基于低能量冲击损伤阻抗的复合材料薄壁结构铺层顺序设计

建立了有效的复合材料层合板结构冲击损伤分析方法，层合板面内损伤采用改进的Chang/Chang 失效准则做判据，得到面内各类损伤形式。层间损伤采用与Mixed-Mode粘接元等效的TIEBREAK接触模拟。利用此分析方法，从复合材料薄壁结构设计需要出发，研究了在低能量冲击下，铺层的层间角度、铺层方向、铺层重叠对层合板结构冲击损伤阻抗的影响规律，并对它们的综合影响进行了总体分析，得到了能提高层合板结构损伤阻抗的铺层顺序设计指导。最后用该设计指导对某种铺层结构进行了重新设计和有限元模拟，验证了该设计指导的可行性和有效性。

Stacking sequence design of composite thin-walled structure based on low energy impact damage resistance

An effective method was established for damage analysis of composite laminated plate. Improved Chang/Chang failure criterion including all kinds of damage forms was used to model in-plate damage. TIEBREAK contact equivalent of Mixed-Mode cohesive zone model was used for modeling the regions between two layers. From composite thin-walled structure design requirement, three parameters of stacking sequence affecting impact damage resistance under low energy impact were studied with the numerical method, i.e, interface angel, ply orientation and ply grouping. After general study of the effects of stacking sequence on the impact resistance, some design guidelines to improve the impact damage resistance of composite plates were given, and the stacking sequence of a composite laminated plate was redesigned according to the guidelines. The finite element analysis shows that the guidelines are feasible and valid.