基于连续介质损伤模型的复合材料连接件失效分析  

Failure Analysis of Composite Pinned Joints Based on Continuum Damage Mechanics

作　　者：拓宏亮 马晓平[1,2] 卢智先 Tuo Hongliang;Ma Xiaoping;Lu Zhixian(School of Aeronautics,Northwestern Polytechnical University,Xi′an 710072,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]西北工业大学航空学院,陕西西安710072 [2]中国科学院工程热物理研究所,北京100190

出　　处：《西北工业大学学报》2018年第5期848-855,共8页Journal of Northwestern Polytechnical University

基　　金：中央高校基本科研专项资金(3102017zy046)资助

摘　　要：对4种不同铺层顺序的复合材料销钉连接件进行了挤压试验,得到复合材料销钉连接件的挤压强度和弦向挤压刚度,分析了载荷方向偏角对失效模式、挤压强度和弦向挤压刚度的影响规律。基于连续介质损伤力学理论,建立了复合材料销钉连接件在挤压载荷下的三维非线性数值模型,其中,采用最大应变准则预测纤维损伤的萌生,损伤演化规律则采用双线性损伤本构关系。基于物理失效机制的Puck准则对基体损伤的起始进行判定,根据断裂面内的等效应变表征基体损伤的扩展。该模型还考虑了剪切非线性和就地强度效应对挤压强度和损伤扩展的影响。基于此模型分析了销钉连接件在挤压载荷下的失效模式、挤压强度和弦向挤压刚度。试验结果和计算结果较好吻合,验证了模型的准确性和适用性。The paper conducted bearing tests on composite pinned joints with four different stacking sequences.The bearing strength and bearing chord stiffness were obtained.The influence of stacking sequences on failure modes,bearing strength and bearing chord stiffness was discussed.Based on continuum damage mechanics,a three-dimensional finite element model of composite pinned joint under bearing load was built,where the maximum strain criterion was employed for initiation and bi-liner damage constitutive relation for revolution of fiber damage,while the physical-based Puck criterion was used for matrix damage initiation,and matrix damage revolution depended on the effective strain on the fracture plane.The failure mode,bearing strength and bearing chord stiffness of composite pinned joint were discussed with this model under which the non-linear shear behavior and in-situ strength effects were considered.Good agreements between test results and numerical simulations validates the accuracy and applicability of the finite element model.

关 键 词：复合材料 销钉连接 挤压强度 连续介质损伤力学 损伤扩展 有限元模型 

分 类 号：TB322[一般工业技术—材料科学与工程]