目的 在运输过程中,包装材料受到的冲击无法避免。在冲击仿真时,对材料属性目前仅考虑压缩本构模型,仿真精度较低,为提升冲击仿真的准确性与精度,针对EPE同时构建了压缩和拉伸本构模型。方法 基于压缩和拉伸的试验应力-应变曲线,构建压缩和拉伸本构模型。通过ABAQUS中的Low-density foams模块对不同高度下（300、450、600 mm）结构样的面、棱和角进行跌落仿真分析,与结构样的试验结果进行对比。结果 在不同高度的面、棱、角跌落下,仅考虑压缩本构的仿真结果与实验结果对比误差范围为8.09%~30.80%,同时考虑压缩和拉伸本构的仿真结果与实验结果对比误差范围为1.30%~4.86%。结论 在跌落试验中,不能忽略拉伸变化对EPE材料力学性能的影响。因此,在进行跌落仿真分析时,将材料的拉伸本构纳入考量,有助于提升工程应用分析的准确性。
Abstract
In transport packaging, the impact of packaging materials is unavoidable. In impact simulation, only the compression constitutive model is currently considered for material properties, resulting in relatively low simulation accuracy. The work aims to construct a compression and tensile constitutive model for EPE to improve the accuracy of material impact simulation. The compression and tensile constitutive models were constructed based on the experimental stress-strain curves of compression and tensile. The face, edge and angle drops at different heights (300 mm, 450 mm and 600 mm) were simulated and analyzed by experiment combined with the low-density foams module in ABAQUS. For face, edge, and corner drops at different heights, simulations considering only the compressive constitutive behavior showed an error range of 8.09%-30.80% compared with experimental results, while simulations considering both compressive and tensile constitutive behaviors showed a significantly reduced error range of only 1.30%-4.86%. Including tensile constitutive behaviors in simulation analysis can reduce discrepancies between simulation results and experimental data. Therefore, considering the tensile constitutive properties of materials in actual drop simulations can help improve the accuracy of engineering analyses.
关键词
发泡聚乙烯 /
压缩本构 /
拉伸本构 /
有限元仿真
Key words
expanded polyethylene /
compressive constitutive /
tensile constitutive /
finite element simulation
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