三维角联锁机织复合材料三点弯曲破坏的有限元计算

为了说明一种层层接结三维角联锁机织复合材料在三点弯曲载荷下的动态响应以及结构破坏行为，运用有限元分析软件ABAQUS，在纱线、基体细观结构尺度上计算与考察材料在一恒速弯曲应力作用下的挠度随时间的变化历程、渐进破坏过程、应力分布以及应力集中区域的结构效应。通过分析计算结果发现：三维角联锁机织复合材料的三点弯曲破坏与其结构特征密切相关，破坏由结构中的应力集中区域萌发。此外，应力集中部位主要位于屈曲波浪状的经纱上，且处于各根经纱的弯折部位。这种结构特征使其在材料承载过程中受到的载荷最大，从而导致破坏的进一步扩展。

Finite element calculation forthree-point bending damage of three-dimensional angle-interlock woven composites

In order to describe the dynamic responses and structural damage behavior of one type of layer-to-layer three-dimensional angle-interlock woven composite under three-point bending loading condition, the deflection-time curve，damage evolution, stress distribution and structural effects at regions of stress concentration of the composite under the bending loading condition of constant velocity were calculated by finite element analysis (FEA) software ABAQUS in the microstructural level of yarn and resin. By analyzing the calculation results, it was found that there was a close relationship between the structural characteristics and the bending damage of the composite, the damage was initialled at the regions of stress concentration. In addition, these regions located at the wave-shape parts of undulated warp yarns, such structural characteristic induced these regions to carry the majority part of load, and the further damage evolution.