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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Significance of material constitutive model and forming parameters on the crashworthiness performance of capped cylindrical tubular structures
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Significance of material constitutive model and forming parameters on the crashworthiness performance of capped cylindrical tubular structures

机译：材料本构模型和成形参数对加盖圆柱管状结构耐撞性能的意义

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An accuracy of crushing performance indicators is critical to evaluate in finite element crushing simulations particularly for the press-formed capped tubular energy absorbing structures. It is essential to select the appropriate material constitutive model and to incorporate the forming parameters into the finite element crushing model as a vital input. Hence in the present article, the influence of various material constitutive models and forming (multi-stage deep drawing) parameters on the axial crashworthiness characteristics of thin-walled capped cylindrical tubes were investigated numerically. Both forming and crushing simulations were executed by nonlinear finite element LS-DYNA (R) code. The forming parameters such as thickness distribution, residual stress, and effective plastic strain were mapped to a finite element crushing model of the tube. The numerical predictions of the thickness distribution and final deformed profiles of the capped cylindrical tubes are correlated with the experiments. The results revealed that the forming parameters have a substantial effect on the crushing performance of the deep drawn capped cylindrical tubes. As a result of these analyses, the thickness and strain predictions strengthens the tube and significantly influenced the crushing performance indicators such as initial peak crushing force, mean crushing force, and the energy absorbing capacity.
机译：压碎性能指标的准确性对于评估有限元压碎仿真至关重要，特别是对于压制成型的带盖管状吸能结构而言。选择合适的材料本构模型并将成形参数纳入有限元破碎模型是至关重要的输入。因此，在本文中，数值研究了各种材料本构模型和成形（多阶段深冲）参数对带盖薄壁圆筒管轴向耐撞性的影响。成形和破碎模拟均通过非线性有限元LS-DYNA（R）代码执行。诸如厚度分布，残余应力和有效塑性应变的成形参数被映射到管的有限元破碎模型。带帽圆柱管的厚度分布和最终变形轮廓的数值预测与实验相关。结果表明，成形参数对深拉盖圆柱管的破碎性能有很大影响。这些分析的结果是，厚度和应变预测增强了管子的强度，并显着影响了破碎性能指标，例如初始峰值破碎力，平均破碎力和能量吸收能力。

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