Finite element analysis of dynamic compression response of trapezoidal polyethylene foam structure
LU Fude1,HUA Guangjun1,WANG Lishu1,LIU Qilong1,GAO De2
1. School of Packaging and Material Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China;
2. Ningbo Institute of Technology,Zhejiang University,Ningbo Zhejiang 315100,China
Abstract:The existing five-step method of cushioning packaging is limited to the design and calculation of the area and thickness of cuboid structure, but this method can not be used in trapezoidal structure design.In order to study the dynamic compression response of trapezoidal structure and provide the basis for design, a series of experiments and theoretical analysis were carried out on the trapezoidal structure of expanded polyethylene.Based on the low density foam constitutive model in ABAQUS, a two-dimensional finite element model was established.Then, on the basis of one-dimensional dynamic constitutive relation of expanded polyethylene, the dynamic compression response of trapezoidal expanded polyethylene structure was analyzed by virtual mass method.The numerical simulation results showed that the two-dimensional finite element model can accurately obtain the mechanical behavior and deformation mode of any trapezoidal foam structure.When the virtual mass method is used to analyze the mechanical response of gradient structure, the analysis error increases with the increase of taper of trapezoidal foam, which is caused by the uneven deformation of trapezoidal foam structure.So the virtual mass method has high accuracy in solving the dynamic response of foam structures only with small taper.
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