Abstract Both elastic stress-strain testing and (primary and secondary) creep testing have been carried out on unreinforced rubber and on two particulate-reinforced rubber composites. This has been done at three different temperatures for all three materials. The stress-strain curve of the rubber conforms well to that expected from classical rubber elasticity theory. When expressed as true stress–strain relationships, all three materials exhibit approximately linear plots, with the increases in stiffness on adding the particulate conforming to composite elasticity theory. The creep behaviour of all three materials can be captured well using a Miller-Norton formulation and the observed dependence on temperature has been used to estimate the activation energy for creep to be ~7 kJ mole-1. This is thought to indicate that the creep process does not involve rupture of covalent bonds (for the range of applied loads used), but is associated with physical processes such as molecular untangling. The fillers do enhance the creep resistance, to a degree that is quantitatively consistent with the expected load transfer from matrix to particulate.

中文翻译：

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温度和填料含量对聚氨酯橡胶蠕变行为的影响

摘要 弹性应力-应变试验和（初级和次级）蠕变试验都已在未增强橡胶和两种颗粒增强橡胶复合材料上进行。对于所有三种材料，这是在三种不同温度下完成的。橡胶的应力-应变曲线与经典橡胶弹性理论的预期一致。当表示为真实的应力 - 应变关系时，所有三种材料都表现出近似线性图，添加符合复合弹性理论的颗粒后刚度增加。使用 Miller-Norton 公式可以很好地捕获所有三种材料的蠕变行为，并且观察到的温度依赖性已被用于估计蠕变的活化能为 ~7 kJ 摩尔-1。这被认为表明蠕变过程不涉及共价键的断裂（对于所用的施加载荷范围），但与物理过程（如分子解缠）有关。填料确实增强了抗蠕变性，其程度与预期的从基质到颗粒的载荷转移在数量上是一致的。