J4  2012, Vol. 46 Issue (6): 980-986    DOI: 10.3785/j.issn.1008-973X.2012.06.004
 计算机技术

1. 浙江大学 化工机械研究所,浙江 杭州 310027; 2. 浙江科技学院 机械与汽车工程学院,浙江 杭州 310023;
3. 浙江省电力试验研究院,浙江 杭州 310014
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 ratedependent 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.

 : TP 391.9