泡沫铝部分填充薄壁梁弯曲吸能特性研究

Energy-absorption Properties of Foam-filled Part Thin Shell Subjected to Bending

为了研究泡沫铝填充帽型薄壁梁横向弯曲时的吸能特性,建立了泡沫铝填充双帽型薄壁梁的有限元模型,采用非线性有限元软件LS-DYNA进行了横向弯曲工况下的仿真。首先进行了空心帽型薄壁梁和泡沫铝填充帽型薄壁梁的横向弯曲仿真,分析了材料参数、几何参数对其比吸能(单位质量吸收的能量)的影响;然后为降低结构重量并保持薄壁梁吸能效果,对部分填充泡沫铝薄壁梁进行了横向弯曲仿真,考察了不同泡沫铝填充长度对结构吸能特性的影响。研究结果表明:填充泡沫铝后,帽型薄壁梁在横向弯曲中吸能特性有明显的改善;在吸收相同的能量时,泡沫铝填充薄壁梁的质量要比空心薄壁梁的质量少。

Finite element models for aluminum foam - filled double hat sections were developed by using Hypermesh, and transverse bending simulations were carried out via non - linear FE software LS - DYNA. Energy - absorption properties of aluminum foam - filled part subjected to bending were obtained. First, bending simulations of empty and aluminum foam -filled hat sections were performed, and the effects of material parameter, geometry pa- rameter on SEA （mass Specific Energy Absorption） were discussed. Then partial foam -filled hat sections subjected to bending were simulated to reduce the structure mass while maintaining the energy absorption properties, the effect of the length of aluminum foam - filled part on energy - absorption properties of structures was discovered. Analysis shows that there is an improvement of the energy absorption properties after aluminum is foam - filled, less mass is needed for the aluminum foam -filled structures to absorb the specific energy compared to the empty structure.