聚酰亚胺复合材料J形筋条壁板的压缩性能研究OA

This study conducts both numerical simulations and experimental investigations on the compressive be-havior of J-type stiffened panels made of polyimide composite under ambient and high-temperature(350℃)condi-tions.Compression tests at room temperature and 350℃were performed to obtain the buckling load,failure load,strain-load relationships,and structural failure modes of the panels.Based on a sequential coupling method,finite-el-ement simulations were carried out to analyze the temperature distribution and thermal strain of the panels under one-sided heating,revealing the compressive failure process,buckling load,and failure patterns at elevated temperature.The results show that high-temperature exposure significantly weakens the compressive capacity of the panels,espe-cially the post-buckling load-carrying ability.The failure modes at both high and ambient temperatures are similar,characterized mainly by inter laminar fiber failure.The simulation results agree well with the experimental data,with errors within 10％.This research provides both theoretical and experimental foundations for performance prediction and engineering application of polyimide composite stiffened panels under high-temperature service conditions.