The effect of material ductility on notch fracture resistance: Numerical study. (April 2021)

• Record Type: Journal Article
• Authors: Park, Eui-Kyun; Youn, Gyo-Geun; Kim, Yun-Jae; Ainsworth, Robert A.
• Is Part Of: Theoretical and applied fracture mechanics. Volume 112(2021)
• Publication Date: 2021-04
• Subjects: Ductility -- Finite element damage analysis -- Multi-axial fracture strain model -- Notch fracture resistance; Fracture mechanics -- Periodicals; 620.1126
• DOI: 10.1016/j.tafmec.2020.102874
• Languages: English
• ISSNs: 0167-8442

Abstract

Highlights: Cold worked materials are used to represent materials with different ductility. The notch fracture resistance is determined using multi-axial fracture strain model. The slope of fracture resistance with notch radius increases with material ductility. The dependence on the ductility is also found for resistance after crack growth. Abstract: In this work, the effect of material ductility on the notch fracture resistance is quantified using FE damage analysis based on a multi-axial fracture strain model. Material properties of SUS316 stainless steel with three different levels of cold work (5%, 20% and 40%) are used to represent materials with different strength and ductility. Using validated FE damage analysis, notch fracture resistance data for these three materials with three different notch radii (0.2 mm, 0.4 mm and 0.8 mm) are generated numerically. Examination of notch fracture resistance data suggests that fracture initiation resistance (corresponding to 0.2 mm crack growth) depends almost linearly on notch radius. A linear dependence of the normalized fracture resistance of a notched specimen (with respect to that of a cracked one) on the material ductility is also found. The results are useful to estimate notch fracture resistance from the material ductility and the J-resistance curve obtained from a cracked specimen.