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Artificial Simulation Method of Impact Damage of Composite Honeycomb Sandwich Structure

A technology of honeycomb sandwich structure and impact damage, which is applied to the artificial simulation of impact damage of composite honeycomb sandwich structure and the field of artificial simulation of core damage in honeycomb structure, which can solve the problems of ineffective simulation of honeycomb core damage, etc. Conducive to the correct assessment of structural strength, conducive to the effect of reasonable repair decisions

Active Publication Date: 2020-12-29
CHINA AIRPLANT STRENGTH RES INST
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention is aimed at the technical problem that the existing artificial damage simulation method cannot effectively simulate the damage of the honeycomb core caused by the impact in the process of making the comparison test block of the composite material honeycomb sandwich structure. Artificial Simulation Method of Impact Damage of Sandwich Structure

Method used

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  • Artificial Simulation Method of Impact Damage of Composite Honeycomb Sandwich Structure
  • Artificial Simulation Method of Impact Damage of Composite Honeycomb Sandwich Structure
  • Artificial Simulation Method of Impact Damage of Composite Honeycomb Sandwich Structure

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Effect test

Embodiment 1

[0040] The artificial simulation method of impact damage of composite honeycomb sandwich structure, its specific implementation process is as follows:

[0041] 1) Fabricate the honeycomb core prefabricated part: select a suitable honeycomb core according to the design requirements and cut it to the required size to form the honeycomb core prefabricated part 1 .

[0042] 2) Simulation calculation and analysis: According to the actual physical parameter characteristics and related mechanical performance data of the honeycomb core prefabricated part 1, the finite element model of the honeycomb core prefabricated part is established, and the local area of ​​the honeycomb core prefabricated part is uniformly distributed through the finite element analysis software. The static pressure load is simulated and calculated (the size of the area where the load is applied depends on the desired damage size), and the compression displacement value of the honeycomb core just entering the unst...

Embodiment 2

[0049] 1) Making a honeycomb prefabricated part: select a suitable honeycomb core according to the design requirements and cut it to the required size to form a honeycomb core prefabricated part 1 .

[0050] 2) Simulation calculation and analysis: According to the actual physical parameter characteristics and related mechanical performance data of the honeycomb core prefabrication 1, the finite element analysis model of the honeycomb core prefabrication is established, and the free fall impact simulation of the honeycomb prefabrication is carried out through the finite element analysis software Calculate (the diameter of the spherical punch depends on the desired damage size), and obtain the impact energy value when the honeycomb core loses stability under the impact load and reaches the expected size value.

[0051] 3) Implement the impact test: fix the honeycomb core prefabricated part 1 on the workbench 8 of the free-fall hammer impact testing machine, and ensure that the ce...

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Abstract

The invention provides a manual simulation method for impact damage of a composite honeycomb sandwich structure. First, the honeycomb core is cut according to the size of the comparative test block to be designed to form a honeycomb core prefabricated part, and the honeycomb core is unstable by static pressure or low-speed impact. The damage is to simulate the damage of the honeycomb core caused by the impact. After the core collapse area on the honeycomb core is repaired, the honeycomb core prefabricated part containing the core damage and the upper and lower skins are cured to form a comparison test block. The invention can truly simulate various damage modes caused by impact in the honeycomb sandwich structure, and the comparison test block produced by this method is used as the equipment adjustment reference when the honeycomb sandwich structure is detected, which is better than the comparison of the prefabricated by the existing damage simulation method. The test block can more accurately and quantitatively evaluate the damage degree of the honeycomb sandwich structure caused by impact, and is more conducive to the correct evaluation of the structural strength and the formulation of reasonable repair decisions.

Description

technical field [0001] The invention belongs to the technical field of structural non-destructive testing, in particular to an artificial simulation method for impact damage of a composite honeycomb sandwich structure, in particular to an artificial simulation method for core damage in a honeycomb structure caused by the low-speed impact of foreign objects. Background technique [0002] The composite honeycomb sandwich structure is formed by bonding the upper and lower panels and the middle honeycomb core through the bonding layer (see figure 1 ), with light weight and high strength performance, it is widely used in aerospace, ships, trains and other industrial fields. However, this structure is particularly sensitive to low-velocity impacts from hail, runway debris, and falling maintenance tools during use. Low-speed impact will cause delamination or damage of the face plate of the honeycomb structure, debonding of the face plate and the honeycomb core, and wrinkling or fr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/08G06F30/23
CPCG01M7/08G06F30/23
Inventor 詹绍正王丹杨鹏飞宁宁王育鹏焦婷黄华斌
Owner CHINA AIRPLANT STRENGTH RES INST
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