Elastic Creep of Brittle Ceramics with Special Reference to Creep by Crack Growth in Aluminum Oxide

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

doi:10.1007/978-1-4684-3947-2_23

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1981

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(2 citation statements)

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“…Since the material will fracture at K = Kie, the critical stress intensity factor, elastic creep by crack growth is expected to occur primarily at stress levels immediately below the fracture stress. This latter conclusion agrees with the findings of Hasselman et al [32], who compiled modified creep deformation maps [33] for polycrystalline aluminas, which included creep by crack growth as a creep mechanism.…”

Section: Is [28]supporting

confidence: 87%

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

Venkateswaran

Hasselman

1981

J Mater Sci

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The suggestion is made that creep in solids can occur by time-dependent changes in elastic properties. Specific mechanisms include cavity formation and growth, crack nucleation and growth, grain boundary migration in polycrystalline solids with elastically anisotropic grains and the redistribution of the individual phases within a composite. Creep rates by these four mechanisms are analysed and discussed for simple mechanical models. Recommendations are made for the interpretation of creep data in order to clearly separate the contribution of elastic creep from the total creep deformation.

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Section: Is [28]supporting

confidence: 87%

“…At least for aluminum oxide, this was demonstrated by Hasselman etal. [32] who from crack growth data inferred the existence of creep by crack growth at temperature ranges over which diffusional creep mechanisms (i.e. NabarroHerring, Coble) were negligible.…”

Section: Discussionmentioning

confidence: 98%