Classical and Thermodynamically Consistent Non-local Formulations for Ductile Damage: Comparison of Approaches

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2010

Autores

Jose M A C Cesar de Sa (Autor) FEUP; Filipe X C Andrade (Autor) Outra; Francisco M A Andrade Pires (Autor) FEUP

Ata de Conferência Internacional

Título: NUMIFORM 2010, VOLS 1 AND 2: DEDICATED TO PROFESSOR O. C. ZIENKIEWICZ (1921-2009)

Páginas: 125-132

10th International Conference on Numerical Methods in Industrial Forming Processes (NUMIFORM 2010)

Pohang, SOUTH KOREA, JUN 13-17, 2010

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia mecânica

Outras Informações

ID Authenticus: P-003-C61

DOI: 10.1063/1.3457527

Abstract (EN): Non-local theories have been commonly used as suitable localisation limiters for plasticity and damage in finite element analysis. Within the non-local framework, two competitive formulations have emerged: the first one is the classical approach, where a previous local model is directly enhanced with a non-local variable; the other one is fully supported on thermodynamical requirements. In this paper, we present two distinct classical non-formulations for elasto-plasticity coupled with damage where we chose damage and the energy release rate as non-local variables. Within the thermodynamically motivated framework, a simultaneous averaging of both damage and its conjugated thermodynamic force is implied from the Clausius-Duhem inequality. The three resulting models are assessed through numerical simulation with finite elements. The results show that the classical non-local model with averaging of the energy release rate may not regularise the solution under certain circumstances. On the other hand, the other two formulations are able to effectively eliminate the pathological mesh dependency.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8