高性能纤维束纤维尺度横向压缩数值模拟

为深入研究高性能纤维束纤维尺度横向压缩过程及变形机制,基于ANSYS有限元数值分析平台,采用APDL编程语言,在纤维尺度建立了高性能纤维束具有统计意义的三维数值生长模型。该模型考虑了纤维束内部纤维的随机分布与偏转及纤维之间在三维空间不产生相互贯穿的物理特性。利用数值模拟方法研究了纤维束在横向压缩时的变形情况,不仅获得了与纤维束压缩实验一致的非线性变形过程,而且得到了压力与纤维体积含量的定量关系,与经典的理论预测进行对比,获得了较好的支持。

Transverse compression deformation simulation of high performance fiber bundles at the scale of fiber

To investigate the transverse compression deformation mechanism of high performance fiber bundles, by mean of ANSYS parametric design language (APDL)with commercial finite element codes ANSYS,a 3D statis-tical generation-growth numerical model was proposed to generate a micro morphology of continuous fiber bundle. Both the random distribution and the misalignment of fiber in the generation were considered.Penetration of any two fibers was not allowed physically which was also reflected in the protocol.On the base of the generation-growth nu-merical model,the transverse compression deformation of high performance fiber bundles was simulated.The numerical simulation is not only consistent with the non-linear compression loading curves of experiments,but also allows the identifi-cation of the power laws to represent the evolutions of the compressive load and the fiber volume fraction.