CN113959830A - Bamboo and wood material biaxial tension test device and method - Google Patents
Bamboo and wood material biaxial tension test device and method Download PDFInfo
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- CN113959830A CN113959830A CN202111299479.XA CN202111299479A CN113959830A CN 113959830 A CN113959830 A CN 113959830A CN 202111299479 A CN202111299479 A CN 202111299479A CN 113959830 A CN113959830 A CN 113959830A
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- baffle
- plate
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- force sensor
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
Abstract
The invention discloses a bamboo and wood material biaxial tension test device and a method, comprising a frame force transmission device, a test piece fixing device and a loading device; different lateral tension forces are applied through the jack, a universal testing machine is used for loading the upper end of the steel base plate, for displacement loading control, the device can measure the strength change rules of the two under the combined stress action of biaxial tension coupling, and can perform loading tests on wood test pieces in different texture directions to realize a combined stress state under biaxial tension.
Description
Technical Field
The invention relates to the technical field of indoor loading tests of bamboo and wood materials, in particular to a device and a method for testing double-shaft tension of a bamboo and wood material.
Background
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 conducted intensive studies on mechanical properties of wood in a simple stressed state, studies on mechanical properties of wood in a complex stress state, particularly under a biaxial tensile stress coupling effect, are lacked, and specific test methods are not specified in relevant test standards. Therefore, it is necessary to provide a device capable of performing the biaxial tension test of the bamboo material.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for testing the biaxial tension of a bamboo material, wherein the device can be used for measuring the strength change rule of the biaxial tension coupled device under the composite stress effect.
In order to achieve the purpose, the invention adopts the technical scheme that:
a bamboo material biaxial tension test device comprises a frame force transfer device, a test piece fixing device and a loading device;
the frame force transmission device comprises a bottom plate 1 and baffle plates, the baffle plates comprise a first baffle plate 2 and a second baffle plate 3 which are parallel, the bottom plate 1 is horizontally placed, the first baffle plate 2 and the second baffle plate 3 are vertically arranged on the upper surface of the bottom plate 1, a screw rod 4 penetrates between the two baffle plates, and the screw rod 4 is perpendicular to the two baffle plates and is fixed by a screw cap 5;
the test piece fixing device comprises a wood test piece 6 positioned between a first baffle 2 and a second baffle 3, the front end, the rear end, the upper end and the lower end of the wood test piece 6 are respectively connected with one end of four rectangular steel base plates 7 through bolts, the middle parts of the steel base plates 7 are occluded with the groove of the wood test piece 6, the other ends of the steel base plates 7 positioned at the front end and the rear end are connected with a force sensor 9, and the bottom surfaces of the steel base plates 7 below are connected with a bottom plate 1 through ball foot shackles 8 through bolts;
the loading device comprises a first jack 10 arranged on the inner side of a first baffle plate 2 and a second jack 11 arranged on the inner side of a second baffle plate 3, the inner ends of the first jack 10 and the second jack 11 are respectively connected with a slidable third baffle plate 12 and a slidable fourth baffle plate 13, the bottom ends of the slidable third baffle plate 12 and the slidable fourth baffle plate 13 are connected with a bottom plate 1 through a reinforcing steel bar 14, the inner end of the slidable third baffle plate 12 is provided with a slidable fifth baffle plate 15, the inner end of the fourth baffle plate 13 is provided with a slidable sixth baffle plate 16, the slidable fifth baffle plate 15 and the slidable sixth baffle plate 16 are connected with a force sensor 9, the force sensor 9 is connected with a rectangular steel backing plate 7 at the front end and the rear end of a wood test piece 6, a screw rod 17 penetrates between the third baffle plate 12 and the sixth baffle plate 16, the screw rod 17 is vertical to the two baffle plates and is fixed by a nut 18, and the screw rod 17 penetrates between the fifth baffle plate 15 and the fourth baffle plate 13, the screw 17 is vertical to the two baffles and is fixed by a screw cap 18; the universal tester applies a tensile load to the upper end of the wooden test piece 6.
The bottom plate 1 and the baffle plates are steel plates.
The first baffle plate 2 and the second baffle plate 3 are respectively welded with the bottom plate 1.
The number of the screws 4 is two, and the screws respectively and symmetrically penetrate through the first baffle 2, the second baffle 3, the third baffle 12, the slidable fourth baffle 13, the slidable fifth baffle 15 and the slidable sixth baffle 16.
The rectangular steel base plate 7 is composed of a first steel base plate 19, a second steel base plate 20, a third steel base plate 21 and a fourth steel base plate 22, the force sensor 9 is divided into a first force sensor 23 and a second force sensor 24, the first steel base plate 19 is connected with the first force sensor 23, and the third steel base plate 21 is connected with the second force sensor 24.
A method for installing a biaxial tension test device for bamboo and wood materials comprises the following steps:
step 1: the front, the back, the upper and the lower ends of the wood test piece 6 are connected with four steel backing plates 7 by bolts;
step 2: connecting a first force sensor 23 with the first steel backing plate 19, and connecting a second force sensor 24 with the third steel backing plate 21;
and step 3: welding and connecting the bottom surface of a second steel base plate 20 at the lower part of the wood test piece 6 with the ball-foot handcuffs 8;
and 4, step 4: the bottom ends of the ball foot handcuffs 8 are connected with the bottom plate 1 through bolts;
and 5: the bottom ends of a third baffle plate 12, a fourth baffle plate 13, a fifth baffle plate 15 and a sixth baffle plate 16 are connected with the bottom plate 1 through a steel bar 14 in a sliding mode, a first steel backing plate 19 is connected with a first force sensor 23 through bolts, and a third steel backing plate 21 is connected with a second force sensor 24 through bolts;
step 6: respectively connecting the inner ends of the first jack 10 and the second jack 11 with a third baffle 12 and a fourth baffle 13;
and 7: the outer ends of the first jack 10 and the second jack 11 are respectively connected with the first baffle plate 2 and the second baffle plate 3;
and 8: a screw rod 4 penetrates between the first baffle plate 2 and the second baffle plate 3, and the screw rod 4 is perpendicular to the two baffle plates and is fixed by a screw cap 5;
and step 9: a screw rod 17 penetrates between the third baffle plate 12 and the sixth baffle plate 16, and the screw rod 17 is vertical to the two baffle plates and is fixed by a screw cap 18;
step 10: the screw 17 is penetrated between the fifth baffle 15 and the fourth baffle 13, and the screw 17 is vertical to the two baffles and fixed by a screw cap 18.
The invention has the beneficial effects that:
the bamboo and wood material biaxial tension test device is simple to operate and easy to realize in the construction process. The strength change rule can be measured under the composite stress effect of biaxial tension 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 in different texture directions, and the composite stress state under the biaxial tension is realized. Therefore, the change rule of the strength under the composite stress of the biaxial tension coupling is deduced.
Drawings
FIG. 1 is a front view of a biaxial tension test device for bamboo and wood materials.
FIG. 2 is a schematic diagram of a biaxial tension test device for bamboo and wood materials.
Detailed Description
The present invention will be described in further detail with reference to examples.
As shown in fig. 1 and 2: a bamboo and wood material biaxial tension test device comprises a frame force transfer device, a test piece fixing device and a loading device. The frame force transmission device consists of a steel plate, a screw rod and a nut; the test piece fixing device is composed of a wood test piece and steel backing plate ball feet handcuffs; the loading device comprises a jack, a universal testing machine, a force sensor, a steel plate, a screw rod, a screw cap and a steel bar.
The frame force transmission device comprises a steel plate, a screw rod 4 and a screw cap 5; the steel plate is divided into a bottom plate 1 and baffle plates, a first baffle plate 2 and a second baffle plate 3, wherein the first baffle plate 2 and the second baffle plate 3 are required to be marked in the drawing and are respectively welded with the bottom plate 1; the screw rods 4 are two screws with uniform specifications, and two baffle plates are respectively connected to the inner sides of two corners of the upper part of each baffle plate in a penetrating manner; the nuts 5 are fixed on four screws on the inner and outer sides of the first baffle plate 2 and the inner and outer sides of the third baffle plate 3.
The test piece fixing device comprises a wood test piece 6 and a steel base plate 7; the front end, the rear end, the upper end and the lower end of the wood test piece 6 are connected with four steel backing plates 7 through bolts, and the other ends of the steel backing plates 7 positioned at the front end and the rear end of the wood test piece are connected with a force sensor 9; the bottom surface of a steel base plate 7 at the lower part of the wood test piece 6 is welded with the ball-foot handcuffs 8; the bottom ends of the ball-foot handcuffs 8 are connected with the bottom plate 1 through bolts.
The loading device comprises a jack, a universal testing machine, a force sensor 9, a steel plate, a screw 17, a nut 18 and a steel bar 14; the outer ends of a first jack 10 and a second jack 11 are respectively connected with a first baffle 2 and a second baffle 3, the inner ends of the first jack 10 and the second jack 11 are respectively connected with a slidable third baffle 12 and a slidable fourth baffle 13, the bottom ends of the slidable third baffle 12 and the slidable fourth baffle 13 are connected with a bottom plate 1 through a reinforcing steel bar 14 and can slide, the inner ends of the slidable third baffle 12 and the slidable fourth baffle 13 are respectively provided with a slidable fifth baffle 15 and a slidable sixth baffle 16 which are consistent in shape and size, and the interior of the slidable fifth baffle 15 and the slidable sixth baffle 16 are connected with a force sensor 9; a screw 17 penetrates between the third baffle plate 12 and the sixth baffle plate 16, the screw 17 is perpendicular to the two baffle plates and fixed by a screw cap 18, the screw 17 penetrates between the fifth baffle plate 15 and the fourth baffle plate 13, and the screw 17 is perpendicular to the two baffle plates and fixed by the screw cap 18; the universal tester applies a load to the upper end of the wooden test piece 6.
The end part of the sample is a clamping part of a testing machine, the middle part of the sample is a pressed part, and the damage mechanism of the wood is revealed by measuring the failure mode, the strength and the deformation rule of the wood under the action of biaxial tensile stress through biaxial tension coupling loading tests in LR, LT and RT planes.
The installation step of the bamboo and wood material compression-shear test device comprises the following steps:
step 1: the front, the back, the upper and the lower ends of the wood test piece 6 are connected with four steel backing plates 7 by bolts;
step 2: connecting a first force sensor 23 with the first steel backing plate 19, and connecting a second force sensor 24 with the third steel backing plate 21;
and step 3: welding and connecting the bottom surface of a second steel base plate 20 at the lower part of the wood test piece 6 with the ball-foot handcuffs 8;
and 4, step 4: the bottom ends of the ball foot handcuffs 8 are connected with the bottom plate 1 through bolts;
and 5: the bottom ends of a third baffle plate 12, a fourth baffle plate 13, a fifth baffle plate 15 and a sixth baffle plate 16 are connected with the bottom plate 1 through a steel bar 14 in a sliding mode, a first steel backing plate 19 is connected with a first force sensor 23 through bolts, and a third steel backing plate 21 is connected with a second force sensor 24 through bolts;
step 6: respectively connecting the inner ends of the first jack 10 and the second jack 11 with a third baffle 12 and a fourth baffle 13;
and 7: the outer ends of the first jack 10 and the second jack 11 are respectively connected with the first baffle plate 2 and the second baffle plate 3;
and 8: a screw rod 4 penetrates between the first baffle plate 2 and the second baffle plate 3, and the screw rod 4 is perpendicular to the two baffle plates and is fixed by a screw cap 5;
and step 9: a screw rod 17 penetrates between the third baffle plate 12 and the sixth baffle plate 16, and the screw rod 17 is vertical to the two baffle plates and is fixed by a screw cap 18;
step 10: the screw 17 is penetrated between the fifth baffle 15 and the fourth baffle 13, and the screw 17 is vertical to the two baffles and fixed by a screw cap 18.
The above-mentioned biaxial compression testing device for bamboo and wood materials is only an exemplary embodiment, and the practice of the present invention is not limited thereto, and any non-inventive modification and deformation 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 tension is applied through the jack, a universal testing machine is adopted to load the upper end of the steel base plate 7, 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 (6)
1. A bamboo material biaxial tension 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 bottom plate (1) and baffles, the baffles comprise a first baffle (2) and a second baffle (3) which are parallel to each other, the bottom plate (1) is horizontally placed, the first baffle (2) and the second baffle (3) are vertically arranged on the upper surface of the bottom plate 1, a screw rod (4) penetrates between the two baffles, and the screw rod (4) is perpendicular to the two baffles and is fixed by a screw cap (5);
the test piece fixing device comprises a wood test piece (6) positioned between a first baffle (2) and a second baffle (3), the front end, the rear end, the upper end and the lower end of the wood test piece (6) are respectively connected with one end of four rectangular steel base plates (7) through bolts, the middle of each steel base plate (7) is meshed with a groove of the wood test piece (6), the other end of each steel base plate (7) positioned at the front end and the rear end is connected with a force sensor (9), and the bottom surface of the steel base plate (7) below is connected with a bottom plate (1) through ball foot shackles (8) through bolts;
the loading device comprises a first jack (10) arranged on the inner side of a first baffle (2) and a second jack (11) arranged on the inner side of a second baffle (3), the inner ends of the first jack (10) and the second jack (11) are respectively connected with a slidable third baffle (12) and a slidable fourth baffle (13), the bottom end of the slidable third baffle (12) and the bottom end of the slidable fourth baffle (13) are connected with a bottom plate (1) through a reinforcing steel bar (14), the inner end of the slidable third baffle (12) is provided with a slidable fifth baffle (15), the inner end of the fourth baffle (13) is provided with a slidable sixth baffle (16), the slidable fifth baffle (15) and the inner part of the slidable sixth baffle (16) are connected with a force sensor (9), the force sensor (9) is connected with a rectangular steel base plate (7) at the front end and the rear end of a wood test piece (6), a screw rod (17) penetrates between the third baffle plate (12) and the sixth baffle plate (16), the screw rod (17) is vertical to the two baffle plates and fixed by a screw cap (18), the screw rod (17) penetrates between the fifth baffle plate (15) and the fourth baffle plate (13), and the screw rod (17) is vertical to the two baffle plates and fixed by the screw cap (18); the universal testing machine applies tensile load to the upper end of the wooden test piece (6).
2. The biaxial tension test device for bamboo and wood materials as claimed in claim 1, characterized in that the bottom plate (1) and the baffle are steel plates.
3. The biaxial tension test device for bamboo and wood materials as claimed in claim 1, characterized in that the first baffle (2) and the second baffle (3) are welded with the bottom plate (1) respectively.
4. The biaxial tension test device for the bamboo and wood materials according to claim 1, characterized in that the number of the screws (4) is two, and the screws respectively and symmetrically penetrate through the first baffle (2), the second baffle (3), the third baffle (12), the slidable fourth baffle (13), the slidable fifth baffle (15) and the slidable sixth baffle (16).
5. The biaxial tension test device for bamboo and wood materials according to claim 1, characterized in that the rectangular steel backing plate (7) is a first steel backing plate (19), a second steel backing plate (20), a third steel backing plate (21) and a fourth steel backing plate (22), the force sensor (9) is divided into a first force sensor (23) and a second force sensor (24), the first steel backing plate (19) is connected with the first force sensor (23), and the third steel backing plate (21) is connected with the second force sensor (24).
6. The method for installing the biaxial tension test device for the bamboo and wood materials according to any one of claims 1 to 5 is characterized by comprising the following steps of:
step 1: the front, the back, the upper and the lower ends of the wood test piece (6) are connected with four steel base plates (7) by bolts;
step 2: connecting a first force sensor (23) with a first steel backing plate (19), and connecting a second force sensor (24) with a third steel backing plate (21);
and step 3: welding and connecting the bottom surface of a second steel base plate (20) at the lower part of the wood test piece (6) with the ball-foot cuffs (8);
and 4, step 4: the bottom ends of the ball foot handcuffs (8) are connected with the bottom plate (1) through bolts;
and 5: connecting the bottom ends of a third baffle plate (12), a fourth baffle plate (13), a fifth baffle plate (15) and a sixth baffle plate (16) with a bottom plate (1) through a steel bar (14) in a sliding manner, connecting a first steel backing plate (19) with a first force sensor (23) through a bolt, and connecting a third steel backing plate (21) with a second force sensor (24) through a bolt;
step 6: respectively connecting the inner ends of the first jack (10) and the second jack (11) with a third baffle plate (12) and a fourth baffle plate (13);
and 7: the outer ends of the first jack (10) and the second jack (11) are respectively connected with the first baffle (2) and the second baffle (3);
and 8: a screw rod (4) penetrates between the first baffle plate (2) and the second baffle plate (3), and the screw rod (4) is vertical to the two baffle plates and is fixed by a screw cap (5);
and step 9: a screw rod (17) penetrates between the third baffle plate (12) and the sixth baffle plate (16), and the screw rod (17) is vertical to the two baffle plates and is fixed by a screw cap (18);
step 10: and (3) penetrating a screw (17) between the fifth baffle (15) and the fourth baffle (13), wherein the screw (17) is vertical to the two baffles and is fixed by a screw cap (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111299479.XA CN113959830A (en) | 2021-11-04 | 2021-11-04 | Bamboo and wood material biaxial tension test device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111299479.XA CN113959830A (en) | 2021-11-04 | 2021-11-04 | Bamboo and wood material biaxial tension test device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113959830A true CN113959830A (en) | 2022-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111299479.XA Pending CN113959830A (en) | 2021-11-04 | 2021-11-04 | Bamboo and wood material biaxial tension test device and method |
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| CN (1) | CN113959830A (en) |
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