拉伸载荷下正交三向机织复合材料接头失效多尺度渐进损伤分析

Multi-scale Progressive Damage Analysis of Orthogonal Three-way Woven Composite Joint Failure Under Tensile Load

针对机械打孔三维机织复合材料耳片接头的单轴拉伸破坏性能,采用多尺度分析方法研究孔边纱线破坏过程。结果表明,正交三向(ORT)机织复合材料接头孔边的连续的经纱出现大量的纵向损伤;纬纱单元出现大量横向损伤,损伤沿着孔边45°方向逐渐扩展,纬纱发生剪切失效,最终接头的损伤形式为剪切破坏。数值模拟和试验结果的误差为1.14%,验证了多尺度有限元仿真方法的正确性。孔边细观区域的纱线损伤从孔边扩展到边接头边缘。孔边纱线的分布位置不同,纱线的破坏形式虽不一样,但是不影响破坏的扩展趋势。

In order to examine the failure of uniaxial tension of mechanical perforated 3D woven composite lug joint,a multi-scale analysis way was used to investigate the pore edge yarn failure process.The results showes that there were a lot of longitudinal damage in the continuous warp yarn near the hole of orthogonal three-way(ORT)woven composite joint,a large number of transverse damage appeared in the weft element,and the damage gradually expanded along the 45°direction of the hole edge,there was shear damage in the weft yarn,finally,the joint failed shear failure.The error between the numerical simulation and experimental results is 1.14%,which verifies the correctness of the multi-scale finite element simulation method.The yarn damage in the meso-area of the hole edge extends from the hole edge to the edge of the side joint.The distribution position of hole edge yarns is different,and the destruction form of yarns is different,but it does not affect the expansion trend of destruction.