CN113358495B - Bamboo material presses-cuts test device - Google Patents
Bamboo material presses-cuts test device Download PDFInfo
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- CN113358495B CN113358495B CN202110632577.4A CN202110632577A CN113358495B CN 113358495 B CN113358495 B CN 113358495B CN 202110632577 A CN202110632577 A CN 202110632577A CN 113358495 B CN113358495 B CN 113358495B
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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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Abstract
A bamboo material pressing-shearing test device and method belong to the technical field of indoor loading tests, the test device is divided into three parts, including a frame force transmission device, a test piece fixing device and a loading device, and the device consists of a steel plate, a steel bar, a screw, a nut, 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 the loading frame and the test piece fixing device with brand new structures, which can improve the overall rigidity of the device and ensure the stress state of the test piece in the biaxial pressing and shearing process, and the test piece fixing device can measure more accurate shear strength.
Description
Technical Field
The invention relates to the technical field of indoor loading tests of bamboo materials, in particular to a bamboo material pressing-shearing test device.
Background
Bamboo wood material is one of the earliest building materials used by human beings and is also an important material foundation of modern wood structure building. However, due to various wood species, the wood belongs to porous discontinuous natural plant materials, different environments, uneven growth and other factors, so that the wood has complex structure and structure, and the mechanical property shows high anisotropy.
The mechanical behavior difference of the wood is obvious under different texture surfaces, different loading directions and different fiber angles. In recent years, although many students have conducted intensive researches on mechanical properties of wood in a simple stress state, researches on mechanical properties of wood in a complex stress state, particularly under a compression-shear stress coupling effect are lacking, and specific test methods are not explicitly specified in related test standards. Therefore, it is necessary to provide a device capable of performing the bamboo material compression shear test.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a bamboo material compression-shear test device which can determine the intensity change rule of the two under the action of the composite stress of the compression force and the shear force coupling.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a bamboo material compression-shear test device comprises a frame force transmission device, a test piece fixing device and a loading device;
the frame force transmission device comprises a steel plate 1, wherein 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 plate, 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 and can slide; screw rods 3 penetrate through the three baffles, and the screw rods 3 are perpendicular 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, wherein 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 adhered 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 blocks 10 are connected with a slide rail combination 11, and the top of the slide 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 about to be leveled 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 supports 5 are welded on the outer side of the first baffle 15 and the upper surface of the bottom plate 13, and the steel supports 5 are welded on the outer side of the third baffle 17 and the upper surface of the bottom plate 13.
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; the sliding rail combination 11 is divided into a first sliding rail combination 20, a second sliding rail combination 21 and a third sliding rail combination 22, wherein the first sliding rail combination 20 is connected with a first steel block, the second sliding rail combination 21 is connected with a second steel block, and the third sliding rail combination 22 is connected with the force sensor 9 through bolts.
The mounting step of the bamboo 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 by bolts;
step 2: bonding the left and right ends of the wood test piece 6 with a pair of rectangular steel cushion blocks 8;
step 3: connecting the force sensor 9 with an inner "rectangular" first pad 18;
step 4: the first steel block and the second steel block are respectively connected with the centers of the bottoms of the L-shaped first cushion block 18 and the L-shaped second cushion block 19;
step 5: the first slide rail combination 20 is connected with a first steel block, the second slide rail combination 21 is connected with a second steel block, and the third slide rail combination 22 is connected with the sensor 9 by bolts;
step 6: the first baffle 15 and the third baffle 17 are respectively welded with the bottom plate 13, and the second baffle 16 is connected with the bottom plate 13 by the steel bars 2 and can slide;
step 7: the screw 3 is respectively penetrated and connected with three baffles at the inner sides of four corners of the baffles;
step 8: the nuts 4 are fixed on four screws inside and outside the first baffle 15 and inside and outside the third baffle 17:
step 9: welding the first support with the outer side of the first baffle 15 and the upper surface of the bottom plate 13, and welding the second support with the outer side of the third baffle 17 and the upper surface of the bottom plate 13;
step 10: the first slide rail is bonded with the upper pressing plate 14, the second slide rail is bonded with the second baffle 16, the third slide rail is bonded with the bottom plate 13, and the steel cushion block is bonded with the third baffle 17.
The invention has the beneficial effects that:
the bamboo material compression-shearing test device is simple to operate and easy to realize in the construction process. The change rule of the strength of the pressure and the shear force can be measured under the combined stress action of the pressure and the shear force coupling.
The method has clear structure, simple operation and easy realization in the construction process. The test piece can be loaded on wood test pieces with different grain directions, and the shear strength of the wood under different lateral pressures can be measured. The method can eliminate the influence of positive stress on the shearing surface, obtain a pure shearing stress state in the test and provide a more accurate measurement value. Thereby deducing the change rule of the strength of the pressure and the shear coupling under the action of the composite stress of the pressure and the shear coupling.
Drawings
Fig. 1 is a front view of a bamboo material compression-shear test apparatus.
Fig. 2 is a schematic diagram of a press-shear test device for bamboo materials.
FIG. 3 is a schematic diagram of a loading test.
Detailed Description
The invention is described in further detail below in connection with the practice.
A bamboo 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 sliding 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 3, a nut 4 and a steel support 5; the steel plate 1 is divided into a pressing plate, a baffle plate, an upper pressing plate 14 and 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 respectively welded with the bottom plate 13 in the drawing, and the second baffle plate 16 is connected with the bottom plate 13 by a steel bar 2 and can slide; the screw 3 is four screws with uniform specification, and three baffles are respectively penetrated and connected at the inner sides of four corners of the baffles; the nuts 4 are fixed on four screws on the inner side and the outer side of the first baffle 15 and the inner side and the outer side of the third baffle 17; the steel support 5 is divided into a first support and a second support, wherein the first support is welded with the outer side of the first baffle 15 and the upper surface of the bottom plate 13, and the second support is welded with the outer side of the third baffle 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 sliding rail combination 11; the L-shaped steel clamping plate 8 is divided into a first clamping plate and a second clamping plate, and is respectively connected with the front end and the rear end of the wood test piece 6 through bolts; the rectangular steel cushion block 8 is 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 block 188; the columnar steel block 10 is divided into a first steel block and a second steel block, and is respectively connected with an L-shaped first cushion block 18, an L-shaped second cushion block 19 and the center of the bottom surface; the sliding rail combination 11 is divided into a first sliding rail combination 20, a second sliding rail combination 21 and a third sliding rail combination 22, wherein the first sliding rail combination 20 is connected with a first steel block, the second sliding rail combination 21 is connected with a second steel block, and the third sliding rail combination 22 is connected with the force sensor 9 through bolts.
The loading device is provided with a jack 12, the jack 12 is connected with the inner side of the first baffle 15 and the outer side of the second baffle 16, and the jack is leveled with the center of the wood test piece 6.
The frame force transfer device is connected with the test piece fixing device, the first sliding rail is bonded with the upper pressing plate 14, the second sliding rail is bonded with the second baffle 16, the third sliding rail is bonded with the bottom plate 13, and the rectangular steel cushion block 8 is bonded with the third baffle 17.
As shown in fig. 3: the end part of the sample is a clamping part of the tester, the middle part is a pressed and pure shearing part, and the damage mode, strength and deformation rule of the wood under the action of the pressing-shearing stress are measured through the positive stress and shearing stress coupling loading test in the LR, LT and RT planes, so that the damage mechanism of the wood is revealed.
The mounting step of the bamboo 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 by bolts;
step 2: bonding the left and right ends of the wood test piece 6 with a pair of rectangular steel cushion blocks 8;
step 3: connecting the force sensor 9 with an inner "rectangular" first pad 18;
step 4: the first steel block and the second steel block are respectively connected with the centers of the bottoms of the L-shaped first cushion block 18 and the L-shaped second cushion block 19;
step 5: the first slide rail combination 20 is connected with a first steel block, the second slide rail combination 21 is connected with a second steel block, and the third slide rail combination 22 is connected with the sensor 9 by bolts;
step 6: the first baffle 15 and the third baffle 17 are respectively welded with the bottom plate 13, and the second baffle 16 is connected with the bottom plate 13 by the steel bars 2 and can slide;
step 7: the screw 3 is respectively penetrated and connected with three baffles at the inner sides of four corners of the baffles;
step 8: the nuts 4 are fixed on four screws inside and outside the first baffle 15 and inside and outside the third baffle 17:
step 9: welding the first support with the outer side of the first baffle 15 and the upper surface of the bottom plate 13, and welding the second support with the outer side of the third baffle 17 and the upper surface of the bottom plate 13;
step 10: the first slide rail is bonded with the upper pressing plate 14, the second slide rail is bonded with the second baffle 16, the third slide rail is bonded with the bottom plate 13, and the steel cushion block is bonded with the third baffle 17.
The above-mentioned press-shear test device for bamboo and wood materials is only an exemplary embodiment, and the implementation of the invention is not limited thereto, and any non-inventive modifications and variations based on the present solution are still within the scope of the invention.
The working principle of the invention is as follows:
different lateral normal stresses are applied through the jack 12, and the upper pressing plate 141 is loaded by a universal testing machine, so that displacement loading control is realized, and the test is performed in a manual control mode, wherein the loading rate is 2.0mm/m. One person is required to strictly control the jack, and one person controls the testing machine, so that loading and unloading operations are performed according to strain or displacement information of the effective section.
Claims (5)
1. The bamboo material compression-shearing 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 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 plate, a vertical first baffle (15), a vertical second baffle (16) and a vertical third baffle (17) are arranged on the upper surface of the bottom plate (13), the first baffle (15) and the third baffle (17) are respectively welded with the bottom plate (13), and the second baffle (16) is connected with the bottom plate (13) through horizontal steel bars (2) and can slide; screw rods (3) penetrate through the three baffles, and the screw rods (3) are perpendicular 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), wherein 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 front end face and the rear end face of the wood test piece (6) are adhered with rectangular steel cushion blocks (8), the rectangular steel cushion blocks (8) at one end are 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 blocks (10) are 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 leveled with the center of the wood test piece (6).
2. The bamboo material pressing-shearing test device according to claim 1, wherein the screw rods (3) are fixed through screw caps (4), and the screw caps (4) are fixed on 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).
3. The bamboo material pressing-shearing test device according to claim 1, wherein the outer side of the first baffle plate (15) and the upper surface of the bottom plate (13) are welded with steel supports (5), and the outer side of the third baffle plate (17) and the upper surface of the bottom plate (13) are welded with steel supports (5).
4. The bamboo material compression-shearing 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; the sliding rail combination (11) is divided into a first sliding rail combination (20), a second sliding rail combination (21) and a third sliding rail combination (22), the first sliding rail combination (20) is connected with the first steel block, the second sliding rail combination (21) is connected with the second steel block, and the third sliding rail combination (22) is connected with the force sensor (9) through bolts.
5. The method for installing the bamboo material compression-shear test device according to any one of claims 1 to 4, comprising the steps of:
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 a wood test piece (6) with a pair of rectangular steel cushion blocks (8);
step 3: connecting the force sensor (9) with a first cushion block (18) with a rectangular shape on the inner side;
step 4: the first steel block and the second steel block are respectively connected with the centers of the bottoms of the L-shaped first cushion block (18) and the L-shaped second cushion block (19);
step 5: the first sliding rail combination (20) is connected with the first steel block, the second sliding rail combination (21) is connected with the second steel block, and the third sliding rail combination (22) is connected with the sensor (9) through bolts;
step 6: the first baffle (15) and the third baffle (17) are respectively welded with the bottom plate (13), and the second baffle (16) is connected with the bottom plate (13) by the steel bars (2) and can slide;
step 7: the screw rods (3) are respectively penetrated and connected with three baffle plates at the inner sides of four corners of the baffle plates;
step 8: the screw cap (4) is fixed on four screws of 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):
step 9: welding the first support with the outer side of the first baffle (15) and the upper surface of the bottom plate (13), and welding the second support with the outer side of the third baffle (17) and the upper surface of the bottom plate (13);
step 10: the first slide rail is bonded with the upper pressing plate (14), the second slide rail is bonded with the second baffle (16), the third slide rail is bonded with the bottom plate (13), and the steel cushion block is bonded with the third baffle (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 |
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| 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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| CN113358495A CN113358495A (en) | 2021-09-07 |
| CN113358495B true CN113358495B (en) | 2023-06-30 |
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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 |
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| 复合板材双剪切试验方法与装置;杜强;丁荣;吕晶;陈一秀;;长安大学学报(自然科学版)(第06期);全文 * |
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