基于连续损伤力学的复合材料多钉连接失效分析和试验研究  

FAILURE ANALYSIS AND EXPERIMENTAL STUDY OF COMPOSITE MULTI-PIN CONNECTIONS BASED ON CONTINUUM DAMAGE MECHANICS

作　　者：李玺 李亚智[2] 磨承杰 覃群[1] 陈宏 LI Xi;LI YaZhi;MO ChengJie;QIN Qun;CHEN Hong(Guangxi Technological College of Machinery and Electricity,Nanning 530007,China;Northwestern Polytechnical University,Xi’an 710072,China;Aircraft Strength Research Institute of China,Xi’an 710065,China)

机构地区：[1]广西机电职业技术学院,南宁530007 [2]西北工业大学,西安710072 [3]中国飞机强度研究所,西安710065

出　　处：《机械强度》2022年第4期911-920,共10页Journal of Mechanical Strength

基　　金：国家自然科学基金项目(11602237);广西高校中青年教师科研基础能力提升项目(2022KY1070);广西机电职业技术学院科研项目(2021YKYZ002)资助。

摘　　要：针对复合材料多钉连接结构在拉伸载荷作用下的失效和损伤进行数值分析和试验研究。首先,针对纤维、基体和分层三种不同形式的损伤建立不同的失效判据并基于断裂力学推导出考虑原位效应的单层板强度参数,结合刚度幂指数衰减方法,使用有限元子程序编写复合材料单层板的连续损伤力学本构模型。在计算Puck准则中的基体失效断裂面角度时,为了提高计算效率,提出使用区别于传统的Puck遍历法和分区黄金分割法的分区牛顿法进行计算。其次利用上述力学模型对复合材料层合板平板和开孔板进行拉伸性能分析并对比试验结果,验证模型可行性。最后对复合材料多钉连接结构的失效和损伤演化过程进行有限元分析,对比计算结果与试验结果表明:提出的连续损伤力学模型,能够较好的预测碳纤维复合材料多钉连接结构在拉伸载荷作用下的强度和损伤。Composite multi-pin connection is a common connection form in engineering structure.In this paper,numerical analysis and experimental study on the failure and damage of composite multi-pin connection structure under tensile load are carried out.Firstly,different failure criteria are established for fiber,matrix and delamination.Based on fracture mechanics,the strength parameters of single-layer plate considering in-situ effect are derived.Combined with the method of stiffness exponential decay,the continuous damage mechanical constitutive model of composite single-layer plate is compiled by using finite element subroutine.In order to improve the calculation efficiency,this paper proposes to use the partition Newton method,which is different from the traditional Puck method and the partition golden section method,to calculate the angle of matrix failure fracture surface in Puck failure criterion.Secondly,the tensile properties of composite laminate plate and perforated plate are analyzed by using the above mechanical model,and the feasibility of the model is verified by comparing the test results.Finally,the failure and damage evolution process of the composite multi pin connection structure is analyzed by using the above mechanical model,and the results are compared with the experimental results.The results show that the mechanical model proposed in this paper can predict and calculate the mechanical response and damage mode of carbon fiber composite multi-pin connection structure under tensile load.

关 键 词：原位效应 失效准则 分区牛顿法 力学试验 复合材料 

分 类 号：TB332[一般工业技术—材料科学与工程]