基于微观力学失效理论的复合材料单钉螺栓连接结构拉伸行为预测

Static tensile behavior of the single-lap bolted composite joints based on micro-mechanics of failure

本文基于微观力学失效理论(MMF)对碳纤维增强层合板螺栓静载拉伸逐步失效机制及强度进行预测。建立基于MMF理论的层合板结构强度分析方法,使用MMF理论对加载过程中组分的失效类别进行判别,根据组分失效的类别制定出相应的材料性能退化方案来实现对复合材料的逐步失效分析,分析中考虑了复合材料层合板非线性剪切性能。在Abaqus平台上进行二次开发,使用Python代码自定义用户材料子程序(UMAT)开发了基于MMF理论的层合板结构强度分析程序。基于MMF理论对UTS50/E51复合材料层合板螺栓连接静载拉伸的失效机制及强度进行分析,并将预测结果与试验结果进行对比。

This paper deals with prediction of the failure mechanism and static tensile strength of the bolted joint structures of carbon fiber reinforced plastic laminate based on the micro-mechanics of failure(MMF)theory.The strength analysis method of laminate structure is established based on MMF.In the process of loading,the constituent failure can be identified by the MMF theory,then the material properties degradation scheme is applied to analyze the progressive failure of composite materials based on the constituent failure categories,the non-linear shear behavior of laminate is taken into account.The user-defined material subroutine UMAT for the structure strength analysis program of laminate is developed using the Abaqus Python scripts.The failure mechanism and static tensile strength of the bolted joint structures of polymer composites is studied based on MMF.The tension tests for the bolted joints structure of UTS50/E51laminate are carried out.The failure mechanisms and strengths obtained from both theoretical analysis and test are compared.