A rate theory of dislocation mobility

Krausz, A. S.

doi:10.1016/0001-6160(68)90056-4

Cited by 33 publications

(20 citation statements)

References 18 publications

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“…141 in Kocks et al, 1975). Additionally, Hansen et al (2019) used a hyperbolic sine instead of an exponential, which was originally proposed by Garofalo (1963) and later given physical justification by considering the potential for forward and backward fluctuations of the dislocation (Krausz, 1968;Wilson & Wilson, 1966;Wu & Krausz, 1994). These considerations yield a flow law for the plastic strain rate from gliding dislocations,  p , of the form…”

Section: Magnitude Of Anelastic Reverse Strainmentioning

confidence: 99%

Dislocation Creep of Olivine: Backstress Evolution Controls Transient Creep at High Temperatures

et al. 2021

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The evolution of viscosity during flow of mantle rocks at high temperatures is fundamental to a variety of geodynamic processes. For example, transient creep of the upper mantle has been identified as a major contributor to geodetically observed surface deformations during post-seismic creep (Freed et al., 2012;Masuti et al., 2016;Pollitz, 2005;Qiu et al., 2018), for which the strains are typically <10 −3 , and inferred viscosities are one to two orders of magnitude lower than the long-term, steady-state viscosity. Because transient viscosities also continue to evolve during postseismic deformation, they likely cause a time-dependent transfer of stresses to neighboring faults, rather than the instantaneous transfer assumed by popular calculations of Coulomb stress changes (e.g., Freed, 2005). Although sophisticated earthquake forecast models do incorporate time-dependent loading according to average plate motion rates (e.g., Field et al., 2015Field et al., , 2017, they still do not incorporate variable loading rates that would occur due to transient creep of the lithosphere. In addition, transient viscosities are expected to be important, although they have not yet been thoroughly considered, in other small-strain processes including flexure of the lithosphere near volcanic loads (Zhong & Watts, 2013) or in subducting slabs near trenches (Hunter & Watts, 2016), during which the strains rarely exceed 10 −2 .

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Section: Magnitude Of Anelastic Reverse Strainmentioning

confidence: 99%

Dislocation Creep of Olivine: Backstress Evolution Controls Transient Creep at High Temperatures

et al. 2021

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“…Equations based on the dislocation mobility concept involving the transition state theory (28,29) may be applicable to the process. This approach results in exponential type expressions.…”

Section: --2__mentioning

confidence: 99%

Mechanism of creep of hydrated portland cement paste

Feldman

1972

Cement and Concrete Research

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/0008-8846(72)90107-X Cement and Concrete Research, 2, 5, pp. 521-540, 1972-09-01 Mechanism of creep of hydrated portland cement paste Feldman, R. F.CEMENT and CONCRETE RESEARCH. Vol . 2, pp. 521-540, 1972. Pergamon Press, Inc. Printed in the United States. CREEP, STABILITY, HELIUM FLOW, CEMENT PASTE

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“…Using a theoretically rigorous argument it was shown before that for a very wide range of crystalline and polymeric materials the plastic strain rate is described well by the following relation [4,5,6] = A~r exp ~,-k-T/ -Ab exp -kT / Because the force is the same along the specimen the cross section reduction rate is independent of the cross section.…”

mentioning

confidence: 99%

A note on the fracture conditions of superplastic alloys

Krausz

1974

Int J Fract

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Superplastic behavior is the consequence of two factors: Newtonian flow and the equilibrium rate of bond breaking and meading. Both processes can be expressed with the rate theory. The analysis based on the theory shows that Newtonian flow occurs if the activation volume associated with plastic flow is small and the deformation is controlled by a quasisymmetrical barrier. The equilibrium condition of bond breaking rate is the function of the bond energy, temperature and stress. These two processes are interrelated and fracture is delayed only when both conditions are satisfied.

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A rate theory of dislocation mobility

Cited by 33 publications

References 18 publications

Dislocation Creep of Olivine: Backstress Evolution Controls Transient Creep at High Temperatures

Dislocation Creep of Olivine: Backstress Evolution Controls Transient Creep at High Temperatures

Mechanism of creep of hydrated portland cement paste

A note on the fracture conditions of superplastic alloys

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