复合材料的应用是现代先进材料技术发展的标志，但是由于复合材料各向异性、层间强度低等力学特性，使得在进行复合材料连接件的强度分析时表现出不同于金属材料的显著非线性，因此对复合材料螺栓连接件进行失效分析具有重要的意义。为了建立准确的数值分析模型，本文建立了碳纤维增强复合材料（CFRP）渐进损伤子程序，对复合材料单钉单搭接连接件在拉伸荷载下的损伤演化过程进行数值模拟。具体研究内容及取得成果如下： （1）根据经典复合材料损伤理论的本构关系、失效准则和刚度变量，对三维Hashin失效准则进行了扩展，同时考虑摩擦力、螺栓预紧力、剪切非线性建立了三维渐进损伤失效分析模型；综合相关文献和试验结果，对数值模拟结果进行分析，结果表明本文建立的三维有限元模型可准确模拟复合材料螺栓连接件在单拉伸荷载作用下的破坏过程，可用于复杂结构的复合材料连接件的失效分析中。 （2）根据本文扩展的三维Hashin失效准则，运用“单元筛选法”开发了用于数值计算结果后处理的子程序，通过数据后处理与可视化分析，可更加直观地分析碳纤维增强层合板孔周边发生的起始损伤、裂纹扩展以及整体螺栓连接件最终失效的过程。 （3）对螺栓连接件的参数化分析，分别研究了复合材料铺层角度、接触面之间的摩擦因子 和螺栓预紧力对轻质复合材料螺栓孔周边应力分布和连接件失效模式的影响。并在给定连接件几何尺寸的情况下，对摩擦因子和螺栓预紧力进行优化设计，得到最优设计方案。结果表明：层合板中铺设角的铺层比例不同，将会导致连接件不同失效形式，在进行复合材料铺层设计时，应避免低强度破坏模式的发生；在复合材料螺栓连接预紧力推荐范围内，适度增大预紧力可提高复合材料螺栓连接强度；增大接触面之间的摩擦力可以有效减缓层合板螺栓孔周边的损伤失效进程。本文研究将为复合材料连接件的结构设计和优化提供理论依据。

The application of composites is an important symbol of the advanced materials in modern time, however, due to the anisotropy and low inter-ply strength of composite materials, the strength analysis of composite joints shows significant nonlinearity, which is different from that of metal materials. Therefore, it is of great significance to analyze the failure of composite bolt connectors. In order to establish an accurate numerical simulation model, the progressive damage subprogram of carbon fiber reinforced composites (CFRP) is compiled based on ANSYS software.The damage evolution process of composite single-joint under tensile load is studied numerically. The specific contents and results obtained are as follows: (1) Based on the the damage theory of composite material including constitutive relation, failure criterion and stiffness variable, the three-dimensional Hashin failure criterion is extended, and a three-dimensional progressive failure analysis model is eatablished considering the friction , bolt pretension and shear nonlinearity.The results showed that this 3D finite element model established in this paper can accurately simulate the failure process of composite single-bolt joint under tensile load, and can be used in failure analysis of complex composite structure bolt connections. (2) Based on the extended 3D Hashin failure criterion in this paper, a post-processing subprogram for data post-processing is developed using "element screening method". visual analysis of numerical simulation results The process of initial damage, crack propagation and ultimate failure of laminated plates during uniaxial tension can be analyzed more intuitively. (3) The progressive damage subroutine was debugged by APDL language in ANSYS, and the parametric analysis of bolt joint was completed to analysis the effects of lamination angle, friction coefficient between contact surfaces and bolt clamping load on the the bolt joint of lightweight composite laminated plates and metal plate according to analysis the stress distribution around bolt-hole and the failure mode of the joint. The results show that different proportion of laying angle in laminates will lead to different failure mode of composite material laminated plates. When designing the composite layer ,it’s better to prevent the low strength failure mode accoured.Within the range of recommended preloading force on the composite bolt joint, the joint strength of composite bolt can be enhanced by increasing the pretightening force appropriately. Increasing the friction coffefficient ( )between the contact surfaces can effectively slow down the damage and failure process around the bolt holes of laminated plates. This study will provide theoretical basis for structural design and optimization of composite joints.