TIAN S X, QIN Z H, LI G K, et al.Study on damage analysis method of new sandwich composite material[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(5):161-168.

doi:10.16186/j.cnki.1673-9787.2021110104

Received:2021/11/24

Revised:2022/02/25

Published:2023/09/25

Study on damage analysis method of new sandwich composite material

TIAN Shuxia, QIN Zhihui, LI Guangke, ZHU Qiankun, FANG Zhanpeng

School of Mechanical and Electrical Engineering，Zhengzhou University of Light Industry，Zhengzhou 450002，Henan，China

Abstract:In order to achieve non-destructive detection of delamination defects caused by impact loads and fatigue during the processing and service of sandwich corrugated plates,a detection method for quantitative identification of damage was proposed based on dynamic response parameters,and a damage analysis method for sandwich corrugated plate structures was studied.According to the theory of natural frequency,modal shape,modal curvature,modal strain energy and other parameters,the finite element models of sandwich corrugated plate were established.Based on the dynamic response parameters,the surface smoothing algorithm,curvature modal change rate method and two-dimensional continuous wavelet transform method were developed to identify the structural debonding defects.Then,modal analysis was conducted on the model to obtain the modal shape of the damaged sandwich corrugated plate.The central difference method was used to obtain the modal curvature,which was used as a damage sensitive parameter.The proposed damage detection methods were used to process the sensitive parameter,establish damage identification indicators,identify the location and quantity of damage,compare and analyze the damage identification results of each method.The results showed that the curvature mode change rate method and the two-dimensional continuous wavelet transform method can effectively identify the location and quantity of defects,and the curvature mode change rate method had more significant damage identification indicators,with the best damage identification effect.However,in the case of one preset damage,the surface smoothing algorithm needed further research and verification.

Key words:sandwich composite;desoldering damage and defect;dynamic response parameter;curvature smoothing mode algorithm;quantitative damage analysis

夹芯复合材料损伤分析方法研究_田淑侠.pdf