High Strain Rate Compression Property And Finite Element Analysis Of3D Woven Composites

3D woven composites were wildly used in many fields such as automobile and aerospace as weaver efficiency raised and formation quality improved. Researching the compression property under high strain rate according to structure became important and urgent.Microstructure model was established based on the real structure of3D woven composite after some assumptions were adopted. Finite element method (FEM) was adopted to research the high strain rate compression property, failure mode and failure mechanism. Effectiveness of FEM was verified by experiment.Main contents were listed below:(1) Compression tests were completed on MTS810material test system and split Hopkinson pressure bar apparatus.(2) Microstructure models were established based on the real structure of3D woven composite samples.(3) Compression property simulations under different strain rates began after material property, interface interaction and boundary condition were all assigned.(4) Effectiveness of FEM was verified by comparing results of simulation and experiment. Strain rate effect of compression property and compression failure was analyzed then.The research indicated that microstructure models and FEM is effective in the study of compression property and compression failure of3D woven composites. Obvious strain rate effect was presented according to research results:compression modulus and strength increased with strain rate while failure strain showed a converse trend. Shear failure appeared in the condition of through thickness compression for two kinds of composites. Failure located at two ends in in-plan compression and is composed of fragmentation of resin, fracture of binder yarns and fracture of in-plan yarns for the3D orthogonal basalt fiber composite. Besides, compression resistance behavior in the through thickness direction was better than that in the in-plan direction.