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Test method of stretching stress-strain curve of ceramic matrix composite material

A technology of composite materials and tensile stress, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve the problems of high processing accuracy and the inability to measure the tensile stress-strain curve of ceramic matrix composite materials, etc., to achieve The effect of low machining accuracy requirements, easy implementation, and high test success rate

Inactive Publication Date: 2014-07-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has relatively high requirements on the processing accuracy of the specimen and the fixture. During the experiment, it is necessary to strictly ensure the good alignment of the tensile specimen and the fixture, otherwise there is a bending load on the specimen, which will cause the specimen to break prematurely and cause failure. Measured tensile stress-strain curves of ceramic matrix composites

Method used

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  • Test method of stretching stress-strain curve of ceramic matrix composite material
  • Test method of stretching stress-strain curve of ceramic matrix composite material
  • Test method of stretching stress-strain curve of ceramic matrix composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Select a ceramic matrix composite plate with a length L of 120 mm and a width W of 10 mm, and process it into a dovetail-shaped specimen, such as figure 2 shown;

[0031] (2) Load the fixture with dovetail-shaped tenon groove on the chuck of the tensile testing machine, and then use the centering device to ensure the centering of the upper and lower chucks, and then snap the dovetail-shaped test piece into the tenon groove;

[0032] (3) First, fix the extension rod of the extensometer on both ends of the test section of the dovetail-shaped specimen, then connect the extensometer signal line to the computer of the tensile testing machine, measure and record the strain data of the dovetail-shaped specimen, such as image 3 shown;

[0033] (4) Start the tensile testing machine, adjust the lower chuck to move downward through the actuator, so that the dovetail-shaped test piece bears a small tensile force;

[0034] (5) Start the heating device, heat the dovetail-shap...

Embodiment 2

[0038] (1) Select a ceramic matrix composite plate with a length L of 120 mm and a width W of 10 mm, and process it into a dog-bone-shaped specimen, such as image 3 shown;

[0039] (2) Cut an aluminum reinforcement sheet of the same size and shape as the clamping section of the dog-bone-shaped specimen, and paste the reinforcement sheet on the clamping surface of the dog-bone-shaped specimen with high-strength structural adhesive. Put the dog-bone-shaped test piece into the chuck of the tensile testing machine to adjust the centering, and then clamp the dog-bone-shaped test piece.

[0040] (3), first paste the strain gauge on the strain gauge on the surface of the test section of the dog-bone specimen, then connect the strain gauge to the strain gauge, and finally connect the strain gauge to the computer of the tensile testing machine to measure and record the dog bone The strain data of the test piece, such as Figure 5 shown;

[0041] (4) Start the tensile testing machin...

Embodiment 3

[0045] Step (3) is to first aim the camera of the non-contact tester at the test section of the dog-bone-shaped specimen, and then connect the non-contact tester to the computer of the tensile testing machine to measure and record the strain data of the dog-bone-shaped specimen, such as Image 6 shown. All the other steps are the same as in Example 2.

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Abstract

The invention discloses a test method of a stretching stress-strain curve of a ceramic matrix composite material, and belongs to the technical field of inorganic non-metallic materials. The method comprises the following steps: preparing a ceramic matrix composite sheet material test piece, clamping the test piece with upper and lower chucks of a tension tester; mounting a deformation measuring device on a test section of the test piece, connecting the device with the computer of the tension tester; controlling the lower chuck of the tension tester to move downwards so as to allow the test piece to bear minimal pulling force; testing a stress-strain curve in a displacement control loading mode and by a loading and unloading mode; processing the test piece strain data and the force measured by a force sensor of the tension tester to finally obtain the stress-strain curve of the test piece. The test method of the invention effectively prevents the problem that the test piece is fractured too early due to stress concentration and the stretching stress-strain curve cannot be tested; the test method adopts routine test equipment, has low requirements for processing precision of the test piece and the clamps, is high in test success rate, and is easy to realize.

Description

technical field [0001] The invention relates to a method for testing the tensile stress-strain curve of a composite material, in particular to a method for testing the tensile stress-strain curve of a ceramic matrix composite material, and belongs to the technical field of inorganic non-metallic materials. Background technique [0002] Carbon fiber reinforced ceramics or carbon fiber reinforced carbon matrix composites have the characteristics of high specific stiffness, specific strength, good fracture toughness and wear resistance, and have good high temperature resistance. They can still maintain basic strength in an inert environment over 2000 °C. Without falling, it is a very potential high-temperature structural material in industries such as military, energy and transportation. [0003] The stress-strain curve is a material property curve necessary for structural analysis. Although both the ceramic matrix and carbon fiber are brittle materials, the stress-strain curv...

Claims

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Application Information

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IPC IPC(8): G01N3/08
Inventor 宋迎东高希光孙志刚
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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