Elastic creep of stressed solids due to time-dependent changes in elastic properties

Venkateswaran, A.; Hasselman, D. P. H.

doi:10.1007/bf02396881

Cited by 24 publications

(3 citation statements)

References 29 publications

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“…However, at later stages, diffusion controlled crack growth and “elastic creep” deformation dominate. This type of deformation, which occurs in the absence of a viscous phase and is solely caused by nucleation and growth of microcracks, was first termed by Venkateswaran and Hasselman 41 as “elastic creep”.…”

Section: Resultsmentioning

confidence: 99%

Depletion of Grain‐Boundary Phase and Elastic Creep Deformation Upon Ultra‐Long Flexural Stress Rupture Experiments of NC‐132 Silicon Nitride

Kleebe

Braue

Quinn

2007

Journal of the American Ceramic Society

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A unique grain‐boundary structure evolution was observed in two MgO‐doped silicon nitride specimens (Norton, NC‐132) that were tested in ultra‐long flexure stress rupture experiments with an applied stress of 266 MPa and fractured at 14 941 and 17 376 h. Transmission electron microscopy showed that, although the starting material had a secondary glass phase both at multi‐grain junctions and along grain boundaries, the tested specimens contained no residual glass phase. Concurrent with the elimination of the secondary glass phase, a continuous network of cracked grain boundaries was observed after long‐term flexure testing consistent with the concept of elastic creep. It is, therefore, concluded that at ultra‐long annealing times, this material is affected by creep deformation via microcrack nucleation and growth due to the depletion of the amorphous siliceous grain‐boundary phase, which is seen as a truly transient, fugitive secondary phase.

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Section: Resultsmentioning

confidence: 99%

Depletion of Grain‐Boundary Phase and Elastic Creep Deformation Upon Ultra‐Long Flexural Stress Rupture Experiments of NC‐132 Silicon Nitride

Kleebe

Braue

Quinn

2007

Journal of the American Ceramic Society

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“…Venkateswaran and Hasselman [47] concluded, however, that the total strain of elastic creep by crack growth is of the order of a small multiple (2 to 3) of the initial elastic strain to which the material is subjected during initial loading. This point is supported by data compiled by Miller and Langdon [48], suggesting that for many metals the total cavity volume fraction rarely exceeds 1 %.…”

Section: Elastic Creepmentioning

confidence: 99%

Crack-enhanced creep in polycrystalline material: strain-rate sensitive strength and deformation of ice

Sinha

1988

J Mater Sci

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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. Science, 23, 12, pp. 4415-28, 1988 Crack-enhanced creep in polycrystalline material: strain-rate sensitive strength and deformation of ice Sinha, N. K. A non-linear viscoelastic creep equation for polycrystalline material is presented. It incorporates the effect of cracking and is capable of describing primary, secondary and tertiary behaviour. The model predicts the formation of microcracks and thus the damage state due to the high-temperature grain-boundary embrittlement process. This paper describes its application in formulating crack-enhanced creep and material response under constant strain-rate loading conditions (theoretically the simplest case but actually the most difficult to maintain). The formulation makes it possible to define the rate effect on stress-strain response and the rate sensitivity of strength, failure time, failure strain, damage and damage rate, strain recovery, etc. Numerical correspondence between theory and experiment was observed when predictions were compared with available closed-loop, controlled, constant strain-rate strength and deformation data on pure ice. Calculations made use of material constants determined from independent constant-load creep tests. Journal of Materials

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“…None of the conventional creep models adopted from metals satisfies these conditions. Even the older cavitation creep models, such as the models of Evans and Rana (1980) and Venkateswaran and Haselman (1981) do not fit with the experimental data. Only the recent model of Luecke and Wiederhorn (1999) corresponds to the requirements.…”

Section: Cavitation Creep Modelmentioning

confidence: 61%

Creep mechanism and microstructure evolution in silicon nitride ceramics

Lofaj

2007

IJMPT

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Tensile creep processes in a commercial grade of silicon nitride, SN 88, are reviewed with the focus on cavitation and microstructure changes. Experimental measurements showed that cavitation at multigrain junctions is the rate controlling creep mechanism. The cavitation creep model of Luecke and Wiederhorn was extended to explain non-power law behaviour and strong creep asymmetry. Secondary phase composition changes after prolonged creep tests resulted in the formation of Ybdisilicate phase at the expense of Yb-oxynitride due to oxidation. Such secondary phase changes affect residual glass composition, which has crucial effect on the processes involved in cavitation and resulting creep behaviour.

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Elastic creep of stressed solids due to time-dependent changes in elastic properties

Cited by 24 publications

References 29 publications

Depletion of Grain‐Boundary Phase and Elastic Creep Deformation Upon Ultra‐Long Flexural Stress Rupture Experiments of NC‐132 Silicon Nitride

Depletion of Grain‐Boundary Phase and Elastic Creep Deformation Upon Ultra‐Long Flexural Stress Rupture Experiments of NC‐132 Silicon Nitride

Crack-enhanced creep in polycrystalline material: strain-rate sensitive strength and deformation of ice

Creep mechanism and microstructure evolution in silicon nitride ceramics

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