CN113358495A - Bamboo wood material presses-cuts test device - Google Patents
Bamboo wood material presses-cuts test device Download PDFInfo
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- CN113358495A CN113358495A CN202110632577.4A CN202110632577A CN113358495A CN 113358495 A CN113358495 A CN 113358495A CN 202110632577 A CN202110632577 A CN 202110632577A CN 113358495 A CN113358495 A CN 113358495A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
A bamboo material compression-shear test device and a method belong to the technical field of indoor loading tests, the test device is divided into three parts, and comprises a frame force transfer device, a test piece fixing device and a loading device, wherein the frame force transfer device, the test piece fixing device and the loading device are composed of a steel plate, a steel bar, a screw rod, a nut cap, a steel support, a wood test piece, an L-shaped steel clamping plate, a rectangular steel cushion block, a force sensor, a columnar steel block, a slide rail combination and a jack; the invention designs a loading frame and a test piece fixing device with a brand new structure, improves the integral rigidity of the device, ensures the stress state of a test piece in the double-shaft compression shearing process, and can measure more accurate shear strength by the test piece fixing device.
Description
Technical Field
The invention relates to the technical field of indoor loading tests of bamboo and wood materials, in particular to a compression-shear test device for bamboo and wood materials.
Background
Bamboo and wood materials are one of the earliest building materials used by human beings and are also important material bases of modern wood structure buildings. However, the wood has various types, belongs to porous discontinuous natural plant materials, is in different environments, grows unevenly and the like, so that the structure is complex, and the mechanical property shows high anisotropy.
The mechanical behavior difference of the wood on different texture surfaces, different loading directions and different fiber angles is obvious. In recent years, although many researchers have intensively studied the mechanical properties of wood in a simple stressed state, the studies on the mechanical properties of wood in a complex stress state, particularly under the coupling action of compression-shear stress, are lacked, and specific test methods are not clarified in relevant test standards. Therefore, it is necessary to provide a device capable of performing a compression shear test of bamboo and wood materials.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a bamboo material compression-shear test device, and the method can be used for measuring the strength change rule of the compression and shear materials under the combined stress action of compression and shear coupling.
In order to achieve the purpose, the invention adopts the technical scheme that:
a bamboo material compression-shear test device comprises a frame force transfer device, a test piece fixing device and a loading device;
the frame force transmission device comprises a steel plate 1, the steel plate 1 is divided into a pressing plate and a baffle plate, the pressing plate comprises a horizontal bottom plate 13 at the bottom and a horizontal upper pressing plate 14 above the bottom, a vertical first baffle plate 15, a vertical second baffle plate 16 and a vertical third baffle plate 17 are arranged on the upper surface of the bottom plate 13, the first baffle plate 15 and the third baffle plate 17 are respectively welded with the bottom plate 13, and the second baffle plate 16 and the bottom plate 13 are connected through a horizontal steel bar 2 and can slide; a screw 3 penetrates through the three baffles, and the screw 3 is vertical to the three baffles;
the test piece fixing device comprises a wood test piece 6 positioned between a first baffle 15 and a second baffle 16, the front end and the rear end of the wood test piece 6 are connected with two 'L-shaped' steel clamping plates 8 through bolts, the end faces of the front end and the rear end of the wood test piece 6 are bonded with two 'rectangular' steel cushion blocks 8, the 'rectangular' steel cushion block 8 at one end is connected with a force sensor 9, the top of one 'L-shaped' steel clamping plate 8 and the bottom of the other 'L-shaped' steel clamping plate 8 are respectively provided with a columnar steel block 10, the columnar steel block 10 is connected with a slide rail combination 11, and the top of the slide rail combination 11 above the columnar steel block is provided with an upper pressure plate 14;
the loading device comprises a jack 12, wherein the jack 12 is connected with the inner side of a first baffle 15 and the outer side of a second baffle 16 and is level with the center of the wood test piece 6.
The screw rods 3 are fixed through screw caps 4, and the screw caps 4 are fixed on the four screw rods 3 on the inner side and the outer side of the first baffle plate 15 and the inner side and the outer side of the third baffle plate 17.
The steel support 5 is welded on the outer side of the first baffle plate 15 and the upper surface of the bottom plate 13, and the steel support 5 is welded on the outer side of the third baffle plate 17 and the upper surface of the bottom plate 13.
The L-shaped steel splint 8 is divided into a first splint and a second splint; the rectangular steel cushion block 8 is a first cushion block 18 and a second cushion block 19, the columnar steel block 10 is divided into a first steel block and a second steel block, the first steel block is connected with the L-shaped first cushion block 18, and the second steel block is connected with the L-shaped second cushion block 19 and the center of the bottom surface; slide rail combination 11 divides into first slide rail combination 20, second slide rail combination 21, third slide rail combination 22, and first slide rail combination 20 meets with first steel billet, and second slide rail combination 21 meets with the second steel billet, and third slide rail combination 22 and force sensor 9 are with bolted connection.
The installation step of the bamboo and wood material compression-shear test device comprises the following steps:
step 1: the front end and the rear end of a wood test piece 6 are connected with a pair of L-shaped steel cushion blocks 7 through bolts;
step 2: bonding the left end and the right end of the wood test piece 6 with a pair of rectangular steel cushion blocks 8;
and step 3: the force sensor 9 is connected with a first rectangular cushion block 18 at the inner side;
and 4, step 4: respectively connecting the first steel block and the second steel block with the centers of the bottom surfaces of the L-shaped first cushion block 18 and the L-shaped second cushion block 19;
and 5: connecting a first slide rail combination 20 with a first steel block, connecting a second slide rail combination 21 with a second steel block, and connecting a third slide rail combination 22 with a sensor 9 through a bolt;
step 6: respectively welding a first baffle plate 15 and a third baffle plate 17 with a bottom plate 13, and connecting a second baffle plate 16 and the bottom plate 13 by using a steel bar 2 to enable the second baffle plate to slide;
and 7: respectively connecting three baffles with the screw rods 3 at the inner sides of the four corners of the baffles;
and 8: the nuts 4 are fixed on four screws inside and outside the first baffle 15 and inside and outside the third baffle 17:
and step 9: welding the first support with the outer side of the first baffle plate 15 and the upper surface of the bottom plate 13, and welding the second support with the outer side of the third baffle plate 17 and the upper surface of the bottom plate 13;
step 10: and (3) bonding the first slide rail with an upper pressing plate 14, bonding the second slide rail with a second baffle plate 16, bonding the third slide rail with a bottom plate 13, and bonding the steel cushion block with a third baffle plate 17.
The invention has the beneficial effects that:
the bamboo and wood material compression-shear test device is simple to operate and easy to realize in the construction process. The strength change rule of the two can be measured under the combined stress action of pressure and shear coupling.
The method has clear structure, simple operation and easy realization in the construction process. The loading test can be carried out on the wood test pieces with different grain directions, and the wood shear strength under different lateral pressures can be measured. The influence of the positive stress of the shearing surface can be eliminated, a pure shearing stress state is obtained in the test, and a more accurate measurement value is provided. Therefore, the change rule of the strength of the two under the combined stress action of the pressure and the shear coupling is deduced.
Drawings
FIG. 1 is a front view of a bamboo and wood material compression-shear test device.
Fig. 2 is a schematic diagram of a bamboo-wood material compression-shear test device.
FIG. 3 is a schematic view of a loading test.
Detailed Description
The present invention will be described in further detail with reference to examples.
A bamboo and wood material compression-shear test device is characterized by comprising a frame force transmission device, a test piece fixing device and a loading device. The frame force transmission device consists of a steel plate, a steel bar, a screw rod, a screw cap and a steel support; the test piece fixing device is composed of a wood test piece, an L-shaped steel clamping plate, a rectangular steel cushion block, a force sensor, a columnar steel block and a slide rail; the loading device is a jack and a universal testing machine.
The frame force transmission device comprises a steel plate 1, a steel bar 2, a screw rod 3, a screw cap 4 and a steel support 5; the steel plate 1 is divided into a pressing plate and a baffle plate, an upper pressing plate 14, a bottom plate 13, a first baffle plate 15, a second baffle plate 16 and a third baffle plate 17, wherein the first baffle plate 15 and the third baffle plate 17 are required to be marked in the drawing and are respectively welded with the bottom plate 13, and the second baffle plate 16 and the bottom plate 13 are connected by a steel bar 2 and can slide; the screw rods 3 are four screw rods with uniform specifications, and three baffles are respectively connected to the inner sides of the four corners of each baffle in a penetrating manner; the screw caps 4 are fixed on four screw rods on the inner side and the outer side of the first baffle plate 15 and the inner side and the outer side of the third baffle plate 17; and the steel support 5 is divided into a first support and a second support, the first support is welded with the outer side of the first baffle plate 15 and the upper surface of the bottom plate 13, and the second support is welded with the outer side of the third baffle plate 17 and the upper surface of the bottom plate 13.
The test piece fixing device comprises a wood test piece 6, an L-shaped steel clamping plate 7, a rectangular steel cushion block 8, a force sensor 9, a columnar steel block 10 and a slide rail combination 11; the L-shaped steel clamping plate 8 is divided into a first clamping plate and a second clamping plate which are respectively connected with the front end and the rear end of the wood test piece 6 through bolts; the rectangular steel cushion blocks 8 are a first cushion block 18 and a second cushion block 19 which are respectively bonded with the front end and the rear end of the wood test piece 6; the force sensor 9 is connected to a "rectangular" first pad 188; the columnar steel block 10 is divided into a first steel block and a second steel block which are respectively connected with an L-shaped first cushion block 18, an L-shaped second cushion block 19 and the center of the bottom surface; slide rail combination 11 divides into first slide rail combination 20, second slide rail combination 21, third slide rail combination 22, and first slide rail combination 20 meets with first steel billet, and second slide rail combination 21 meets with the second steel billet, and third slide rail combination 22 and force sensor 9 are with bolted connection.
The loading device is a jack 12, and the jack 12 is connected with the inner side of the first baffle 15 and the outer side of the second baffle 16 and is level with the center of the wood test piece 6.
The frame force transfer device is connected with the test piece fixing device in a mode that a first slide rail is bonded with an upper pressure plate 14, a second slide rail is bonded with a second baffle plate 16, a third slide rail is bonded with a bottom plate 13, and a rectangular steel cushion block 8 is bonded with a third baffle plate 17.
As shown in fig. 3: the end part of the sample is a clamping part of a testing machine, the middle part of the sample is a pressed and pure shearing part, and the damage mode, the strength and the deformation rule of the wood under the action of the compression-shear stress are measured through a normal stress and shear stress coupling loading test in LR, LT and RT planes, so that the damage mechanism of the wood is disclosed.
The installation step of the bamboo and wood material compression-shear test device comprises the following steps:
step 1: the front end and the rear end of a wood test piece 6 are connected with a pair of L-shaped steel cushion blocks 7 through bolts;
step 2: bonding the left end and the right end of the wood test piece 6 with a pair of rectangular steel cushion blocks 8;
and step 3: the force sensor 9 is connected with a first rectangular cushion block 18 at the inner side;
and 4, step 4: respectively connecting the first steel block and the second steel block with the centers of the bottom surfaces of the L-shaped first cushion block 18 and the L-shaped second cushion block 19;
and 5: connecting a first slide rail combination 20 with a first steel block, connecting a second slide rail combination 21 with a second steel block, and connecting a third slide rail combination 22 with a sensor 9 through a bolt;
step 6: respectively welding a first baffle plate 15 and a third baffle plate 17 with a bottom plate 13, and connecting a second baffle plate 16 and the bottom plate 13 by using a steel bar 2 to enable the second baffle plate to slide;
and 7: respectively connecting three baffles with the screw rods 3 at the inner sides of the four corners of the baffles;
and 8: the nuts 4 are fixed on four screws inside and outside the first baffle 15 and inside and outside the third baffle 17:
and step 9: welding the first support with the outer side of the first baffle plate 15 and the upper surface of the bottom plate 13, and welding the second support with the outer side of the third baffle plate 17 and the upper surface of the bottom plate 13;
step 10: and (3) bonding the first slide rail with an upper pressing plate 14, bonding the second slide rail with a second baffle plate 16, bonding the third slide rail with a bottom plate 13, and bonding the steel cushion block with a third baffle plate 17.
The bamboo and wood material compression-shear test device described above is only an exemplary embodiment, and the implementation of the present invention is not limited thereto, and any non-inventive modification and variation based on the present solution are still within the protection scope of the present invention.
The working principle of the invention is as follows:
different lateral normal stresses are applied through the jack 12, a universal testing machine is adopted to load the upper pressing plate 141, for displacement loading control, a manual control mode is adopted in the test, and the loading rate is 2.0 mm/m. One person is required to strictly control the jack, and the other person is required to control the testing machine to carry out loading and unloading operations according to the strain or displacement information of the effective section.
Claims (5)
1. A bamboo material compression-shear test device is characterized by comprising a frame force transfer device, a test piece fixing device and a loading device;
the frame force transmission device comprises a steel plate (1), the steel plate (1) is divided into a pressing plate and a baffle plate, the pressing plate comprises a horizontal bottom plate (13) at the bottom and a horizontal upper pressing plate (14) above the bottom, a vertical first baffle plate (15), a vertical second baffle plate (16) and a vertical third baffle plate (17) are arranged on the upper surface of the bottom plate (13), the first baffle plate (15) and the third baffle plate (17) are respectively welded with the bottom plate (13), and the second baffle plate (16) is connected with the bottom plate (13) through a horizontal steel bar (2) in a sliding manner; a screw (3) penetrates through the three baffles, and the screw (3) is vertical to the three baffles;
the test piece fixing device comprises a wood test piece (6) positioned between a first baffle (15) and a second baffle (16), the front end and the rear end of the wood test piece (6) are connected with two L-shaped steel clamping plates (8) through bolts, the end faces of the front end and the rear end of the wood test piece (6) are bonded with rectangular steel cushion blocks (8), the rectangular steel cushion block (8) at one end is connected with a force sensor (9), the top of one L-shaped steel clamping plate (8) and the bottom of the other L-shaped steel clamping plate (8) are respectively provided with a columnar steel block (10), the columnar steel block (10) is connected with a sliding rail combination (11), and the top of the sliding rail combination (11) above is provided with an upper pressing plate (14);
the loading device comprises a jack (12), wherein the jack (12) is connected with the inner side of the first baffle (15) and the outer side of the second baffle (16) and is level to the center of the wood test piece (6).
2. The bamboo-wood material compression-shear test device of claim 1, wherein the screws (3) are fixed by nuts (4), and the nuts (4) are fixed on the four screws (3) inside and outside the first baffle (15) and inside and outside the third baffle (17).
3. The bamboo-wood material compression-shear test device of claim 1, wherein the steel support (5) is welded on the outer side of the first baffle plate (15) and the upper surface of the base plate (13), and the steel support (5) is welded on the outer side of the third baffle plate (17) and the upper surface of the base plate (13).
4. The bamboo-wood material compression-shear test device according to claim 1, wherein the L-shaped steel clamping plate (8) is divided into a first clamping plate and a second clamping plate; the rectangular steel cushion block (8) is a first cushion block (18) and a second cushion block (19), the columnar steel block (10) is divided into a first steel block and a second steel block, the first steel block is connected with the L-shaped first cushion block (18), and the second steel block is connected with the L-shaped second cushion block (19) and the center of the bottom surface; slide rail combination (11) divide into first slide rail combination (20), second slide rail combination (21), third slide rail combination (22), and first slide rail combination (20) meet with first steel billet, and second slide rail combination (21) meet with the second steel billet, and bolted connection is used with force sensor (9) in third slide rail combination (22).
5. The mounting step of the bamboo-wood material compression-shear test device based on any one of claims 1 to 4 is characterized by comprising the following steps:
step 1: the front end and the rear end of the wood test piece (6) are connected with a pair of L-shaped steel cushion blocks (7) through bolts;
step 2: bonding the left end and the right end of the wood test piece (6) with a pair of rectangular steel cushion blocks (8);
and step 3: connecting a force sensor (9) with a rectangular first cushion block (18) on the inner side;
and 4, step 4: respectively connecting the first steel block and the second steel block with the centers of the bottom surfaces of the L-shaped first cushion block (18) and the L-shaped second cushion block (19);
and 5: connecting a first slide rail combination (20) with a first steel block, connecting a second slide rail combination (21) with a second steel block, and connecting a third slide rail combination (22) with a sensor (9) through bolts;
step 6: respectively welding the first baffle (15) and the third baffle (17) with the bottom plate (13), and connecting the second baffle (16) and the bottom plate (13) by using a steel bar (2) in a sliding manner;
and 7: three baffles are respectively connected with the screw rods (3) at the inner sides of the four corners of the baffles in a penetrating manner;
and 8: the nuts (4) are fixed on four screw rods on the inner side and the outer side of the first baffle plate (15) and the inner side and the outer side of the third baffle plate (17):
and step 9: welding the first support with the outer side of the first baffle plate (15) and the upper surface of the bottom plate (13), and welding the second support with the outer side of the third baffle plate (17) and the upper surface of the bottom plate (13);
step 10: and the first slide rail is bonded with the upper pressing plate (14), the second slide rail is bonded with the second baffle plate (16), the third slide rail is bonded with the bottom plate (13), and the steel cushion block is bonded with the third baffle plate (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110632577.4A CN113358495B (en) | 2021-06-07 | 2021-06-07 | Bamboo material presses-cuts test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110632577.4A CN113358495B (en) | 2021-06-07 | 2021-06-07 | Bamboo material presses-cuts test device |
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| Publication Number | Publication Date |
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| CN113358495A true CN113358495A (en) | 2021-09-07 |
| CN113358495B CN113358495B (en) | 2023-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110632577.4A Active CN113358495B (en) | 2021-06-07 | 2021-06-07 | Bamboo material presses-cuts test device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419143A (en) * | 2008-11-21 | 2009-04-29 | 同济大学 | Bidirectional composite force loading test device for masonry test piece |
| CN103048264A (en) * | 2013-01-22 | 2013-04-17 | 江苏华通工程检测有限公司 | Anchorage performance detection testing apparatus and method for carbon fiber adhesion reinforcement |
| CN111103205A (en) * | 2020-01-03 | 2020-05-05 | 西安建筑科技大学 | Shear test device and method for testing adhesive property of adhesive/steel interface |
| WO2021004015A1 (en) * | 2019-07-05 | 2021-01-14 | 山东科技大学 | Bolt (cable) support structure test, and anchoring system performance comprehensive testing device and method |
-
2021
- 2021-06-07 CN CN202110632577.4A patent/CN113358495B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419143A (en) * | 2008-11-21 | 2009-04-29 | 同济大学 | Bidirectional composite force loading test device for masonry test piece |
| CN103048264A (en) * | 2013-01-22 | 2013-04-17 | 江苏华通工程检测有限公司 | Anchorage performance detection testing apparatus and method for carbon fiber adhesion reinforcement |
| WO2021004015A1 (en) * | 2019-07-05 | 2021-01-14 | 山东科技大学 | Bolt (cable) support structure test, and anchoring system performance comprehensive testing device and method |
| CN111103205A (en) * | 2020-01-03 | 2020-05-05 | 西安建筑科技大学 | Shear test device and method for testing adhesive property of adhesive/steel interface |
Non-Patent Citations (1)
| Title |
|---|
| 杜强;丁荣;吕晶;陈一秀;: "复合板材双剪切试验方法与装置", 长安大学学报(自然科学版), no. 06 * |
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| CN113358495B (en) | 2023-06-30 |
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