Abstract Design of critical load carrying parts using additive manufacturing technology is still at early stages due to lack of sufficient understanding of their fatigue performance under service conditions. In this work, unnotched and notched fatigue behavior of LB-PBF made Ti-6Al-4V and 17-4 PH stainless steel specimens with different surface roughness were studied under variable amplitude axial and multiaxial loads. Both crack initiation approach using critical plane-based model and fracture mechanics approach using crack growth from the rough surface or surface defects at the notch were used to estimate the fatigue lives. Life estimations are then compared to the experimental results.

中文翻译：

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增材制造金属在包括多轴应力和缺口效应在内的可变幅度服务载荷条件下的疲劳性能：实验和建模

摘要 由于对服役条件下的疲劳性能缺乏足够的了解，使用增材制造技术设计关键承载部件仍处于早期阶段。在这项工作中，研究了 LB-PBF 制成的具有不同表面粗糙度的 Ti-6Al-4V 和 17-4 PH 不锈钢试样在变幅轴向和多轴载荷下的无缺口和缺口疲劳行为。使用基于临界平面的模型的裂纹萌生方法和使用粗糙表面裂纹扩展或缺口处的表面缺陷的断裂力学方法来估计疲劳寿命。然后将寿命估计与实验结果进行比较。