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运用非线性有限元程序LS-DYNA对轴压下纵向开槽方形管的耗能能力进行研究。通过冲压作用开槽,在随后的碰撞试验中考虑了冲压作用中产生的有效塑性应变和厚度变化的分布。从模拟结果中可知:当在边墙中开槽时,一般钢管的耗能率将升高82·7%,钢管最大受力减少22·3%。对部分参数的影响进行了分析,包括钢管厚度、开槽长度和开槽数量,并且描述了开槽钢管变形模式的特征。研究发现:开槽可以有效提高薄壁结构的防撞性。
The nonlinear finite element program LS-DYNA was used to study the energy dissipation capacity of a longitudinally grooved square tube under axial compression. Slotting by stamping takes into account the distribution of changes in effective plastic strain and thickness produced during stamping in the subsequent crash test. From the simulation results, we can see that when slotted in the side wall, the energy consumption of ordinary steel pipe will increase by 82.7% and the maximum force of steel pipe will decrease by 22.3%. The influence of some parameters was analyzed, including the thickness of steel pipe, the length of slot and the number of slots, and the characters of the deformation mode of slotted steel pipe were described. The study found that: Slotting can effectively improve the crashworthiness of the thin-walled structure.