test bed and use method thereof |
| CN103792057B (en) * | 2014-03-10 | 2016-08-17 | 西安交通大学 | A kind of adjustable backlash nonlinearity development test platform and using method thereof |
| CN107036543A (en) * | 2015-10-14 | 2017-08-11 | 北京信息科技大学 | A kind of fiber Bragg grating strain sensor demarcation and fatigue detecting system |
| CN106124801A (en) * | 2016-08-03 | 2016-11-16 | 常熟市浙大紫金光电技术研究中心 | Wind speed sensing device based on fiber grating and wind speed and direction monitoring system |
| CN111563300A (en) * | 2020-05-07 | 2020-08-21 | 湖南师范大学 | Rectangular cross-section equal-strength supporting beam with evenly distributed loads at intervals |
| CN111563300B (en) * | 2020-05-07 | 2023-10-10 | 湖南师范大学 | Rectangular cross section equal strength supporting beam subjected to interval uniform load distribution |
| CN114184494A (en) * | 2021-11-15 | 2022-03-15 | 山东省复材成型技术与装备研究院 | Bending test tool for carbon fiber winding cantilever beam |
| CN114337371A (en) * | 2021-12-23 | 2022-04-12 | 西安交通大学 | Equal strain gradient cantilever beam with variable longitudinal size |
| CN114337371B (en) * | 2021-12-23 | 2024-03-12 | 西安交通大学 | Equal-strain gradient cantilever beam with longitudinal dimension changing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20150720 |
|
| EXPY | Termination of patent right or utility model |