EPS压缩蠕变的应力与密度的相依性

室温下,对三种密度的聚苯乙烯泡沫(EPS)进行了不同应力水平下的单轴压缩蠕变实验,结果表明,蠕变随应力的增大而增大,随密度的增大而减小。利用粘弹性力学理论,根据弹性-粘弹性对应原理,使用求解粘弹性问题的积分变换方法(Lap lace逆变换),建立了包含密度和应力影响的EPS压缩蠕变模型。分析对比实验曲线和理论模型得到的结论,二者图形趋势较为一致,所以该模型可以反映密度和应力水平对EPS压缩蠕变的影响,可以用来描述EPS的压缩蠕变。

The Correlation of the Stress and the Density of the EPS Compression Creep

A series of uniaxial compression creep experiments under the different stresses were carried out for three kinds of density EPS sample at room temperature.The result shows that the creep increases with increasing the stress and decreases with increasing the density.With integral transformation method of solving viscoelastic problem(Laplace transform inversion),the compression creep medel of Expanded polystyrene(EPS) was eatsblished based flexibility-viscoelastic correspondence principle,which includes the e...