复合材料厚壁圆筒裂纹扩展的数值模拟

Numerical simulation of crack growth of thick wall tube of composites

为了提高复合材料厚壁圆筒的承载能力,得到其裂纹扩展规律,基于线弹性破坏力学的扩展有限元法,采用非线性有限元软件ABAQUS,建立含损复合材料厚壁圆筒简化模型,进行模拟内压载荷作用下裂纹扩展的仿真计算,得出裂纹沿复合圆筒轴向和径向的扩展规律和复合材料各层的损伤模式。结果表明:同等载荷和边界条件作用下,起始裂纹位于端部要比位于中间部位对复合圆筒结构造成的破坏严重。

In order to improve the carrying capacity of the composite thick wall tube and get the law of the crack growth,based on the principles of linear elastic fracture mechanics(LEFM)and extended finite element method(XFEM),a steel-carbon fiber/epoxy composite tube with pre-existing crack are modeled to predict the development of the crack.The material model is implemented into ABAQUS standard finite element code.The different damage modes and the law of its crack growth along the axis and radial orientation of the composite tube are concluded.The results show that:with the same load and constraint condition,the damage of the composite tube caused by the crack initiated end part of the composite tube is more severe than the crack initiated middle part of the composite tube.