复合材料蜂窝夹芯板冰雹冲击及多次冲击数值研究

Numerical Study on Single and Repeated Impact of Hail on Composite Honeycomb Sandwich Panels

复合材料夹芯结构在受到冰雹冲击后会产生损伤,降低结构的承载能力。目前,针对冰雹冲击则主要针对层合板结构,而对复合材料夹芯结构的冰雹冲击,尤其是多次冲击问题则研究较少。针对碳纤维复合材料蜂窝夹芯板,进行了冰雹冲击及多次冲击数值研究。基于连续介质损伤力学,建立了三维精细有限元模型。考虑了碳纤维复合材料面板的层内和层间损伤、蜂窝芯材胞壁六边形结构以及冰雹的应变率效应和损伤。模拟计算了夹芯板在冰雹冲击下的力学响应和材料破坏,分析了面板和芯材在冲击过程中的损伤演化和相应的损伤机理。在此基础上,针对多次冲击工况,分析了不同冲击能量、冲击角度以及冲击位置的多次冲击损伤,以及在冰雹多次冲击下的损伤累积和叠加。研究发现,在多次冲击下,冲击能量、角度和位置对损伤累积存在明显影响。

Composite sandwich structures are susceptible to hail impact damage which is resulted in reduction of load capacity.At present,most studies on hail impact are related to composite laminates,while few work focuses on hail impact on the composite sandwich structures,especially repeated impact events.This paper provides numerical investigation on the low-velocity impact of hail ice on honeycomb sandwich panels with composite face sheets.A refined three-dimensional finite element model combined with continuum damage mechanics(CDM)is developed with consideration of intralaminar and interlaminar damage of face sheet,the hexagonal honeycomb cells as well as strain rate effect and damage of hail ice.Dynamic response and material damage are obtained.The damage evolution and mechanism of face sheet and honeycomb core are analyzed during impact process.On this basis,the influence of impact energy,impact angle and impact positions on the damage accumulation for repeated impact are studied.It is found that the impact energy,impact angle and impact positions can greatly affect impact damage.