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Modification of a Defect-Based Fatigue Assessment Model for Al-Si-Cu Cast Alloys

机译:用于Al-Si-Cu铸造合金的缺陷基于缺陷的疲劳评估模型的修改

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摘要

Cast parts usually inherit internal defects such as micro shrinkage pores due to the manufacturing process. In order to assess the fatigue behaviour in both finite-life and long-life fatigue regions, this paper scientifically contributes towards a defect-based fatigue design model. Extensive fatigue and fracture mechanical tests were conducted whereby the crack initiating defect size population was fractographically evaluated. Complementary in situ X-ray computed tomography scans before and during fatigue testing enabled an experimental estimation of the lifetime until crack initiation, acting as a significant input for the fatigue model. A commonly applied fatigue assessment approach introduced by Tiryakioglu was modified by incorporating the long crack threshold value, which additionally enabled the assessment of the fatigue strength in the long-life fatigue regime. The presented design concept was validated utilising the fatigue test results, which revealed a sound agreement between the experiments and the model. Only a minor deviation of up to about five percent in case of long-life fatigue strength and up to about 9% in case of finite-lifetime were determined. Thus, the provided extension of Tiryakioglu’s approach supports a unified fatigue strength assessment of cast aluminium alloys in both the finite- and long-life regimes.
机译:由于制造过程,铸件通常继承内部缺陷,如微缩毛孔。为了评估有限寿命和长寿命疲劳区域的疲劳行为,本文科学促进了基于缺陷的疲劳设计模型。进行了广泛的疲劳和骨折机械测试,从而在口吃评估裂缝引发缺陷尺寸群体。在原位X射线计算机断层扫描扫描之前和疲劳测试之前和期间的互补扫描使得能够进行寿命的实验估计直至裂纹启动,充当疲劳模型的重要输入。通过结合长裂缝阈值来改变由Tiryakioglu引入的常用疲劳评估方法,其另外能够评估长寿命疲劳方案中的疲劳强度。呈现的设计概念利用疲劳测试结果进行了验证,揭示了实验与模型之间的声音协议。确定在有限寿命的情况下,在长寿命疲劳强度和高达约9%的情况下仅较小偏差高达约5%。因此,提供的Tiryakioglu的方法的延伸支持有限和长寿命的铸造铝合金的统一疲劳强度评估。

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