Numerical investigation of constraint effects on ductile fracture in tensile specimens



Título del documento: Numerical investigation of constraint effects on ductile fracture in tensile specimens
Revista: Journal of the Brazilian Society of Mechanical Sciences and Engineering
Base de datos: PERIÓDICA
Número de sistema: 000312217
ISSN: 1678-5878
Autores: 1
Instituciones: 1Universidade de Sao Paulo, Sao Paulo. Brasil
Año:
Periodo: Abr-Jun
Volumen: 26
Número: 2
Paginación: 190-199
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Aplicado
Resumen en inglés This study explores the capabilities of a computational cell framework into a 3-D setting to model ductile fracture behavior in tensile specimens. The cell methodology provides a convenient approach for ductile crack extension suitable for large scale numerical analyses which includes a damage criterion and a microstructural length scale over which damage occurs. Laboratory testing of a high strength structural steel provides the experimental stress-strain data for round bar and circumferentially notched tensile specimens to calibrate the cell model parameters for the material. The present work applies the cell methodology using two damage criterion to describe ductile fracture in tensile specimens: (1) the Gurson-Tvergaard (GT) constitutive model for the softening of material and (2) the stress-modified, critical strain (SMCS) criterion for void coalescence. The present work first applies the cell methodology to investigate effects of constraint (stress triaxiality) on ductile crack initiation of notched tensile specimens. An application also follows to determine the dependence of ductility on stress triaxiality for the tested steel. These exploratory 3-D studies using computational cells clearly demonstrate its capability to predict the strong effects of constraint on measured stress-strain response for tensile specimens
Disciplinas: Física y astronomía,
Ciencias de la computación
Palabras clave: Mecánica, elasticidad y reología,
Fractura ductil,
Modelos 3D,
Tensión,
Constricciones,
Elementos finitos
Keyword: Physics and astronomy,
Computer science,
Mechanics, elasticity and rheology,
Ductile fracture,
3D modeling,
Tension,
Constraints,
Finite elements
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