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System for testing damage to gradient composite under thermal/electric/magnetic/coupling action

A gradient material and testing system technology, applied in the direction of analyzing materials, measuring devices, strength characteristics, etc., can solve the problems that the testing of gradient material mechanics and electromagnetic performance indicators cannot be carried out

Inactive Publication Date: 2011-02-23
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If such problems cannot be solved, it will make it impossible to test the mechanical and electromagnetic performance indicators of gradient materials.

Method used

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  • System for testing damage to gradient composite under thermal/electric/magnetic/coupling action
  • System for testing damage to gradient composite under thermal/electric/magnetic/coupling action
  • System for testing damage to gradient composite under thermal/electric/magnetic/coupling action

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Embodiment approach

[0018] Embodiment: The electromagnetic principle diagram of the test system of the present invention is as follows figure 1 shown. A gradient layer with a thickness of 121 μm was prepared on a metal substrate by self-propagating combustion synthesis method, and a gradient material sample with a width of 20 μm and a length of 69 μm was cut. Such as figure 2 As shown, the sensor probe is fixed on the fixture, and the displacement of the fixture is controlled so that the probe of the sensor touches the gradient material, and then the current density applied to the gradient material is 82mA / cm 2 . actually built as figure 2 As shown, due to the alternating thermal stress generated by the direct current in the gradient material, the gradient material passes through 7.58×10 5 Seconds later, holes and microcracks and damages are generated, and further direct current is applied until failure occurs.

[0019] During the whole test process, the CCD probe of the scanning electron ...

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Abstract

The invention relates to the establishment of a system for testing and evaluating damage to a gradient composite under a thermal / electric / magnetic / coupling action and a performance test method. The mechanical property and the physical property of a gradient material are tested by a direct current under the thermal / electric / magnetic / coupling action. The damage to the gradient composite is tested and evaluated by thermal impacting stress generated due to the joule heat caused by the direct current and the thermal expansion coefficient difference of a ceramic and metal gradient composite. The system established in the invention combines damage and property test and characterization integrally and can test the physical and mechanical coupling properties of the gradient material.

Description

technical field [0001] The invention relates to the establishment of a damage test system and a damage performance test method of a gradient composite material under the action of thermodynamic and electromagnetic coupling, and belongs to the technical field of coupling analysis of mechanical experiments and physical properties. Background technique [0002] Gradient composite materials are widely used in thermal protection, electromagnetic protection and other fields. Due to the long-term work under the condition of thermodynamic and electromagnetic coupling, and the gradient material is composed of different materials, the difference in thermal expansion coefficient of the material will cause thermal stress inside the material, which will affect its mechanical reliability and cause mechanical damage. Therefore, it is of great theoretical significance and application value to test the actual working conditions of the gradient material after passing the current to correctly ...

Claims

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Application Information

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IPC IPC(8): G01N3/02G01N3/60
Inventor 李永舒畅
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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