缠绕线型对缠绕复合材料圆管轴向拉伸失效的影响

采用细观刚度模型的有限元分析（FEA）与改进的逐渐累积损伤方法相结合，建立了缠绕复合材料圆管轴向拉伸失效的分析方法与流程，以揭示缠绕线型对缠绕复合材料损伤失效的影响。对沿圆周方向分布有1个、3个和5个单胞的3种不同线型的缠绕复合材料圆管试件进行轴向拉伸破坏实验，获得其失效形式、平均拉伸强度及其随缠绕线型的变化规律。研究表明：缠绕复合材料圆管轴向拉伸失效主要以丧失承载能力的功能失效为主，缠绕线型对其拉伸强度有一定的影响；数值分析结果表明，轴向拉伸过程中，主要损伤为基体开裂与基纤剪切，纤维交叉容易引起损伤起始与扩展。

Influence of winding pattern on failure of filament wound composite pipe under axial tension

The analytical procedure of filament wound composite pipe under axial tension was built up with finite element analysis (FEA), which adopted micro stiffness model and improved progressing damage method for displaying the influence of filament winding pattern on propagation of damage in filament wound composite and its failure. The axial tensile experiments were performed for three kinds of winding pattern such as one, three and five represent volume element along the circumferential direction of filament wound composite pipe and failure model, average tensile strength and regulation of strength with winding pattern were obtained. The experiments show that the tensile failure of filament wound composite pipe under axial tension is mainly function failure with loss of bearing capacity. Winding pattern has some effect on the tensile strength of filament wound composite. The numerical simulation demonstrates that main damage are matrix crack and fiber/matrix debonding and fiber crossing can result in damage initiation and propagation more easily in the process of axial tension.