多胞方管吸能特性仿真与响应面优化分析

Simulation and optimize study on the energy absorption characteristics of unit cell tube

为提高薄壁结构的吸能特性,应用非线性有限元法和响应面法优化分析晶胞数目、薄壁管长度和壁厚对比吸能的影响,对优化后的五晶胞管采用孔洞缺陷的方法降低初始峰值载荷,分析得出:多晶胞方管的比吸能优于薄壁方管,且初始峰值载荷和比吸能也随着提高;优化后的五晶胞管比吸能为26.77 kJ/kg,比之前提高15.6%;用孔洞缺陷的方法使优化后的五晶胞管初始峰值载荷降低14.6%。表明:通过响应面优化,孔洞缺陷设计出的五晶胞管具有良好的吸能特性。

Thin-walled structures have been extensively used as energy absorbing components in industry.However,it remains challenging to decide best possible structural configurations.In this paper,we select thin-walled square tube as the research object,and the specific energy absorption and initial peak load as the evaluation index.We use nonlinear finite element method to study the energy absorption characteristics of different unit cell tube.At the same time,the length,thickness of the tube is analyzed based on the response surface method.And finally,we use hole defects methodology to reduce the initial peak loads of the optimized lattice tube.The results showed that the specific energy absorption of multi-cell square tube is higher than thin-walled square tube,as the unit cell number increases,the initial peak load and specific energy absorption also rise,the specific energy absorption of the optimized Unit cell tube is 26.77 kJ/kg and is 15.6%higher than before,the initial peak load of the five Unit cell tube optimized reduce 14.6%by using hole defects methodology.The five Unit cell tube designed by using response surface optimization and whole defects has a good energy absorption characteristics.