Consistent tangent stiffness for local-nonlocal damage modelling of metals

Journal article

In the present study we consider an adaptation of Nguyen's model [6] for brittle materials to the case of ductile rupture. We focus our attention on the formulation of a consistent tangent stiffness matrix which is essential for the efficiency and convergence of the implementation within a finite element framework. We demonstrate the capability of the model to generate mesh-independent results and to follow the rupture process very close to failure. Rupture analysis of thin plates of different geometry is presented (symmetric double notch-edged specimen, asymmetric double notch-edged specimen, double notch-edged specimen containing a hole). Further modifications are outlined required to simulate crack growth and paths under the conditions of creep and fatigue.

Authors: Belnoue, J; Nguyen, G; Korsunsky, A

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Elsevier
• Journal: Procedia Engineering
• Volume: 1
• Issue: 1
• Pages: 177-180
• Publication date: 2009-07-01
• DOI: 10.1016/j.proeng.2009.06.041
• ISSN: 1877-7058
• Language: English
• Keywords: nonlocal plastic strain; damage; ductile materials; fatigue; creep
• Subjects: Engineering & allied sciences; Civil engineering