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中文摘要：
针对采用格栅结构的某无人机机翼,研究了机翼格栅结构在承受低速冲击下结构材料的损伤特性;在ABAQUS软件中建立了冲击损伤过程有限元模型,采用Hashin-Rotem应变失效准则和Camanho参数退化方式,对无穿透破坏前提下的单侧带蒙皮格栅结构进行了冲击仿真实验。研究了针对不同格栅结构构型、不同冲击位置、不同冲击能量等情况下的损伤特性。结果表明：对结构不同位置进行冲击时,结构损伤类型、面积、扩展特性等都有极大的不同,而且复合材料结构不同铺层的损伤特性也有很大差异;验证了格栅结构对损伤扩散具有良好的限制能力,表明格栅结构具有很好的抗损伤能力。
英文摘要：
Research on damage characteristics of composite grid structures for unmanned aircraft wing under low velocity impact was presented in this paper.The composite grid structures were modeled in finite element analysis software ABAQUS.Then simulation analysis,in which the model was subjected to low velocity impact with the assumption of no penetration,was carried out by employing Hashin-Rotem strain failure criteria and Camanho Parameter degradation mode under different conditions,such as different grid shapes,different impact locations,different impact energies,et al.Simulation results show that the damage characteristics vary greatly with different impact locations,such as damage types,damage areas,damage propagation directions,et al.It also proves that grid structures have significantly resistance performances to damage propagation and failures.
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