高聚物等粘弹性材料力学行为的时间相关性,可采用材料内部时钟或特征时间表征.这个特征时间受多种因素的影响,如温度、物理老化、压力和溶剂浓度、损伤、应力水平或应变水平等.文中考察温度和应力水平对材料特征时间的影响,得到了材料粘度与温度和应力水平的相互关系,进而推导出材料中自由体积分数与温度及应力水平的相互关系式,为拓展时间-温度等效原理和建立时间-温度-应力等效原理提供了理论基础.
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