Forming limit and failure behavior of fiber metal laminates under low-constraint conditions  

作　　者：Yao WANG Feng DING Yong LI Yunhua ZHANG Sifa ZHENG Libin ZHAO Ning HU 

机构地区：[1]School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China [2]Suzhou Automotive Research Institute(Xiangcheng),Tsinghua University,Suzhou 215134,China [3]State Key Laboratory of Reliability and Intelligence Electrical Equipment,Hebei University of Technology,Tianjin 300130,China [4]School of Mechanical Engineering and Automation,Beihang University,Beijing 100191,China [5]Henan Benjie Technology Co.,Ltd.,Zhengzhou 450003,China [6]Key Laboratory of Advanced Intelligent Protective Equipment Technology,Ministry of Education,Tianjin 300401,China [7]Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology,Hebei University of Technology,Tianjin 300401,China

出　　处：《Chinese Journal of Aeronautics》2025年第1期638-653,共16页中国航空学报(英文版)

基　　金：supported by the National Natural Science Fund of China(Nos.52005153,12227801,32300666,12072005,U23A2607);the Tianjin"Project+Team"Key Training Program,China(No.XC202052);the Key Program of Research and Development of Hebei Province,China(Nos.202030507040009,23311812D);the Natural Science Foundation of Hebei Province,China(No.E2023202183);the Project of High-Level Team Construction Introduction of Hebei Province,China(No.244A7620D);the Research Cooperation Project of Universities Stationed in Hebei Province and Shijiazhuang City,China(No.241080114A);Hebei Province Military-Civilian Integration Science and Technology Innovation Project,China(No.SJMYF2022X15)。

摘　　要：Fiber Metal Laminates(FMLs),as high-performance composite materials,demonstrate exceptional potential in a wide range of applications,such as aeronautical and astronautical industries.However,the traditional cured FMLs possess complex interlayer stresses and low forming limits,restricting further promotion and application of FMLs.Low-constraint FMLs exhibit a lower forming resistance and better formability due to no curing during the forming process;however,the formation mechanism and response are not clear.This paper presents the Forming Limit Diagram(FLD)of low-constraint GLARE(glass fiber reinforced aluminum laminates)based on the forming limit test,and compares it with the conventionally cured laminates to evaluate the differences in the forming limit.In addition,combined with the analysis of failure mechanism and micro-deformation mechanism of specimens,the influence of different temperatures(20–80℃)and forming states(width)on the deformation performance of laminates is further explored.The results reveal that the forming limit curve of low-constraint laminates shifts up with the increase of temperature,the forming limit initially increases with the increase of width,then followed by a gradual decrease,and the maximum principal strain of low-constraint laminates is increased by 29% at 80℃ compared to 20℃.The cured laminate has a principal strain range of 0–0.02,while the low-constraint laminates have a principal strain range of 0.03–0.14.Compared with cured laminates,low-constraint laminates possess a higher forming limit due to the improvement in deformable degree between layers by resin flow and fiber slippage,which enhances their formability.This study is expected to serve as a reference for establishing forming limit criteria and optimizing forming schemes for low-constraint laminates.

关 键 词：Fiber Metal Laminates(FMLs) GLARE Low-constraint state Forming limit Failure mechanism 

分 类 号：V250[一般工业技术—材料科学与工程] TB33[航空宇航科学与技术—航空宇航制造工程]