Problem
Research questions and friction points this paper is trying to address.
uncertainty quantification
fatigue life
powder bed fusion
additive manufacturing
microstructure
Uncertainty quantification of fatigue initiation life for powder bed fusion metal additive manufacturing
🤖 AI Summary
该研究通过结合微观结构和缺陷的不确定性，利用物理模拟方法预测激光粉末床熔融制造部件的疲劳寿命，并提出了一个分析分布模型。
📝 Abstract
Predicting fatigue life with quantified uncertainties is essential for the qualification of critical components produced by laser-based powder bed fusion additive manufacturing. We present a framework that propagates microstructure and defect uncertainties directly to a fatigue initiation life distribution for a specific part. In particular, microstructure and defect characterizations are obtained from electron backscatter diffraction and micro-computed tomography scan data, which in turn inform three physics-based simulations yielding the fatigue-affecting quantities: the elastic energy release rate, the surface energy along the crack path, and the fatigue indicator parameter. Accounting for the uncertainties in these quantities and the high correlations among them due to the shared underlying microstructure, we derive a closed-form probability density function for the fatigue initiation life. This provides an analytical distribution instead of conservative deterministic predictions and enables more informed decision making for the qualification and deployment of additively manufactured components. Applying the framework to 316L stainless steel parts produced by an EOS M290 laser powder bed fusion machine, we find that both grain sizes and void distributions influence the fatigue initiation life distribution. Specifically, for a fixed total void volume fraction, larger grain sizes cause a marginal reduction in fatigue initiation life, and a population of many small voids is more favorable for fatigue life than fewer, larger voids of equivalent total volume.
Innovation
Methods, ideas, or system contributions that make the work stand out.
uncertainty quantification
fatigue initiation life
physics-based simulations
probability density function
additive manufacturing
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