Results 251 to 260 of about 8,447 (307)

Damage work as ductile fracture criterion

International Journal of Fracture, 1994
This paper treats the ductile failure initiation in circumferentially-notched tension specimens and explores the local damage model that is able to represent the continuous degradation of the deforming material. With the aid of finite element calculations, the notched specimens have been simulated numerically and the whole strain-stress history for ...
R. Chaouadi, P. Meester, W. Vandermeulen
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A Coupled Computational Framework for Ductile Damage and Fracture

2008
Metal forming processes generally introduce a certain amount of damage in the material being formed. Predictions of the damage formation and growth in a series of forming steps may assist in optimising the individual operations and their order. This is particularly true for operations such as cutting and blanking, which rely on the nucleation of damage
Peerlings, R.H.J., Mediavilla, J., Geers, M.G.D.   +2 more
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A continuum damage mechanics model for ductile fracture

International Journal of Pressure Vessels and Piping, 2000
Abstract Continuum damage mechanics theory together with large deformation elastic–plastic finite element analysis has been used to predict crack growth initiation in ductile materials. The damage growth law is based on experimental observations reported in the literature. A local crack growth initiation criterion is proposed. The criterion makes use
S. Dhar, P.M. Dixit, R. Sethuraman
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MICROMECHANICAL MODELLING OF DAMAGE AND FRACTURE OF DUCTILE MATERIALS

Fatigue & Fracture of Engineering Materials & Structures, 1998
A micromechanical model of ductile damage by void nucleation, growth and coalescence is widely and successfully applied to describe phenomena of ductile tearing. The model’s fundamental principles, and especially the constitutive equations of Gurson, Tvegaard and Needleman (GTN‐model), are briefly described.
null Steglich, null Brocks
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A new microvoid-damage model for ductile fracture

Engineering Fracture Mechanics, 1986
Abstract In this paper, a new model of isotropic ductile plastic void-damage based on a continuum void-damage variable, D v , on the effective stress concept and on thermodynamics is derived, and is used to analyze the growth and coalescence of microvoids.
null Wei Hua Tai, null Bing Xian Yang
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Relationship of strain hardening and damage in ductile fracture

Metal Science, 1980
Abstract The majority of theories of ductile fracture consider the values of the imposed strains needed to initiate and grow voids. However, in describing the microstructural damage resulting from the production and growth of voids, it is important to consider the spatial distribution of the damage in relation to the microstructure.
R. Iricibar, G. IeRoy, J. D. Embury
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A new damage mechanics criterion for ductile fracture

Engineering Fracture Mechanics, 1987
Abstract In this paper, a new damage mechanics parameter V D is proposed, which is valid for characterizing ductile fracture, and a damage mechanics criterion is established based on a continuum damage mechanics model. The new material parameter of ductile fracture V Dc with an obvious microscopic physical meaning, which can be ...
null Wei Hua Tai, null Bing Xian Yang
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Crack Extension Modelling of a Ductile Fracture Damage

Emerging Technologies in Fluids, Structures and Fluid Structure Interactions: Volume 2, Shock, Wave Propagation, Tube Bundle Dynamics, and Structural Dynamics, 2002
In order to analyse the ductile tearing in the Nickel-Chrome steel case, Gurson-Tvergaard-Needelman (GTN) model has been used in this study. Both experimental and numerical results have been obtained for notched round and CT specimens. Indeed, the crack growth resistance, defined by J-Δa curve, has been correctly simulated using the numerical ...
M. Naït Abdelaziz, A. Imad
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Ductile fracture characterization with an anisotropic continuum damage theory

Engineering Fracture Mechanics, 1988
Abstract The paper presents an investigation of characterizing ductile fracture of centre-cracked tension specimen made of thin aluminium alloy based on the theory of an anisotropic continuum damage. The characterization is achieved by predicting the crack initiation of the ductile specimen using the finite element analysis.
C.L. Chow, J. Wang
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Plastic damage and ductile fracture in mild steels

Engineering Fracture Mechanics, 1990
Abstract In this paper, plastic damage and ductile fracture processes in mild steels are investigated based on the phenomenological theory of continuum damage mechanics and on micromechanical experimental observations. Some theoretical models are further discussed and new experimental results are reported, which contain plastic damage evolution ...
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