Results 211 to 220 of about 13,246 (265)

A refined cohesive zone model that accounts for inertia of cohesive zone of a moving crack

Mechanics Research Communications, 2016
Abstract Existing cohesive zone models assume that actual fracture zone of non-zero mass can be modeled by a line segment (cohesive zone) with no mass and inertia. In the present work, a simplified mass-spring model is presented to study inertia effect of cohesive zone on a mode-I steady-state moving crack. It is showed that fracture energy predicted
J. Wu, C.Q. Ru
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Cohesive Zone Models and Fracture

The Journal of Adhesion, 2011
Basic concepts on cohesive models and their usage in fracture are reviewed. These included potential based cohesive zone models and the concept of an anisotropic failure surface. Some new results are presented for history-dependent cohesive zone models. In particular, a class of cohesive zone models where damage is represented by a state variable which
C. Y. Hui, A. Ruina, R. Long, A. Jagota
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Cohesive Zone Modelling

AIP Conference Proceedings, 2008
The paper studies the prediction of the crack growth of the brittle and ductile fracture of the structural materials. Crack extension is simulated by means of element extinction algorithms. The principal effort is concentrated on the application of the cohesive zone model with the exponential traction separation law and on the cohesive zone modelling ...
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Behavior of Alkali Accumulation of Coke in the Cohesive Zone

Energy & Fuels, 2018
The behavior of alkali accumulation of coke in the cohesive zone is confirmed, and the kalsilite crystals observed on the coke pore walls are presented in the hexagonal prism and sphere morphology. Closer to the lower edge of the cohesive zone, the amount of potassium adsorbed in coke decreases and the amount of sodium adsorbed increases.
Zhiyu Chang, Kexin Jiao, Xiaojun Ning, Jianliang Zhang   +3 more
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Improved cohesive stress integration schemes for cohesive zone elements

Engineering Fracture Mechanics, 2013
Abstract In this paper, several improved stress integration schemes based on Gaussian integration (GI) method and Newton–Cotes integration (NCI) method are presented and demonstrated to be able to improve the numerical performance of linear cohesive elements.
B.C. Do, W. Liu, Q.D. Yang, X.Y. Su
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Instability during cohesive zone growth

Engineering Fracture Mechanics, 2009
Tensile microcracking of quasi-brittle materials is studied by means of micromechanics, based on (i) an elasto-damaging cohesive zone model accounting for cohesive softening and (ii) a dilute distribution of non-interacting microcracks of uniform orientation and size.
Bernhard Pichler, Luc Dormieux
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Cohesive Zone Modeling for Adhesives

2009
Adhesives are very widely used in industry. In each application field, the adhesive that is used must fulfill specific requirements. Adhesive types can be classified for instance by their (thermo-) mechanical properties, their machining or their curing conditions. This paper describes, by way of example, the characterization criteria for structural and
Matthias Nossek, Stephan Marzi
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A micromechanical model for a viscoelastic cohesive zone

International Journal of Fracture, 2001
A micromechanical model for a viscoelastic cohesive zone is formulated herein. Care has been taken in the construction of a physically-based continuum mechanics model of the damaged region ahead of the crack tip. The homogenization of the cohesive forces encountered in this region results in a damage dependent traction-displacement law which is both ...
David H. Allen, Chad R. Searcy
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Thermodynamics and the cohesive zone in fracture

Zeitschrift für angewandte Mathematik und Physik ZAMP, 1979
This paper discusses the thermodynamics of the cohesive zone preceding a running crack. Appropriate forms of the first two laws are given and some simple constitutive equations are discussed.
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A cohesive zone model for thermomechanical fatigue

International Journal of Fatigue, 2020
Abstract In this study, a temperature dependent elastic-viscoplastic cohesive zone model is developed to predict the thermomechanical fatigue (TMF) behaviour of superalloys. The theory is based on rheological models enhanced with fatigue and creep damage variables which are micro-mechanically motivated.
Jeffy Abraham, Stephan Roth, Meinhard Kuna   +2 more
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