Thermo-mechanical properties of RTM-made carbon fibre/polyimide composite attaching collar under transient heating  

作　　者：Shengda JIANG Chuyang LUO Peng ZHANG Jianwen BAO Peipei CAI Xufeng XIA 

机构地区：[1]Shanghai High Performance Fibers and Composites Center(Province-Ministry Joint),Center for Civil Aviation Composites,Donghua University,Shanghai 201620,China [2]AVIC Composite Technology Center,Science and Technology on Advanced Composites Laboratory,Beijing 101300,China [3]Luoyang Optoelectro Technology Development Center,Luoyang 471009,China

出　　处：《Chinese Journal of Aeronautics》2023年第3期393-405,共13页中国航空学报（英文版）

基　　金：supported by the Young Elite Scientists Sponsorship Program by the China Association for Science and Technology(No.2016QNRC001);the Science and Technology Commission of Shanghai Municipality,China(No.19DZ1100300)。

摘　　要：This study focuses on the thermo-mechanical properties of Carbon Fibre/Polyimide Composite(CFPC)attaching collars under transient heating.The CFPC attaching collars were fabricated by a high-temperature resin transfer moulding process,and their thermo-mechanical properties under the conditions of simultaneous transient heating and bending load were investigated.The results show that the attaching collar tends to fail at 118% of the limit load.The failure mode includes the fracture of the connecting screws,local extrusion damage of the hole edges,and slight ablation damage at the outer plies.And there is no observable residual deformation in the composite attaching collar.Furthermore,considering that the material properties vary with temperature,a progressive damage model based on the sequential thermo-mechanical coupling method was established to study the failure mechanism of the attaching collar.Finally,the damage factor of the CFPC was calculated to assess the safety status of the attaching collar.The results show that the primary damage modes of the composite attaching collar are intralaminar failure,which mainly occurs at the heat insulation layer and the hole edges,and these slightly affect the structural bearing capacity.A good correlation between the experiment and FEA is obtained.The test methods and analysis models proposed contribute to the safety assessment of composite structures under transient heating.

关 键 词：Polyimide composites Progressive damage model Resin transfer moulding Thermo-mechanical properties Transient heating 

分 类 号：TB332[一般工业技术—材料科学与工程]