Abstract Mixed mode I/III fatigue fracture behaviour of bulk polymers is scarcely investigated. Thus, the aim of this work is to focus on the comparison of pure mode I and mixed mode I/III fatigue loading of polyethylene. During mixed mode I/III testing, both increases and decreases of lifetime were observed, depending on the levels of applied mode I and mode III loading. Additionally, the critical influence of friction and the accompanying increase of local temperature between the shear loaded crack flanks in mode III, as well as the dominant fracture mechanisms were discussed based on the fracture surface morphology.

中文翻译：

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聚乙烯在混合模式 I/III 条件下的疲劳表征

摘要 几乎没有研究本体聚合物的混合模式 I/III 疲劳断裂行为。因此，这项工作的目的是集中比较聚乙烯的纯模式 I 和混合模式 I/III 疲劳载荷。在混合模式 I/III 测试期间，观察到寿命的增加和减少，这取决于施加的模式 I 和模式 III 负载的水平。此外，基于断裂表面形态讨论了摩擦的关键影响和模式 III 中剪切载荷裂纹侧面之间局部温度的升高，以及主要的断裂机制。