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A Method for Debonding Evaluation of Honeycomb Sandwich Structures at High Temperature

A honeycomb interlayer and debonding technology, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve the problems such as the non-existent debonding evaluation method of honeycomb sandwich structure, and achieve the effect of good evaluation results, clear evaluation process and easy implementation

Active Publication Date: 2021-11-05
NORTHWEST INST OF NUCLEAR TECH
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  • Claims
  • Application Information

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Problems solved by technology

At present, there is no evaluation method for debonding of honeycomb sandwich structures under variable temperature conditions

Method used

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  • A Method for Debonding Evaluation of Honeycomb Sandwich Structures at High Temperature
  • A Method for Debonding Evaluation of Honeycomb Sandwich Structures at High Temperature
  • A Method for Debonding Evaluation of Honeycomb Sandwich Structures at High Temperature

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] see figure 1 , a method for evaluating debonding of honeycomb sandwich structures at high temperatures, the main steps of which are:

[0034] Step 1) select the honeycomb sandwich structure sample; the honeycomb sandwich structure sample is selected in the honeycomb sandwich structure to be evaluated in the same process or the same factory batch;

[0035] Step 2) Carry out a flat tensile strength test on the honeycomb sandwich structure sample to obtain the adhesive layer strength σ(T) between the panel and the honeycomb core of the honeycomb sandwich structure;

[0036] see figure 2 , set the temperature T of the heating furnace 3, and use the heating furnace 3 to heat the sample of the honeycomb sandwich structure to thermal equilibrium; pass the mechanical loading rod 2 through the high-temperature resistant adhesive layer 1 (one point to b...

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Abstract

The invention relates to a debonding evaluation method of a honeycomb sandwich structure at high temperature. It mainly includes the following steps: 1) selecting the sample of the honeycomb sandwich structure; 2) performing a flat tensile strength test on the sample of the honeycomb sandwich structure at different temperatures to obtain the strength of the adhesive layer between the panel and the honeycomb core of the honeycomb sandwich structure; 3) Calculate the debonding air pressure threshold of the honeycomb sandwich structure sample at different temperatures; 4) Obtain the air pressure in the honeycomb core in the honeycomb sandwich structure to be evaluated and the temperature of the adhesive layer between the panel and the honeycomb core of the honeycomb sandwich structure to be evaluated through the irradiation heating experiment 5) Comparing the debonding air pressure threshold at the same temperature with the air pressure inside the honeycomb core in the honeycomb sandwich structure to be evaluated to judge debonding. This method has the characteristics of wide applicable temperature range, simple and easy operation, etc., and provides support for the application or failure evaluation of devices / structures prepared with this type of material at high temperatures.

Description

technical field [0001] The invention belongs to the field of mechanical testing and analysis, and relates to a debonding evaluation method of a honeycomb sandwich structure under high temperature. Background technique [0002] The debonding of composite materials, especially the honeycomb sandwich structure at high temperature is an important factor affecting its mechanical properties. Studies have shown that the flexural stiffness and shear stiffness of the honeycomb sandwich structure will decrease significantly after the panels are debonded from the honeycomb core. Therefore, it is of great significance to evaluate the debonding of honeycomb sandwich structures. Currently, there is no evaluation method for debonding of honeycomb sandwich structures under variable temperature conditions. Contents of the invention [0003] In order to solve the technical problems existing in the background technology, the present invention provides a debonding evaluation method of a hon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/00G01N17/00
Inventor 吴丽雄王家伟刘卫平朱永祥马志亮
Owner NORTHWEST INST OF NUCLEAR TECH
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