目的 通过对LS-DYNA中M57和M83模型标定,确定不同工况条件下适用于EPS发泡材料的仿真模型,并应用于液晶显示屏EPS包装箱搬运及斜面冲击仿真。方法 对EPS发泡材料进行压缩和拉伸试验,采用LS-DYNA中M57和M83模型分别进行压缩和拉伸试验仿真,通过对比压缩和拉伸力-位移曲线,来确定适用于EPS发泡材料的仿真模型。选择不同工况下的较优模型,在LS-DYNA中对液晶显示屏包装进行搬运及斜面冲击仿真分析。结果 应变率为0.001 s-1时,M57和M83模型压缩仿真误差分别为0.9%和2.1%;拉伸仿真误差分别为25.5%和5.9%;应变率为1 s-1时,压缩仿真误差分别为1.1%和4.1%;拉伸仿真误差分别为41%和14.2%。采用M57模型对EPS包装箱进行搬运仿真,挠度误差为8.8%。采用M83模型对整托EPS包装箱进行斜面冲击仿真,冲击应力大于材料拉伸断裂应力,包装箱角部出现开裂,开裂位置与试验开裂位置吻合。结论 M57较M83能更好预测EPS的压缩力位移变化;M83较M57能更好预测EPS的拉伸力位移变化。
Abstract
The work aims to identify the simulation models suitable for expanded polystyrene (EPS) foaming materials under various working conditions through the calibration of the M57 and M83 material models in LS-DYNA and subsequently apply the models to the simulation of EPS packaging boxes for liquid crystal displays in handling and inclined plane impact scenarios. Compression and tensile tests were conducted on EPS foaming materials. The M57 and M83 models in LS-DYNA were employed to simulate compression and tensile tests, respectively. By comparing the simulated force-displacement curves with experimental data, the most appropriate simulation model for EPS foaming materials was determined. Based on this analysis, optimal models for different loading conditions were selected and used to perform handling and inclined impact simulations of liquid crystal display packaging within LS-DYNA. At a strain rate of 0.001 s-1, the compression simulation errors for the M57 and M83 models were 0.9% and 2.1%, respectively, while the tensile simulation errors were 25.5 % and 5.9%. At a strain rate of 1 s-1, the compression simulation errors were 1.1% and 4.1%, respectively, and the tensile simulation errors were 41% and 14.2%. Handling simulations of the EPS packaging box using the M57 model resulted in an 8.8% deflection error. The M83 model was utilized for inclined impact simulations of EPS packaging boxes in the entire pallet. The resulting impact stress exceeded the tensile fracture stress of materials, leading to crack formation at the corners of the packaging box. These crack locations corresponded closely with those observed in physical tests. The M57 model demonstrates superior accuracy in predicting compressive force-displacement behavior of EPS compared to the M83 model. Conversely, the M83 model provides better prediction of tensile force-displacement characteristics than the M57 model.
关键词
EPS发泡材料 /
仿真模型标定 /
搬运仿真 /
斜面冲击仿真
Key words
EPS foaming material /
calibration of simulation model /
simulation of handling operations /
inclined impact simulation
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