Results 261 to 270 of about 67,515 (309)

On the dynamic evolution of ductile damage

International Journal of Fracture, 1996
In the present report some numerical results on the evolution equation of microvoids under quasi-static simplification (without consideration of inertial effect) are given in terms of the increasing rate of porosity versus external stress at different damage levels and in various damage stages at different material viscosities.
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Bifurcation Effects in Ductile Metals With Nonlocal Damage

Journal of Applied Mechanics, 1994
The purpose of this paper is to investigate some bifurcation phenomena in a porous ductile material described by the classical Gurson (1977) model, but with a modified, nonlocal evolution equation for the porosity. Two distinct problems are analyzed theoretically: appearance of a discontinuous velocity gradient in a finite, inhomogeneous body, and ...
Leblond, J. B., Perrin, G., Devaux, J.
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Ductile Damage Evolution and Strain Path Dependency

AIP Conference Proceedings, 2007
Forming limit diagrams are commonly used in sheet metal industry to define the safe forming regions. These diagrams are built to define the necking strains of sheet metals. However, with the rise in the popularity of advance high strength steels, ductile fracture through damage evolution has also emerged as an important parameter in the determination ...
Tasan, C.C., Hoefnagels, J.P.M., Peerlings, R.H.J., Geers, M.G.D., Horn, ten, C.H.L.J., Vegter, H.   +5 more
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On an Isotropic Damage MechanicsModel for Ductile Materials

International Journal of Damage Mechanics, 2001
A new model for combined elastoplasticity and damage is proposed. The model is based on the maximum dissipation principle and implements a strong coupling between plasticity and damage. First the evolution equations of different kinds of phenomenological damage models for ductile materials are discussed.
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Damage Model for Ductile Fracture

1986
Large plastic strain in metals is accompanied by nucleation and growth of microvoids and microcracks. This phenomenon is called “ductile plastic damage”; it leads to plastic (“ductile”) fracture. This kind of fracture is considered, for example, in the book of McClintock and Argon [1], from the viewpoint of physics.
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Damage evolution in ductile materials: from micro- to macro-damage

Computational Mechanics, 1995
This research presents a new simulation concept of damage evolution for metallic materials under large displacements and deformations. The complete damage range is subdivided into both the micro-damage and the macro-damage range. The micro-damage phase is described by the Cocks/Ashby void-growth model for isotropic, ductile materials under isothermal ...
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A new damage model for ductile materials

Engineering Fracture Mechanics, 1992
Abstract In this paper, based on the irreversible thermodynamics and orthogonal flow rule, a microdamage evolution equation is first formulated, taking advantage of the specific free energy and plastic potential with internal variables. Furthermore, by analogy with the microdamage evolution equation, a macrodamage evolution equation is derived ...
M. Zheng, Z.J. Luo, X. Zheng
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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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An Anisotropic Damage Model for Ductile Metals

Materials: Processing, Characterization and Modeling of Novel Nano-Engineered and Surface Engineered Materials, 2002
An anisotropic ductile damage description is motivated from fracture mechanisms and physical observations in Al-Si-Mg aluminum alloys with second phases. Ductile damage is induced by the classical process of nucleation of voids at inclusions, followed by their growth and coalescence.
Y. Hammi, M. F. Horstemeyer, D. J. Bammann   +2 more
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Numerical analysis of anisotropic ductile continuum damage

Computer Methods in Applied Mechanics and Engineering, 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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