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Numerical simulation for drop impact of PET bottle
considering fluid-structure interaction |
| LI Qiang1, LIU Shu-lian 2, YING Guang-yao3, ZHENG Shui-ying1 |
1. Institute of Chemical Machinery, Zhejiang University, Hangzhou 310027, China; 2. School of Mechanices
and Automotive Engineering, Zhejiang University of Science and Technology, Hangzhou 310023, China;
3. Zhejiang Electric Power Test and Research Institute, Hangzhou 310014, China |
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Abstract With poly ethylene terephthalate (PET) bottle as the research object, the Johnson-Cook equation was chosen to analyze the ratedependent mechanical properties of PET after its relationship parameters were determined through the rate-dependent tensile experiments. The Euler description was adopted for the fluid domain, and for the structure domain the Lagrange method was used. The computation of the fluid-structure interaction was realized by the method of the MSC.Dytran coupling finite element and finite volume technique based on Lagrange and Euler scheme, and the simulation of the fluid-filled PET bottle in the crash was achieved. Based on numerical calculation, the mechanical behavior and energy conversation process of the PET bottle in the impact were analyzed. The stress time-history curves of contact element at different heights, von Mises stress distribution at various drop angles and the curves for maximum von Mises stress versus liquid quantity, bottle thickness during collision process were obtained, then the influences of drop height, drop angle, liquid quantity, and bottle thickness on the dropping impact characteristics of PET bottle were discussed. The calculation results indicate that with the increase of drop height and liquid quantity, the impact stress and damage of PET bottle increase. The impact stress shows a nonlinear relationship with the bottle thickness, and a strong difference with the drop angles.
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Published: 24 July 2012
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考虑流固耦合作用的PET瓶跌落碰撞数值仿真
以聚对苯二甲酸乙二醇酯(PET)瓶为研究对象,选用Johnson-Cook本构模型构建PET材料的率相关方程,并根据率相关拉伸实验确定Johnson-Cook方程中的参数.采用Euler法描述流体方程,Lagrange法描述结构方程,应用动力学软件MSC.Dytran中基于混合的Lagrange格式和Euler格式的有限单元和有限体积技术实现流体和结构的耦合作用,完成了贮液PET瓶跌落碰撞过程的数值仿真计算.通过计算,分析PET瓶在碰撞冲击过程中力学行为和能量转化过程,得到碰撞过程中PET瓶底部接触单元不同高度的等效应力时程曲线和最大等效应力随跌落角度、贮液量和壁厚的变化关系,从而分析比较不同跌落高度、跌落角度、贮液量及PET瓶壁厚对PET瓶跌落冲击特性的影响.计算结果表明:随着跌落高度和贮液量的增大,PET瓶所受冲击应力和损伤逐渐增大；冲击应力与壁厚为非线性关系,而与跌落角度呈现强差异性.
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