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在当前的研究中,常使用显式有限元程序LS-DYNA3D研究所选材料特性对受面内压缩荷载的复合夹芯板碰撞能量吸收特性的影响。国立雅典理工大学(NTUA)对各种复合夹芯板在静态边缘压力试验中的倒塌失效模式进行了研究,而本研究则首先尽可能精确地模拟了与其相对应的代表性试验,所选的复合夹芯板的材料用于交通工具的前端保险杠。之后,通过精确地复制这种倒塌失效模式研究所选面板和泡沫芯层材料特性对受面内压缩荷载的复合夹芯板碰撞能量吸收特性的影响。为此建立几个系列的有限元模型,通过改变最初的有限元模型中材料参数的数值来模拟夹芯板的倒塌失效模式。通过这些有限元模型得出的结果来创建材料特性对能量特性影响的图表。此外,对模拟结果进行分析,通过各种简单的线性函数或多项式函数来表达碰撞能量吸收特性与夹芯板材料参数的关系。这些研究可为复合夹芯板防碰撞的设计提供参考。
In the present study, the explicit finite element program LS-DYNA3D is often used to investigate the effect of selected material properties on the energy absorption characteristics of a composite sandwich panel subject to in-plane compressive loading. At the National University of Athens (NTUA), the collapse failure modes of various composite sandwich panels under static edge pressure tests were investigated. In the present study, the representative experiments corresponding to them were simulated as accurately as possible. The material of the composite sandwich panel is used for the front bumper of a vehicle. Then, by accurately replicating this collapse failure mode, the effect of the selected panel and foam core material properties on the energy absorption characteristics of the impact of the composite sandwich panel subjected to in-plane compressive loading was investigated. For this purpose, several series of finite element models were established and the failure modes of sandwich panels were simulated by changing the values of material parameters in the initial finite element model. The results obtained from these finite element models create a graph of the impact of material properties on energy characteristics. In addition, the simulation results are analyzed and the relationship between the collision energy absorption characteristics and the material of the sandwich panel is expressed by various simple linear functions or polynomial functions. These studies can provide a reference for the design of anti-collision of composite sandwich panels.