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Off-axis compression test fixture for composite laminated plate

A composite material layer, compression test technology, used in the analysis of materials, the use of stable tension/pressure test material strength, measurement devices and other directions, can solve the problems of unsatisfactory test results, low test efficiency, etc. It is stable, avoids the crushing of the specimen, and facilitates disassembly.

Active Publication Date: 2020-06-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems existing in the above-mentioned prior art, to provide a method suitable for use in off-axis compression tests of composite materials, and to solve the unsatisfactory off-axis compression test results and low test efficiency of non-standard composite materials in the prior art. Composite material laminated plate off-axis compression test fixture that can ensure uniform stress on off-axis compression test pieces

Method used

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  • Off-axis compression test fixture for composite laminated plate
  • Off-axis compression test fixture for composite laminated plate
  • Off-axis compression test fixture for composite laminated plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An embodiment of the present invention provides a fixture for off-axis compression of a composite laminate, comprising an upper base body 4 and a lower base body 9, and the upper base body 4 and the lower base body 9 are slidably connected in the vertical direction through a sliding assembly;

[0027] The opposite end of the upper base body 4 and the lower base body 9 is provided with a clamping structure for clamping the end of the test piece 3, and each base is provided with a clamping structure for pressing the end of the test piece 3 along the longitudinal direction. The briquetting block 10 and a loading structure for applying load to the corresponding briquetting block 10; each seat body is located on the left and right sides of the test piece 3 and is respectively detachably connected with a side stopper 8 for restricting the left and right movement of the test piece 3.

[0028] Further, the clamping structure includes clamp jaws 6 opened on the base, the test pie...

Embodiment 2

[0036] This embodiment is based on Embodiment 1, the side of the gripping block 5 in contact with the clamped surface of the test piece 3 is a toothed surface, and the toothed surfaces of the clamping blocks 5 on both sides of the test piece 3 are parallel to each other so as to be parallel to the test piece 3 The two clamped surfaces are tightly fitted.

[0037] In this application, the clamping block 5 is a wedge-shaped structure, and the contact surface of the clamping block jaw 6 and the clamping block 5 is also a wedge-shaped slope, the wedge-shaped slope is inclined to the center, and the inner slope extends to the upper base 4 or extends to the inside of the lower base 9, Now take the lower base body 9 as an example, the clamp jaw 6 is located in the center of the lower base body 9 and is integrally formed with the lower base body 9; The distance between the tooth lines is equal, and each tooth line is parallel to each other. The lower end of the test piece 3 is clamped...

Embodiment 3

[0039] This embodiment is based on Embodiment 1, the sliding assembly includes a longitudinal guide rod 7, the lower end of the guide rod 7 is fixed on the lower base body 9, the upper end of the guide rod 7 passes through the upper base body 4 and is slidably connected with it, the guide rod 7 The upper end of the rod 7 is also covered with a linear bearing 2, and the linear bearing 2 is fixed inside the upper body 4;

[0040] There are two sliding assemblies, and the two sliding assemblies are symmetrically distributed on the left and right sides of the clamp jaw 6 .

[0041] The guide rod in this application is a long cylindrical structure, and the upper base body 4 and the lower base body 9 are slidably connected by a sliding assembly. When in use, the clamps of the two clamping mechanisms can slide relative to each other, making it suitable for off-axis compression tests of different sizes. Components, and easy to use DIC, strain gauges and other measuring equipment.

[...

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Abstract

The invention provides an off-axis compression test fixture for a for composite laminated plate, which comprises an upper seat body and a lower seat body, and the upper seat body and the lower seat body are in sliding connection in the vertical direction through a sliding assembly; each of the opposite ends of the upper seat body and the lower seat body is provided with a clamping structure used for clamping the end of a test piece, and each seat body is provided with a pressing block used for pressing the end of the test piece in the longitudinal direction and a loading structure used for applying loads to the corresponding pressing block. The left side and the right side of the test piece on each seat body are respectively and detachably connected with side baffle blocks for limiting thetest piece to move left and right; the invention provides a test fixture which can ensure that an off-axis compression test piece is uniformly stressed and is suitable for an off-axis compression test of a composite material.

Description

technical field [0001] The invention belongs to the technical field of fiber-reinforced composite material testing, and in particular relates to a fixture for off-axis compression testing of composite material laminates. Background technique [0002] Fiber-reinforced composites are increasingly used in modern aerospace structures. Only by accurately grasping the basic mechanical properties of composite materials can we make full use of its performance advantages and design more reasonable structures based on composite materials. Composite materials have mechanical properties different from metal materials, so it is necessary to study the mechanical response of composite materials under complex stress states. Through the unidirectional compression test of composite material, the mechanical response and strength performance of the material under the mixed stress state of compression and shear can be studied. [0003] The main equipment for measuring the basic mechanical prop...

Claims

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Application Information

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IPC IPC(8): G01N3/04G01N3/08
CPCG01N3/04G01N3/08G01N2203/0019G01N2203/0282G01N2203/0423
Inventor 马一凡李亚智杨帆张磊张丽
Owner NORTHWESTERN POLYTECHNICAL UNIV
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