高应变率受压荷载下准各向同性碳纤维复合增强层压板的破环分析

对准各向同性纤维复合材料的动态抗压强度进行试验和数字模拟。采用分离式霍普金森压杆,在应变率400/s左右进行准各向同性层压板的平面压缩试验。与静态值相比,准各向同性层压板的动力强度大大增强。采用ABAQUS软件中实体8结点单元C3D8I和作者自定义的8结点界面单元建立有限元模型。界面单元连接三维实体单元来模拟复合材料层,其包括允许初始剥离和扩展的粘结破坏模式。假定模型在这些条件下的破坏现象主要取决于界面的剥离,这一结论通过试验得到验证。试验显示所有的准各向同性层压板几乎劈裂成完整的几块。模型结果与试验结果十分吻合,证实了假设:层内破坏不是准各向同性层压板破坏的主要原因。

Failure Analysis of Quasi-isotropic CFRP Laminates Under High Strain Rate Compression Loading

Dynamic compressive strength of quasi-isotropic fiber composite is investigated experi mentally and also numerically simulated . In-plane compression tests at strain rates around 400/s quasi-isotropic laminates were perfor med using the Split Hopkinson Pressure Bar (SHPB) .The dynamic strength of quasiisotropiclaminates exhibits a considerable increase when compared to the static values . The finite-element model used ABAQUSTMthree-dimensional solid elements C3D8I with 8 nodes and user-defined interface fin...