泡沫塑料拉伸力学性能的研究

Investigation into Tensile Mechanical Properties of PUR Foam Plastics

对高密度泡沫塑料进行了拉伸实验，研究了材料的拉伸力学性能，并考虑了应变率效应和温度效应．实验结果表明：高密度硬质聚氨酯泡沫塑料在拉伸加载下应变率效应不太明显，但温度效应却十分明显．在拉伸加载下泡沫塑料具有明显的脆性变形特征，其应力应变曲线存在明显的非线性．此外，文中对泡沫塑料的模量和强度进行了理论预测，预测值与实验值基本一致．

The tensile mechanical properties of PUR foam plastics as well as its strain rate effect and temperature effect were investigated by means of tensile experiments. The experimental results show that the strain rate effect of PUR foam plastics is not obvious, but its temperature effect is quite obvious under tensile loading. At the same time, the PUR foam plastics has some brittle features and its stress strain curve is obviously nonlinear characteristics when it is deformed. In addition, the theoretical prediction of modulus and strength for PUR foam plastics were given, and the predicted results are basiclly in agreement with experimental ones.