薄膜超弹性本构模型及其在空气垫中的应用

A Hyperelastic Constitutive Model for Membrane and Its Application in Air Cushion

为了在有限元分析中精确地描述空气垫的力学行为,研究了空气垫聚合物薄膜的本构模型及其在空气垫缓冲性能分析中的应用.基于聚合物薄膜的单向拉伸试验,提出了一种可压缩超弹性本构模型,并通过数据拟合,获得了本构模型的参数.通过空气垫静态压缩试验和模拟的对比,验证了本构模型的适用性,并将此聚合物薄膜的本构模型应用到空气垫的有限元参数分析中,分析了充气压力对空气垫性能的影响.

In order to accurately describe the mechanical behavior of air cushion in finite element analysis, a constitutive model for polymer membrane was developed and applied to study the cushioning properties of air cushion. Based on uniaxial tensile tests of the polymer film, a compressible hyperelastic constitutive model was proposed. Material parameters were obtained by curve fitting. The model was validated by implementing numerical simulations on compression test of one column of the air cushion. Comparisons between simulation results and experimental data show that the proposed hyperelastic model can effectively characterize the nonlinear material behavior of the polymer membrane. The model was further applied to analyze the influence of inflation pressure on the performance of the air cushion. The development of the hyperelastic constitutive model is critical to the numerical simulation and design optimization of air cushion packaging.