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Extension of the gurson model accounting for the void size effect

Acta Mechanica Sinica 2005年第2期21卷 142-150页

作者： JieWen Keh-ChihHwang YonggangHuang KeyLaboratoryofFailureMechanics DepartmentofEngineeringMechanicsTsinghuaUniversityBeijing100084China DepartmentofMechanicalandIndustrialEngineering UniversityofIllinoisUrbanaIL61801USA

A continuum model of solids with cylindrical microvoids is proposed based on the Taylor dislocation model. The model is an extension of gurson model in the sense that the void size effect is accounted for. Beside the void volume fraction f, the intrinsic material length l becomes a parameter representing voids since the void size comes into play in the gurson model. Approximate yield functions in analytic forms are suggested for both solids with cylindrical microvoids and with spherical microvoids. The application to uniaxial tension curves shows a precise agreement between the approximate analytic yield function and the exact parametric form of integrals.

关键词： Void size effect gurson model Taylor dislocation model Yield condition

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THE VOID-SIZE EFFECT ON PLASTIC FLOW LOCALIZATION IN THE gurson model

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Acta Mechanica Sinica 2004年第4期20卷 393-399页

作者：文洁黄永刚黄克智 Failure Mechanics Laboratory Department of Engineering MechanicsTsinghua UniversityBeijing 100084China Department of Mechanical and Industrial Engineering University of IllinoisUrbanaIL61801USA

Recent studies have shown that the size of microvoids has a significant effect on the void growth *** purpose of this paper is to explore whether the void size effect can influence the plastic flow localization in ductile *** have used the extended gurson's dilatational plasticity theory,which accounts for the void size effect,to study the plastic flow localization in porous solids with long cylindrical *** localization model of Rice is adopted,in which the material inside the band may display a different response from that outside the band at the incipient plastic flow *** present study shows that it has little effect on the shear band angle.

关键词： plastic flow localization gurson model size effect strain gradient

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A Suggestion to Make gurson Damage model Mesh Independent for Cracked Specimens

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Journal of Mechanics Engineering and Automation 2011年第1期1卷 61-67页

作者： Bijon Kumar Dutta Reactor Safety Division Hall-7 Bhabha Atomic Research Centre Mumbai 400 085 India

Continuum damage mechanics is applied to compute fracture J-initiation and J-Resistance （J-R） curve for 20MnMoNi55 material by analyzing TPB and CT specimens. A strong mesh dependency of gurson model is observed. The exponential form of q2 parameter shown earlier near crack tip is further modified to have a variable asymptotic value q2a away from crack tip. The asymptotic value q2a is suggested to be a function of crack-tip mesh size to overcome mesh dependency of J-R and load-displacement curves. The relation between q2a with the normalized crack-tip mesh size is determined numerically for CT and TPB specimens.

关键词： Ductile fracture gurson model q2 Parameter J-R Curve mesh independent.

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