泡沫EPS非线性粘弹性本构模型在LS-DYNA空调跌落仿真中的研究

目的 研究泡沫EPS非线性粘弹性本构模型对空调跌落仿真精度的影响。方法 通过动态压缩试验获得泡沫EPS在不同应变率下的应力-应变结果，使用LS-DYNA中的非线性粘弹性本构模型Fu-Chang泡沫准确模拟泡沫在不同应变率下的力学性能，并通过空调跌落仿真进行验证。结果 使用不同应变率下的泡沫EPS非线性粘弹性本构模型进行仿真，空调不同位置的仿真加速度曲线和实际试验加速度曲线相似度在90%以上。结论 不同应变率下的泡沫EPS非线性粘弹性本构模型可以准确模拟EPS泡沫在动态冲击下的材料力学性能，可以更加准确地模拟跌落工况中空调结构的动态反应及泡沫失效状态，提高仿真精度。

Nonlinear Viscoelastic Constitutive Model of Foam EPS in LS-DYNA Air Conditioner Drop Simulation

The work aims to study the influence of foam EPS nonlinear viscoelastic constitutive model on the accuracy of air conditioner drop simulation. The stress-strain results of foam EPS at different strain rates were obtained through dynamic compression tests. The nonlinear viscoelastic constitutive model Fu-Chang foam in LS-DYNA was used to accurately simulate the mechanical properties of the foam at different strain rates, and verified by air conditioner drop simulation. By using foam EPS nonlinear viscoelastic constitutive model under different strain rates for simulation, the similarity between the simulated acceleration curve and the actual test acceleration curve of different locations of the air conditioner was more than 90%. The EPS foam nonlinear viscoelastic constitutive model under different strain rates can accurately simulate the mechanical properties of EPS foam under dynamic impact, and can more accurately simulate the dynamic response of air conditioner structures and the state of foam failure under drop conditions, to improve simulation accuracy.