Journal ArticleDOI
Prediction of ductile fracture in axisymmetric tension by void coalescence
TLDR
In this article, fracture condition is identified by vanishing stress-carrying capacity of the material and an approximate fracture criterion is proposed for a wide range of conventional and superplastic materials as well as powder compacts.Abstract:
Fracture strains are predicted for ductile materials undergoing void growth and coalescence. The calculation scheme is based on Gurson–Tvergaard yield function and its associated flow rule. Fracture condition is identified by vanishing stress-carrying capacity of the material. The plastic flow parameters are all determined from experimental evidences for a variety of alloys. Comparison among predicted fracture strains and experimental ones is given for a wide range of conventional and superplastic materials as well as powder compacts. Finally an approximate fracture criterion is proposed.read more
Citations
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Journal ArticleDOI
Application of an extended void growth model with strain hardening and void shape evolution to ductile fracture under axisymmetric tension
TL;DR: In this article, the Gurson model adapted by Tvergaard is extended by fitting, based on numerical results proposed in the literature, the tuning parameters q1 and q2 in order to better capture the effects of the strain hardening and void shape evolution.
Journal ArticleDOI
The Mechanical Properties of Epoxy Composites Filled with Rubbery Copolymer Grafted SiO 2
TL;DR: In this paper, a method for toughening a highly crosslinked anhydride cured DGEBA epoxy using rubbery block copolymer grafted SiO2 nanoparticles was demonstrated.
Journal ArticleDOI
A model for ductile fracture based on internal necking of spheroidal voids
TL;DR: A ductile fracture criterion based on internal necking of the intervoid matrix ligament is proposed in this paper, which assumes the existence of an array of spheroidal voids subjected to extensional growth according to Gurson-Tvergaard flow function.
Journal ArticleDOI
A complete GTN model for prediction of ductile failure of pipe
TL;DR: In this article, an elastic-plastic finite element code has been developed together with Gurson-Tvergaard-needleman model for void nucleation and growth for pipe with circumferential crack under four point bending.
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An ellipsoidal void model for simulating ductile fracture behavior
TL;DR: In this article, an ellipsoidal void model based on a parallelogrammic void model was proposed to simulate ductile fracture behavior in three plastic deformation modes: plane strain tension, uniaxial tension, and simple shear.
References
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Journal ArticleDOI
Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
Journal ArticleDOI
On the ductile enlargement of voids in triaxial stress fields
James R. Rice,D.M. Tracey +1 more
TL;DR: In this article, a variational principle is established to characterize the flow field in an elastically rigid and incompressible plastic material containing an internal void or voids, and an approximate Rayleigh-Ritz procedure is developed and applied to the enlargement of an isolated spherical void in a nonhardening material.
Journal ArticleDOI
Analysis of the cup-cone fracture in a round tensile bar
Viggo Tvergaard,Alan Needleman +1 more
TL;DR: In this article, a set of elastic-plastic constitutive relations that account for the nucleation and growth of micro-voids is used to model the failure of a round tensile test specimen.
Journal ArticleDOI
Influence of voids on shear band instabilities under plane strain conditions
TL;DR: In this paper, the effect of microscopic voids on the failure mechanism of a ductile material is investigated by considering an elastic-plastic medium containing a boubly periodic array of circular cylindrical voids.