Fracture mechanics interpretation of multiple-creep cracking using damage-mechanics concepts

Authors: Smith, D. J.; Webster, G. A.

Source: Materials Science and Technology, Volume 1, Number 5, May 1985 , pp. 366-372(7)

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Abstract:

Damage-mechanics concepts are incorporated into a fracture-mechanics interpretation of multiple grain-boundary cracking in uniaxial tensile creep specimens that undergo power–law creep deformation. Initially, methods of evaluating the fracture–mechanics creep parameter C^* for a structure containing a single macroscopic crack are extended to a uniform distribution of grain-boundary voids. Damage-mechanics models are then applied to describe damage accumulation. It is shown that, when the voids grow as disc-shaped cavities, the analysis yields predictions of growth rates which are consistent with characterizations of macroscopic crack growth behaviour involving the exhaustion of the available creep ductility in a process zone at the crack tip.

MST/195

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/026708385790124783

Publication date: 1985-05-01

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Materials Science and Technology is the successor of two previous titles, for which digitised archives are available: Metal Science (Vols. 1—17; 1967—84) and Metals Technology (Vols. 1—11; 1974—84).
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