Modelling of critical defect distributions for estimating the size effect of selective laser melted 316L stainless steel. (February 2023)

• Record Type: Journal Article
• Authors: Tomaszewski, Tomasz
• Is Part Of: International journal of fatigue. Volume 167:Part A(2023)
• Publication Date: 2023-02
• Subjects: Additive manufacturing -- High-cycle fatigue -- Size effect -- Crossland criterion -- Highly stressed volume -- Weibull distribution; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2022.107378
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Random defects determining the fatigue strength decrease in SLM 316L stainless steel. Significant effect of crack initiation phase on material size sensitivity. Simulating extreme value distributions of Crossland equivalent stress for size effect coefficient estimation. Good predictive capability of the proposed approach in the probabilistic modelling defect size distribution. Abstract: The paper presents modelling the effect of specimen size on the fatigue behaviour of SLM 316L stainless steel. The failure mechanism assumes an important role in fatigue crack initiated from random material defects. The finite element calculations showed an increase in the non-local stress distribution of the Crossland criterion for varying defect location and size. A procedure for generating critical defects in a highly stressed volume is proposed to simulate the distributions of extreme values of equivalent stress and material sensitivity coefficient for size effect. The predicted fatigue strength for selected defect size distribution parameters correlates well with experimental data.