扁长杆的冲击弹塑性屈曲特性分析的仿真有限元模型

发布时间：2018-07-16 21:17

【摘要】：已有文献进行了微弓形扁长金属杆在轴向重物冲击下的动态屈曲实验研究,得到了扁长杆冲击屈曲响应的典型结果,但已有文献及后来相关论文的模拟计算精度较低。为了提高典型扁长杆的冲击屈曲特性的计算分析精度,该文研究了扁长杆的冲击屈曲特性分析的有限元建模方法,改进了有限元模型边界条件的建模仿真度(考虑了转动铰配合间隙、摩擦等),并探讨了有限单元型式及尺度的选择,以壳单元或实体单元模型代替梁单元模型。研究表明:采用改进边界条件(考虑转动铰配合间隙、摩擦等)和薄壳单元或厚壳单元或实体单元的仿真模型比采用理想边界条件和梁单元的原模型的计算结果精度显著提高;基于改进模型的计算分析结果,揭示了该扁长杆受冲击载荷作用时的3维动态反向屈曲行为。
[Abstract]:The experimental study of dynamic buckling of microarched long metal bars under axial impact has been carried out, and the typical results have been obtained. However, the simulation accuracy of the previous literatures and related papers is relatively low. In order to improve the accuracy of calculation and analysis of the impact buckling characteristics of a typical flat long rod, the finite element modeling method for the analysis of the impact buckling characteristics of the flat long rod is studied in this paper. The modeling fidelity of the boundary condition of finite element model is improved (including rotation hinge clearance friction etc.) and the selection of finite element type and scale is discussed. The shell element or solid element model is used to replace the beam element model. The results show that the accuracy of the simulation model using the improved boundary condition (considering the clearance of the rotary hinge, friction, etc.) and the thin shell element or thick shell element or solid element is significantly higher than that of the original model using the ideal boundary condition and the beam element. Based on the results of calculation and analysis of the improved model, the three-dimensional dynamic reverse buckling behavior of the flat long rod subjected to impact load is revealed.
【作者单位】：清华大学汽车工程系;
【分类号】：O344.1

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