碳纤维复合材料接头力学性能试验与仿真分析

采用试验和仿真分析的方法对T800/924复合材料接头在拉伸载荷作用下的力学性能进行研究。在电子万能试验机上进行了接头试验件的拉伸试验，记录试验中试验件的破坏过程，得到了最终失效载荷。采用非线性有限元法，基于ABAQUS软件平台，使用内嵌的材料用户定义子程序（VUMAT），建立了该试验对应的有限元分析模型，得到接头的应变分布情况，并给出接头失效载荷的计算值。结果表明:计算预测接头的损伤部位与试验吻合，失效载荷计算值与试验值差值较小，证明了仿真分析方法的可行性。通过结果分析发现，孔边是应力集中的地方，破坏一般从孔边开始萌生，并且接头面外受载能力较弱，接头的失效模式一般是孔边面外拉脱。 

Test and simulation analysis of mechanical properties for joint of carbon fiber composites

The mechanical properties of T800/924 composite joints under tensile loading were studied by means of test and simulation analysis. The tensile test of the joint specimen was carried out on the electronic universal testing machine. The failure process of the specimen was recorded during the test and the final failure load was obtained. A nonlinear finite element method was used, based on the ABAQUS software platform, using the embedded material user defined subroutine (VUMAT). The finite element analysis model for the test was established to obtain the strain distribution of the joint, and the calculated value of the joint failure load was given. The results show that the calculation prediction of the damage parts for the joint are in agreement with the test. The difference values between calculated value and test value of the failure load are small. The feasibility of the simulation analysis method is proved. The results analysis show that hole edge is where the stress concentrated. The damage is usually initiated from hole edge and the ability of out-of -plane loaded of joint is poor. Failure mode of joint is generally the pull-out of hole edge surface.