A mesh-independent Gurson—Tvergaard—Needleman damage model and its application in simulating ductile fracture behaviour

Autor:	M.K. Samal, M. Seidenfuss, Eberhard Roos, B. K. Dutta, H. S. Kushwaha
Rok vydání:	2009
Předmět:	Mechanical equilibrium Materials science Discretization Tension (physics) law Mechanical Engineering Damage mechanics Void volume Fracture (geology) Fracture mechanics Composite material Diffusion (business) law.invention
Zdroj:	Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science. 223:283-292
ISSN:	2041-2983 0954-4062
Popis:	In this study, the classical Gurson—Tvergaard—Needleman (GTN) model has been extended to a non-local form using damage parameter ‘ d’ as a degree of freedom in the finite-element (FE) formulation. The evolution of the non-local damage is related to the actual void volume fraction ‘ f’ in ductile fracture using a diffusion type equation. The coupled mechanical equilibrium and damage diffusion equations have been discretized using the finite-element (FE) method. In order to demonstrate the mesh-independent nature of the new formulation, a standard fracture mechanics specimen (i.e. 1T compact tension) has been analysed using different mesh sizes near the crack tip and the results have been compared with those of the experiment. The effect of different GTN parameters on the fracture resistance behaviour of this specimen has been studied for the non-local model and these results have also been compared with those of the experiment.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0c18edcce11697162c6084606584e402 https://doi.org/10.1243/09544062jmes1121 Zobrazit plný text záznamu