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Method of evaluating debonding of honeycomb sandwich structure at high temperature

A technology of honeycomb interlayer and debonding, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems such as the evaluation method of debonding of honeycomb sandwich structure that does not exist yet, and achieve good evaluation results, easy implementation, and simple system construction.

Active Publication Date: 2019-06-21
NORTHWEST INST OF NUCLEAR TECH
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  • Abstract
  • Description
  • 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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  • Method of evaluating debonding of honeycomb sandwich structure at high temperature
  • Method of evaluating debonding of honeycomb sandwich structure at high temperature
  • Method of evaluating debonding of honeycomb sandwich structure at high temperature

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Embodiment Construction

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

[0033] see figure 1 , a honeycomb sandwich structure debonding evaluation method at high temperature, the main steps are:

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

[0035] Step 2) Perform a flat tensile strength test on the honeycomb sandwich structure sample to obtain the strength σ(T) of the adhesive layer between the faceplate 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 honeycomb sandwich structure sample to thermal equilibrium; pass the mechanical loading rod 2 through the high temperature resistant adhesive layer 1 (it needs to be explained that ...

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Abstract

The invention relates to a method of evaluating debonding of a honeycomb sandwich structure at a high temperature. The method mainly comprises the following steps: 1) a honeycomb sandwich structure sample is selected; 2) flat tensile strength test is carried out on the honeycomb sandwich structure sample at a different temperature to obtain the bonding layer strength between the panel of the honeycomb sandwich structure and a honeycomb core; 3) a debonding air pressure threshold of the honeycomb sandwich structure sample at a different temperature is calculated; 4) through irradiation heatingtest, a relationship curve for the air pressure in the honeycomb core of a to-be-evaluated honeycomb sandwich structure and the temperature of the bonding layer between the panel of the to-be-evaluated honeycomb sandwich structure and the honeycomb core is acquired; and 5) the debonding air pressure threshold and the air pressure in the honeycomb core of the to-be-evaluated honeycomb sandwich structure at the same temperature are compared, and debonding judgment is carried out. The method has the characteristics of a wide temperature application range, simplicity, easy operation and the like,and provides support for application of a device / structure prepared by adopting the material or failure evaluation later.

Description

technical field [0001] The invention belongs to the field of mechanical testing and analysis, and relates to a method for evaluating the debonding of a honeycomb sandwich structure under high temperature. Background technique [0002] The debonding of composite materials, especially honeycomb sandwich structures, at high temperature is an important factor affecting their mechanical properties. The research shows that the flexural stiffness and shear stiffness of the honeycomb sandwich structure will decrease significantly after the debonding between the panel and the honeycomb core. Therefore, the debonding evaluation of honeycomb sandwich structures is of great significance. At present, there is no method for evaluating the debonding of honeycomb sandwich structures under variable temperature conditions. SUMMARY OF THE INVENTION [0003] In order to solve the technical problems existing in the background art, the present invention provides a method for evaluating the de...

Claims

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Application Information

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Patent Type & Authority Applications(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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