CN210626206U

CN210626206U - Tension-torsion composite extensometer suitable for plate-shaped sample

Info

Publication number: CN210626206U
Application number: CN201921609529.8U
Authority: CN
Inventors: 李世超; 方宇明; 高旭东; 郭松楠; 周水龙
Original assignee: Jilin University
Current assignee: Jilin University
Priority date: 2019-09-26
Filing date: 2019-09-26
Publication date: 2020-05-26
Anticipated expiration: 2029-09-26

Abstract

The utility model relates to a draw and turn round compound extensometer suitable for plate sample belongs to precision sensor and precision instrument technical field. The tensile deformation and the torsional deformation of the sample can be measured simultaneously. The utility model discloses mainly constitute by quiet arm part, swing arm part and base subassembly isotructure. The bottom table assembly plays a supporting role for the whole extensometer, and the LVDT linear displacement sensor is used for measuring the tensile/compressive deformation quantity generated by the sample in the test process; the main body structures of the static arm part and the movable arm part are basically the same, and the static arm part and the movable arm part are responsible for sample clamping and torsion angle measurement. Has the advantages that: the device can synchronously measure the tensile deformation and the torsional deformation in the material mechanical property test under the loading conditions of single tensile load, single torsional load and tensile-torsional composite load, and has good adaptability to the large-scale tensile deformation. Good universality, low cost and convenient use.

Description

Tension-torsion composite extensometer suitable for plate-shaped sample

Technical Field

The utility model relates to an accurate sensor and accurate instrument technical field, in particular to draw and turn round compound extensometer suitable for plate-like sample.

Background

Engineering materials often bear mechanical loads of various different forms under actual service conditions, and with the development of material testing technologies and the improvement of material testing requirements of engineering actual applications, traditional single-load material mechanical property testing instruments and related supporting equipment cannot meet the requirements. A series of material testing instruments under the condition of composite load loading are produced. As one of the most reliable means for measuring strain, the fact that the traditional extensometer is not compatible with multi-load coupling loading has become a considerable concern for the study relating to the elbow. The development of accurate and reliable extensometers capable of being compatible with multi-load coupling conditions is urgent.

Disclosure of Invention

An object of the utility model is to provide a draw and turn round compound extensometer suitable for plate-like sample solves the above-mentioned problem that prior art exists. The utility model discloses can carry out synchronous measurement to tensile deformation, torsional deformation in the material mechanics performance test under single tensile load, single torsional load and tensile-twist reverse compound load loading condition, have fine adaptability to large-scale tensile deformation in addition. Has the advantages of good universality, low cost, convenient use and the like.

The above object of the utility model is realized through following technical scheme:

a tension-torsion composite extensometer suitable for a plate-shaped sample can synchronously measure tension deformation and torsion deformation in a material mechanical property test under the loading conditions of a single tension load, a single torsion load and a tension-torsion composite load, and has good adaptability to large-scale tension deformation; the base platform 16 in the base assembly is a supporting unit of the whole extensometer, the static arm supporting seat 1 is connected with the base platform 16 through a bolt to be used as a support of a static arm part, and the movable arm supporting seat 12 is connected with the flange sliding block 13 through a bolt to be used as a support of a movable arm part; the linear guide rail 15 is fixedly connected to the bottom platform 16 through bolts, and the linear guide rail 15 and the flange sliding block 13 are used as a guide mechanism of a movable arm part; two ends of the LVDT linear displacement sensor 14 are respectively connected with the movable arm support 12 and the static arm support 1 and used for measuring the tensile/compressive deformation of the sample in the test process.

The main structures of the static arm part and the movable arm part are substantially the same, two guide rods 2 are used for guiding the upper sliding block 6 and the lower sliding block 3, the upper cross beam 7 and the lower cross beam 11 are respectively connected with a blade 8 through bolts in the sample clamping direction, and the upper cross beam 7 and the lower cross beam 11 are connected with the upper sliding block 6 and the lower sliding block 3 through shaft hole matching, so that the sample can be clamped and can rotate around the loading direction along with the sample; the coded disc 10 is fixedly connected with two ends of the upper cross beam 7 through bolts, the central axis of the coded disc 10 is matched with the axis of a pin shaft of the upper cross beam 7, and the encoder circuit board 9 is connected with the upper sliding block 6 through bolts to realize the measurement of the torsion angle of the sample; the clamping spring 4 is in a stretched state, so that clamping force is provided for the blade 8, and the reliable clamping of the sample is guaranteed; positioning spring 5 be in by compression state, for

last slider

6 and 3 provide thrust of gliding block, the guarantee twists reverse the angle measurement's accuracy.

The beneficial effects of the utility model reside in that:

the beneficial effects of the utility model reside in that: the device can synchronously measure the tensile deformation and the torsional deformation in the material mechanical property test under the loading conditions of single tensile load, single torsional load and tensile-torsional composite load, and has good adaptability to the large-scale tensile deformation. Has the advantages of good universality, low cost, convenient use and the like.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate example embodiments of the invention and together with the description serve to explain the invention without limitation.

FIG. 1 is the overall structure diagram of the present invention

FIG. 2 is a schematic view of the top view structure of the present invention

FIG. 3 is the installation schematic diagram of the test sample and the clamp of the testing machine

FIG. 4 is the schematic view of the sectional structure of the present invention

FIG. 5 is a schematic view of the upper clamping unit of the present invention

In the figure: 1. a static arm supporting seat; 2. a guide bar; 3. a lower slide block; 4. a chucking spring; 5. a positioning spring; 6. an upper slide block; 7. an upper cross beam; 8. a blade; 9. an encoder circuit board; 10. code disc; 11. a lower cross beam; 12. a movable arm supporting seat; 13. a flange slider; 14. an LVDT linear displacement sensor; 15. a linear guide rail; 16. bottom platform

Detailed Description

The details of the present invention and its embodiments are further described below with reference to the accompanying drawings.

Referring to fig. 1, the utility model discloses a compound extensometer is turned round in drawing suitable for plate-like sample can carry out synchronous measurement to tensile deformation, torsional deformation in the material mechanics performance test under single tensile load, single torsional load and the tensile-twist composite load loading condition, has fine adaptability to large-scale tensile deformation in addition. The structure is as follows: the base platform 16 in the base assembly is a supporting unit of the whole extensometer, the static arm supporting seat 1 is connected with the base platform 16 through a bolt to be used as a support of a static arm part, and the movable arm supporting seat 12 is connected with the flange sliding block 13 through a bolt to be used as a support of a movable arm part; the linear guide 15 is fixed on the base 16 through bolt connection, and the linear guide 15 and the flange slider 13 are used as a guide mechanism of the movable arm part.

The static arm part and the movable arm part are basically the same in structure.

The upper sliding block 6 is matched with the upper cross beam 7, and the lower sliding block 3 is matched with the lower cross beam 11 through pin holes.

Referring to fig. 2, two ends of the LVDT linear displacement sensor 14 are respectively connected to the movable arm support 12 and the stationary arm support 1, and are used for measuring the tensile/compressive deformation of the sample during the test.

Referring to fig. 3, the tension-torsion composite extensometer for a plate-shaped sample aims at a material mechanical property test of the plate-shaped sample, and during installation and use, the four cutting edges 8 are ensured to be tightly attached to the surface of the plate-shaped sample.

Referring to fig. 4, the movable arm part is guided by two guide rods 2 for an upper sliding block 6 and a lower sliding block 3, an upper cross beam 7 and a lower cross beam 11 are respectively connected with a blade 8 through bolts in a sample clamping direction, and the upper cross beam 7 and the lower cross beam 11 are connected with the upper sliding block 6 and the lower sliding block 3 through shaft holes in a matching manner, so that the sample can be clamped and can rotate around a loading direction along with the sample; the clamping spring 4 is in a stretched state, so that clamping force is provided for the blade 8, and the reliable clamping of the sample is guaranteed; positioning spring 5 be in by compression state, for

last slider

Referring to fig. 5, the code wheel 10 is fixed at two ends of the upper cross beam 7 through bolt connection, the central axis of the code wheel 10 is matched with the axis of the pin shaft of the upper cross beam 7, and the encoder circuit board 9 is connected with the upper slide block 6 through bolt connection, so that the measurement of the torsion angle of the sample is realized.

In the process of a material mechanical property test under a single tensile load loading condition, a sample generates deformation along the load loading direction under the action of tensile load, a movable arm part and a static arm part clamp the sample through a cutting edge under the action of a clamping spring 4 and a positioning spring 5, the movable arm part translates along the load loading direction under the action of a guide mechanism consisting of a linear guide rail 15 and a flange sliding block 13 along with the deformation of the sample, and two ends of an LVDT linear displacement sensor 14 are respectively connected with a movable arm supporting seat 12 and a static arm supporting seat 1, so that the tensile deformation of the sample in the test process can be measured. The compression experiment process is the same as the principle.

In the process of a material mechanical property test under a single torsional load loading condition, a sample generates torsional deformation coaxial with the torsional load under the action of the torsional load, a movable arm part and a fixed arm part clamp the sample through a blade under the action of a clamping spring 4 and a positioning spring 5, an upper cross beam 7 and a lower cross beam 11 rotate at the same angle around a torsional load loading axis along with the deformation of the sample under the action of matching a guide rod 2 and a pin hole, a code wheel 10 rotates at the same angle along with the upper cross beam 7, an encoder circuit board 9 is fixedly connected with an upper sliding block 6 and does not rotate, and the torsional deformation of the sample in the test process can be measured.

In the process of a material mechanical property test under a tension-torsion composite load loading condition, the working condition of the tension-torsion composite extensometer suitable for the plate-shaped sample is regarded as that a single tension load loading and a single torsion load loading occur simultaneously, the single tension load loading and the single torsion load loading do not interfere with each other, the working principle is not changed, and details are not repeated here.

The above description is only a preferred example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made to the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a draw and turn round compound extensometer suitable for platelike sample which characterized in that: the device can synchronously measure the tensile deformation and the torsional deformation in the material mechanical property test under the loading conditions of single tensile load, single torsional load and tensile-torsional composite load, and has good adaptability to the large-scale tensile deformation; a base platform (16) in the base assembly is a supporting unit of the whole extensometer, a linear guide rail (15) and a flange sliding block (13) are used as a guide mechanism of a movable arm part, and an LVDT linear displacement sensor (14) is used for measuring the tensile/compressive deformation quantity generated by a sample in the test process.

2. The composite tension-torsion extensometer for plate-shaped samples according to claim 1, characterized in that: the main structures of the static arm part and the movable arm part are substantially the same, two guide rods (2) are used for guiding an upper sliding block (6) and a lower sliding block (3), an upper cross beam (7) and a lower cross beam (11) are respectively connected with a cutting edge (8) through bolts in the sample clamping direction, and the upper cross beam (7) and the lower cross beam (11) are connected with the upper sliding block (6) and the lower sliding block (3) through shaft hole matching, so that the sample can be clamped and can rotate around the loading direction along with the sample; the coded disc (10) is fixedly connected with the two ends of the upper cross beam (7) through bolts, and the encoder circuit board (9) is connected with the upper sliding block (6) through bolts to realize the measurement of the torsion angle of the sample; the clamping spring (4) is in a stretched state, so that clamping force is provided for the blade (8), and the sample is reliably clamped; the positioning spring (5) is in a compressed state, provides thrust for the upper sliding block (6) and the lower sliding block (3), and guarantees the accuracy of torsion angle measurement.