The fatigue crack growth behaviors of two fuel membranes are investigated at different temperatures. Fatigue crack growth rate increases with temperature, and Nafion XL membrane is more sensitive to temperature. An Arrhenius-type expression for fatigue crack growth rate is proposed and good prediction results are obtained. For Nafion XL composite membrane, fatigue crack grows by forming micropores ahead of crack tip. These micropore are formed due to the combined action of hygrothermal environment and mechanical stress, which increase with temperature. Besides, the interior micropores and microstructure changes in reinforcement layer also account for higher temperature sensitivity of Nafion XL membrane.

研究了两种燃料膜在不同温度下的疲劳裂纹扩展行为。疲劳裂纹扩展速率随温度升高而增加，Nafion XL 膜对温度更敏感。提出了疲劳裂纹扩展速率的Arrhenius型表达式，并获得了良好的预测结果。对于 Nafion XL 复合膜，疲劳裂纹通过在裂纹尖端前形成微孔而扩展。这些微孔是在湿热环境和机械应力的共同作用下形成的，随着温度的增加而增加。此外，增强层内部微孔和微观结构的变化也是Nafion XL膜具有更高温度敏感性的原因。