双模量泡沫材料等效弹性模量的细观力学估算方法

Meso-Mechanical Method for Estimating Equivalent Elastic Modulus of Foam-Solid with Double-Modulus

目前常用的泡沫材料力学模型均不能反映出该材料的拉压双模量效应。因此,本文在分析泡沫材料拉、压变形力学机制的基础上,建立了一种可以反映泡沫材料拉压双模量效应新的细观力学模型,分别推导了泡沫材料等效拉伸和等效压缩Y oung′s模量的估算公式。此外,本文通过泡沫材料的单向拉伸、压缩试验,完成了泡沫材料拉压双模量效应的试验验证。估算公式的预测与试验结果的比较表明:理论估算公式的计算结果满足工程所要求的精度。

The double-modulu effect of foam-solid isn＇t included in the existing mechanical models. Therefore, a new meso-mechanical model, for characterizing the double-modulus effect of foam-solid, is established by stretching and compressing deformation mechanism of the foam-solid. Based on this model, two formulas for estimating the equivalent stretching and compressive Young＇s modulus are derived. A group of uniaxial stretch/compress experiments is completed to certify the double-modulu effect of the foam-solid. Compared with experimental results, the prediction given by two estimating formulas meets the demand of the engineering accuracy.