摘要
为计算复合材料厚板在三维应力状态下的极限承载,综合考虑复合材料厚板的三维应力特性和厚板的本构理论,基于非线性本构关系与增量步迭代法,以Hashin 3D失效准则为单层板失效判据;当层压板中有一层或多层被检测到失效时,对失效层进行刚度折减,并在增量过程中不断更新刚度矩阵。同时,对航空结构件中使用的复合材料厚层压板进行了双轴载荷下的渐进失效过程模拟,分别计算了两种碳纤维环氧复合材料单向带在两种铺层形式以及三种载荷工况下的初始失效和极限承载包线;并给出了不同的铺层和材料组合下层压板的初始失效与最终失效强度包线及每一段所代表的失效模式,展示了层压板的渐进失效过程。本文研究方法解决了对复合材料厚层压板失效过程状态的跟踪与判定问题,同时又不必去建立复杂的三维有限元模型,减小了计算量。
An incremental solution method is proposed based on thick laminate theory coupled with nonlinear constitutive model for progressive failure analysis of thick composite laminates under biaxial load.Three dimensional Hashin criterion is employed to predict the failure of individual ply in the laminates.Degradation is applied when failure is predicted and the stiffness of laminates is updated step by step during the incremental solution.The initial failure and final failure envelop are acquired with varied materials,lay-up and load-ratio,which demonstrated the process of progressive failure well and is of great significance for the investigation of the failure and failure process of thick composite laminates under biaxial load.
出处
《应用力学学报》
CAS
CSCD
北大核心
2012年第5期559-565,629,共7页
Chinese Journal of Applied Mechanics
关键词
非线性本构
厚板理论
刚度折减
渐进失效
强度包线
双轴
nonlinear constitutive model,thick laminate theory,stiffness degradation,progressive failure,failure envelope,biaxial load