A crack growth model for assessing the lifetime and short fatigue crack growth of ductile cast iron materials is proposed. The model bases on the assumption that the crack advance per cycle correlates with the cyclic crack tip opening displacement. Intergranular embrittlement at medium temperatures is accounted for as a temperature and strain rate dependent crack accelerating mechanism. The model is calibrated and successfully applied to predict temperature dependent fatigue lifetime and short crack growth of a ductile cast iron material.

中文翻译：

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一种评估受晶间脆化影响的 DCI 材料在 400 °C 附近的疲劳短裂纹扩展的方法

提出了一种用于评估球墨铸铁材料寿命和短疲劳裂纹扩展的裂纹扩展模型。该模型基于这样的假设，即每个循环的裂纹推进与循环裂纹尖端张开位移相关。中等温度下的晶间脆化被认为是一种依赖于温度和应变速率的裂纹加速机制。该模型经过校准并成功应用于预测球墨铸铁材料的温度相关疲劳寿命和短裂纹扩展。