Void growth due to creep and grain boundary diffusion at high triaxialities

Giessen, van der Erik; Burg, M.W.D. van der; Needleman, A.; Tvergaard, Viggo

doi:10.1016/0022-5096(94)00059-e

Cited by 78 publications

(62 citation statements)

References 25 publications

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“…The effect of strain rate in the bulk material on the creep cavity growth was treated in finite-element calculations by Needleman and Rice [13]. The role of stress states around creep cavities, and the effect of the intercavity distance implemented in the model proposed by Needleman and Rice was investigated by van der Giessen [14]. In all of these studies, the vacancy transport is solely along the grain-boundary, by grain-boundary diffusion.…”

Section: Introductionmentioning

confidence: 99%

Finite element modelling of creep cavity filling by solute diffusion

Versteylen

Szymanski

Sluiter

et al. 2018

Philosophical Magazine

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Section: Introductionmentioning

confidence: 99%

Finite element modelling of creep cavity filling by solute diffusion

Versteylen

Szymanski

Sluiter

et al. 2018

Philosophical Magazine

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“…Sintering stresses are neglected in the analyses since they do not affect time to failure [6]. It is noted that the growth relations involve two modes of creep cavity growth, indicated by H and L in Box 1, as established in [5]. (Roughly speaking, the relations indicated by L are relevant at low stress triaxialities and small damage levels; the relations labeled H operate at high stress triaxialities and larger damage levels).…”

Section: Relations Concerning Cavitationmentioning

confidence: 99%

“…In view of the application of the cavity growth relations in a damage model to be discussed presently, it is important to realize that these relations are based on considerations of axisymmetric states of stress [5], [15][16][17]. Like in previous applications (e.g.…”

Section: Relations Concerning Cavitationmentioning

confidence: 99%

A continuum damage analysis of hydrogen attack in a 2.25Cr–1Mo pressure vessel

Burg

Giessen

Tvergaard

1998

Materials Science and Engineering: A

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A continuum damage analysis of hydrogen attack in a 2.25Cr-1Mo pressure vessel Burg, M.W.D. van der; Giessen, E. van der; Tvergaard, V. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractA micromechanically based continuum damage model is presented to analyze the stress, temperature and hydrogen pressure dependent material degradation process termed hydrogen attack, inside a pressure vessel. Hydrogen attack (HA) is the damage process of grain boundary facets due to a chemical reaction of carbides with hydrogen, thus forming cavities with high pressure methane gas. Driven by the methane gas pressure, the cavities grow, while remote tensile stresses can significantly enhance the cavitation rate. The damage model gives the strain-rate and damage rate as a function of the temperature, hydrogen pressure and applied stresses. The model is applied to study HA in a vessel wall, where nonuniform distributions of hydrogen pressure, temperature and stresses result in a nonuniform damage distribution over the vessel wall. Stresses inside the vessel wall first tend to accelerate and later decelerate the cavitation rate significantly. Numerical studies for different material parameters and different stress conditions demonstrate the HA process inside a vessel in time. Also, the lifetime of the pressure vessel is determined. The analyses underline that the general applicability of the Nelson curve is questionable. © 1998 Elsevier Science S.A.

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“…The coupled numerical simulations were summarized in a set of closed-form approximate relationships for the growth rate of the cavity volume,V , as a function of the current void radius a and spacing b. Referring to Reference [8] for details, the expression is of the forṁ…”

Section: Microscopic Modelmentioning

confidence: 99%

“…Firstly, detailed computations of the growth of a single void subject to an internal gas pressure and a remote stress state have been carried out in Reference [8], by simultaneous creep of the grains and di usion along the grain boundaries. The coupled numerical simulations were summarized in a set of closed-form approximate relationships for the growth rate of the cavity volume,V , as a function of the current void radius a and spacing b.…”

Section: Microscopic Modelmentioning

confidence: 99%

Micromechanics of high temperature hydrogen attack

Schlögl

Giessen

2001

Numerical Meth Engineering

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Micromechanics of high temperature hydrogen attack Schl"gl, S.M.; van der Giessen, E.; Schlögl, Sabine M.; Schlogl, SM Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. SUMMARYHydrogen attack is a material degradation process that occurs at elevated temperatures in hydrogen-rich environments, such as found in petrochemical installations. Weldments in components such as reactor vessels are particularly susceptible to hydrogen attack. This paper discusses a multi-scale micromechanics modelling approach in which the chemico-mechanical damage processes at sub-micron scale are coupled to the macroscopic behaviour through a series of size-scale transitions. A simulation of hydrogen attack in a welded reactor serves as an illustration of the approach.

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Void growth due to creep and grain boundary diffusion at high triaxialities

Cited by 78 publications

References 25 publications

Finite element modelling of creep cavity filling by solute diffusion

Finite element modelling of creep cavity filling by solute diffusion

A continuum damage analysis of hydrogen attack in a 2.25Cr–1Mo pressure vessel

Micromechanics of high temperature hydrogen attack

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