中文摘要：

在常温和不同应力下对硬质聚氨酯泡沫材料进行压缩蠕变试验,根据蠕变曲线,采用经典的Burgers模型描述了材料的蠕变行为,计算出蠕变参数,得到了蠕变本构模型,还对由Burgers模型导出的和试验测得的稳态阶段的蠕变速率进行了比较。结果表明：常温下,硬质聚氨酯泡沫材料的压缩蠕变行为具有明显的应力相关性,随着加载应力增大,蠕变变形量和稳态蠕变速率均增大;压缩蠕变过程分为明显的两个阶段,第一阶段的蠕变速率随时间延长而逐渐降低,第二阶段的蠕变速率基本保持恒定;由Burgers模型导出的稳态蠕变速率公式可以较好地预测硬质聚氨酯泡沫材料在压缩稳态蠕变阶段的蠕变速率。

英文摘要：

Compression creep test of hard polyurethane foam were carried out at room temperature and different stresses.According to the experimental creep curves,the classic Burgers model was used to describe the creep behavior of the material,and the creep constitutive model was obtained after the creep parameters were got,moreover,the creep rates during steady stage derived from Burgers model and the experiment measurement were compared.The results show that the compressive creep behavior of hard polyurethane foam at room temperature had obvious correlation with stress.With the increase of load stress,the creep strain and the steady creep rate were both increased.The compression creep process was divided into two distinct stages,in the first stage,creep rate decreased gradually with the increase of time,but during the second stage,the creep rate was maintained substantially constant.The steady state creep rate equation of the hard polyurethane foam derived from Burgers model can well predict the creep rate in compression creep steady stage.