Abstract Mechanical properties, especially rupture properties, of unfilled EPDM submitted to different radiation doses (with a dose rate of 1 kGy/h) are presented and discussed. The elastomer structure modifications, via chain scission and crosslinking, lead to a small increase in the strain at break, that can be described by the Kuhn approach, which relates it to the extensibility limit of the elastically active chains of the network. The critical strain energy release rate, G0, evaluated from tests on notched samples can be roughly described by the Lake and Thomas model, if the presence of soluble and dangling chains is taken into account in the calculation of the mean values used in the model equation. G0 is not correlated to the ultimate properties indicating the main influence of the crack initiation step on the material rupture.

中文翻译：

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γ 辐照 EPDM 的极限和韧性性能

摘要 介绍并讨论了未填充三元乙丙橡胶在不同辐射剂量（剂量率为 1 kGy/h）下的力学性能，尤其是断裂性能。通过断链和交联，弹性体结构的改变导致断裂应变的小幅增加，这可以通过库恩方法来描述，这与网络的弹性活性链的可扩展性极限有关。如果在计算模型方程中使用的平均值时考虑了可溶性链和悬垂链的存在，那么根据对缺口样品的测试评估的临界应变能释放率 G0 可以通过 Lake 和 Thomas 模型粗略描述. G0 与表明裂纹萌生步骤对材料断裂的主要影响的最终性能无关。