复合材料科学与工程Issue(4)：1-10,46,11.DOI:10.19936/j.cnki.2096-8000.20250428.001
大厚度L形复合材料层合板残余应变监测和失效行为研究
Research on residual strain monitoring and failure behavior of thick L-shaped composite laminates
摘要
Abstract
The study involves monitoring residual strains and investigating failure behavior in thick L-shaped composite laminates.It aims to explore how the stacking sequence under high thickness conditions affects the struc-tural load-bearing capacity and failure modes.Utilizing embedded fiber bragg grating(FBG),the study monitors the evolution and distribution characteristics of the temperature field and strain field within the curved region of the L-shaped composite laminate during the curing process.It aims to investigate how thickness and ply orientation an-gle influence the thermal residual strain and spring-in angle in L-shaped composite laminates.Conducting bending tests,utilizing DIC(digital image correlation)to observe the strain field and failure modes in the lateral cross-sec-tion.And comparing the results with empirical formulas,exploring the influence of thermal residual stress under dif-ferent ply orientations on the load-carrying capacity and failure modes.The results indicate that the large-thickness L-shaped laminates exhibit a certain temperature gradient,but the temperature difference between the upper and lower layers and the middle layer is relatively small.Due to the mold effect,L-shaped laminates with angles are more likely to generate pre-loaded regions on the inner side of the corner compared to pure 0°ply.The results of the bending test indicate that the ultimate load obtained for pure 0° ply is essentially consistent with the theoretical pre-diction.However,for quasi-isotropic ply,the ultimate load is 25%smaller than the theoretical prediction.The pre-load region has a certain influence on the subsequent load-carrying capacity and failure mode.关键词
L形复合材料/固化监测/前负载/失效模式/残余应力Key words
L-shaped composite/curing monitoring/pre-loaded/failure mode/residual stress引用本文复制引用
王伟伦,曹子荷,俞星辰,卢弈先,曹东风,胡海晓,冀运东,李书欣..大厚度L形复合材料层合板残余应变监测和失效行为研究[J].复合材料科学与工程,2025,(4):1-10,46,11.基金项目
国家自然科学基金(52273080,12302481,12172265) （52273080,12302481,12172265）
湖北省自然科学基金(20231j0223) （20231j0223）
2023年湖北省重大攻关项目(JD2023BAA028) （JD2023BAA028）
