复合材料波纹梁吸能能力的数值模拟

 运用MSC/DYTRAN有限元软件,对3组不同尺寸的碳纤维—环氧树脂圆弧形波纹梁的破坏过程、峰值载荷和能量吸收能力进行了数值模拟研究。由于MSC/DYTRAN有限元软件不能直接用于复合材料的吸能分析,分析时采用了等效的方法。比较波纹梁的计算结果与准静态轴向压溃试验的结果可见,两者较为一致。在此基础上分析了波纹梁的耐撞性,得到波纹梁在碰撞过程中的吸能数据,进一步研究了不同薄弱环节设置对波纹梁峰值载荷的影响。说明采用了等效的方法并运用该有限元软件来模拟复合材料结构的吸能能力是可行的。

Numerical Simulation of Energy Absorption Capability of Composite Waved Beams

The crash processes,peak loads and energy absorption properties of three sets of waved beams with different sizes are analyzed with the explicit finite element code MSC/DYTRAN. Equivalent method is used in the modeling since the FEM code does not have the capability to analyze the energy absorption behavior of composite material. Numerical results of waved beams are compared with the experimental results under quasi-static compressive loads to failure. Good correlation is observed. Based on the above model, the crashworthiness of the waved beam is studied and the data of energy absorption are obtained. In addition, the effects of different settings of trigger mechanism on the peak load are further investigated. One may conclude that it is possible to analyze the energy absorption capability of composite structure by using the MSC/DYTRAN together with the equivalent method.