A through-thickness damage regularisation scheme for shell elements subjected to severe bending and membrane deformations. (February 2019)

• Record Type: Journal Article
• Authors: Costas, Miguel; Morin, David; Hopperstad, Odd Sture; Børvik, Tore; Langseth, Magnus
• Is Part Of: Journal of the mechanics and physics of solids. Volume 123(2019)
• Page Start: 190
• Page End: 206
• Publication Date: 2019-02
• Subjects: Shell elements -- Through-thickness regularisation -- Ductile fracture -- Mesh dependency -- Local necking; Mechanics, Applied -- Periodicals; Solids -- Periodicals; Mechanics -- Periodicals; Mécanique appliquée -- Périodiques; Solides -- Périodiques; Mechanics, Applied; Solids; Periodicals; 531.05
• DOI: 10.1016/j.jmps.2018.08.002
• Languages: English
• ISSNs: 0022-5096

Abstract

Abstract: This research work proposes and validates a damage regularisation model for shell elements used in large-scale simulations. The model evaluates the ratio of bending to membrane loading in the elements based on the through-thickness gradient of the through-thickness plastic strain. The Cockcroft–Latham failure criterion is adopted, whose parameters are modified according to the length-to-thickness ratio of the shell elements in order to reduce the mesh dependency. This regularisation scheme is validated against experimental component tests on a double-chamber profile in an AA6005-T6 recrystallised aluminium alloy under quasi-static and impact loading conditions. The results show that the model is able to accurately predict fracture initiation under all tested conditions.