Evaluation of Localized Necking Models for Fracture Prediction in Punch-Loaded Steel Panels

• Main Authors: Burak Can Cerik, Kangsu Lee, Joonmo Choung
• Format: Article
• Language: English
• Published: MDPI AG 2021-01-01
• Series: Journal of Marine Science and Engineering
• Subjects: ductile fracture; punching; localized necking; collision; fracture strain; shell element
• Online Access: https://www.mdpi.com/2077-1312/9/2/117

This study compared the experimental test results on punch-loaded unstiffened and stiffened panels with numerical predictions using different localized necking modeling approaches with shell elements. The analytical models that were derived by Bressan–Williams–Hill (BWH) were used in their original form and extended version, which considers non-proportional loading paths while using the forming-severity concept and bending-induced suppression of through-thickness necking. The results suggest that the mesh size sensitivity depends on the punch geometry. Moreover, the inclusion of bending effects and the use of the forming-severity concept in the BWH criterion yielded improved estimations of fracture initiation with shell elements.