Abstract The propagation life of short cracks has a great influence on the accurate fatigue life prediction. A new crack growth model is proposed to provide a unified modeling framework for integrating short and long crack propagation in the formulation of the crack driving force to account for multiple crack growth controlling parameters. Crack propagation rates and fatigue lives predicted by the model are compared with crack growth and fatigue life data sets of 2024-T3, 7075-T561 aluminum and Ti-6Al-4V titanium alloys. Predicted results are found to be in good agreement with crack growth data and fatigue life data for these materials.

中文翻译：

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基于2参数驱动力和裂纹扩展阈值的短长裂纹扩展模型

摘要 短裂纹的扩展寿命对疲劳寿命的准确预测有很大影响。提出了一种新的裂纹扩展模型，以提供统一的建模框架，用于在裂纹驱动力的公式中整合短裂纹和长裂纹扩展，以解释多个裂纹扩展控制参数。该模型预测的裂纹扩展速率和疲劳寿命与 2024-T3、7075-T561 铝和 Ti-6Al-4V 钛合金的裂纹扩展和疲劳寿命数据集进行了比较。发现预测结果与这些材料的裂纹扩展数据和疲劳寿命数据非常吻合。