Grain boundary sliding in polycrystalline materials

Sinha, Nirmal K.; Ehrhart, P.; Carstanjen, H. D.; Fattah, A.; Roberto, J. B.

doi:10.1080/01418617908234877

Cited by 88 publications

(42 citation statements)

References 22 publications

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“…The exponentia l term in Equ ation (3) has the same form as th at give n by Sinha (1979 ) for th e d elayed elas tic component of his rh eological equ a ti on. H e o btained a valu e of 0.34 [or th e ex ponent fo r th e time in th e expon enti a l term by fit ting his equ ation to d a ta from creep tes ts.…”

Section: Discussionmentioning

confidence: 99%

The elastic modulus of columnar-grain fresh-water ice

Gold

1994

A. Glaciology.

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ABSTRACT. An analysis is presented of stress and strain meas urements mad e during a n investiga ti on of th e ch aracteri sti cs of cracks form ed in column a r-g ra in , type S2, fr es h-water ice 5 during uni axial , compressive loading a t th e nominal strain ra tes of 10 3, 10 4 a nd 10 S i , and temperatures of _5°, -10°, -20° a nd -30°C. Th e a na lysis hows th a t for this range of strain rate and temperature, ice behaves as a n a nelas ti c so lid. R es ults are given for th e tim e, g rain -size and temperature d epend ence of th e elas ti c modulus in th e plan e perpendicula r to th e long direc tion of th e grains. They are shown to be in reaso na ble agreement with res ults of an earlier stud y of the a nelas ti c behaviour of the sam e type of ice. I t is suggested th a t th e grain -size a nd tempera ture dependence of th e elas tic modu li of ice for this ra nge of stra in rate a nd tempera ture may be du e, in part, to th e d epend ence of the relaxa tion time on these variab les.

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Section: Discussionmentioning

confidence: 99%

The elastic modulus of columnar-grain fresh-water ice

Gold

1994

A. Glaciology.

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“…(5) and relevant to the present tests were made (Fig. 9) using the value of the constants given in Sinha (1979): E= 9.5 GN.m-2, c, =9x a, (T=263K) =2.5x 10-4s-1, iUo(T=263K) = 1.8~ 10-'s-', Q= 67 kJ mol-' and R=8.32 J mol-I K-'.…”

Section: Discussionmentioning

confidence: 99%

Use of foil strain gauges in ice over a wide loading rate

Sinha¹

1989

Cold Regions Science and Technology

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“…It must be noted that the principle enunciated in this analysis of delayed elasticity is applicable only for the class of polycrystalline material that exhibits linear stress dependency (s = 1) in its delayed elastic (Sinha 1978a(Sinha . 1979a response.…”

Section: Generalized Viscoelastic Equationmentioning

confidence: 99%

“…A solid line for the delayedelastic strain was calculated using At = 03 s in eqn. (14b), whereas the broken line shows the results for At = 3 s. Calculations were made using the experimentally obtained average grain diameter (Sinha, 1981), d = 4.5 mm, T = 263 K, and previously determined creep parameters (Sinha, 1978a;1979a) given in Table 1.…”

Section: Comparison With Theorymentioning

confidence: 99%

“…The model was modified analytically to incorporate the effect of grain size, and a generalized constitutive equation was developed by comparing the creep response of ice with that of metals, alloys and other polycrystalline materials at high homologous temperatures (Sinha, 1979a). This allowed several other peculiarities of the creep behaviour of ice to be clarified (Sinha, 1979b).…”

Section: Introductionmentioning

confidence: 99%

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Creep model of ice for monotonically increasing stress

Sinha

1983

Cold Regions Science and Technology

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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.Cold Regions Science and Technology, 8, pp. 25-33, 1983 Creep model of ice for monotonically increasing stress Sinha, N. K. ABSTRACTA numerical integration method of predicting the strain path corresponding to a given stress history, and hence the stress-strain relation, has been developed for polycrystalline materials like ice at high homologous temperatures. The method is based on a generalized creep equation incoporating the grain size effect and predicts strain in terms of elastic, delayedelastic, and viscous or permanent strains. The theory has been tested successfilly during strength tests of ice in the temperature range of -5 to -30'~. The monotonous increase in strain rate observed during testing under conditions of constant cross-head displacement rate can now be explained analytically.

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Grain boundary sliding in polycrystalline materials

Abstract: /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

Cited by 88 publications

References 22 publications

The elastic modulus of columnar-grain fresh-water ice

The elastic modulus of columnar-grain fresh-water ice

Use of foil strain gauges in ice over a wide loading rate

Creep model of ice for monotonically increasing stress

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