Study on compressive residual strength of hat-stiffened composite panel structure after impact
ZHOU Kaiyuan
ZHANG Ru
LI Xinxiang
Abstract：[Objective]In view of the limited research on the compressive residual strength of hat-stiffened composite panels structure after edge-on impact,this study aims to investigate the degradation mechanism and influence of edge-on impact on the load-bearing capacity of such structures,so as to provide reference for impact damage tolerance design.[Methods]Firstly,low-velocity impact and compression-after-impact tests were conducted on hat-stiffened composite panels.Secondly,a progressive failure analysis model considering fiber,matrix,and interlaminar damage was established.An integrated simulation of low-velocity impact and compression after impact was implemented in Abaqus software by writing a Vumat subroutine,which accurately introduced the impact damage and predicted the residual strength.Then,the validity of the model was verified by comparing experimental and simulation results.Finally,the influence of edge-on impact on the compressive residual strength and failure modes was analyzed.[Results]The results show that the proposed model can effectively predict the morphology and size of edge-on impact damage,with a prediction error for the delamination area less than 5.6%.Compared with the undamaged specimens,the compressive failure load of specimens with edge-on impact damage decreased by more than 46.9%.The primary failure modes are identified as transverse fracture of the hat-stiffener and debonding of the stiffener-skin interface on the impact side,which are consistent with the experimental observations.
Keywords：Hat-stiffened composite panelEdge-on impactCompression after impactProgressive failure analysis methodFailure mode
Publication Date：2026-04-30
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：9( 66-74 )