纤维增强复合材料分层损伤失效模拟计算方法

Delamination Damage Algorithm of Fiber Reinforced Composites

针对纤维增强复合材料最典型的分层损伤破坏模式,研究了现阶段冲击动力学仿真计算中常用的复合材料本构模型及失效准则,分析了内聚力单元模型算法与固连失效接触模型算法各自的原理及特点。内聚力单元算法应用了损伤力学和断裂力学,不需要假设初始损伤位置。而固连接触算法将接触面上的从节点集与目标接触面中的表面粘接在一起,当达到失效条件后,从节点集与目标接触面中的表面发生滑动或者分离。针对两种纤维增强复合材料靶板的抗侵彻性能进行仿真计算,通过仿真计算与靶试验证得出,内聚力单元算法及固连接触算法均能较好地模拟纤维增强复合材料的分层损伤破坏模式,揭示了纤维增强复合材料抗侵彻过程中的防护机理,为新型复合防护结构及装备的研制与设计提供重要参考。

Aiming at the typical delamination damage mode of fiber-reinforced composites,the constitutive model and failure criterion of composites that commonly used in dynamic simulation were studied,and the principles and characteristics of cohesive element and tiebreak contact algorithm were analyzed.The cohesive element algorithm use damage mechanics and fracture mechanics,and did not need to assume the initial damage location.Thetiebreak contact algorithm would bond the slave node set with the surface in the target.When the failure condition was reached,the slave node set would slide or separate from the target surface.Then the simulation calculation of two fiber-reinforced composite targets anti penetration is take as an example.The accuracy of the cohesive element and the tiebreak contact algorithm are verified respectively,and the protection mechanism of fiber-reinforced composites in the process of anti penetration is revealed,which provides an important reference for the development and design of new composite protection structures and equipment.