✦ LIBER ✦

Ductile fracture and lifetime prediction of structural materials and components under high-temperature creep conditions

✍ Scribed by V.P. Golub; H.J. Christ; J. Byrne

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 196 KB
Volume: 44
Category: Article
ISSN: 0020-7403
DOI: 10.1016/s0020-7403(02)00004-8

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✦ Synopsis

The problem of long-term strength prediction of structural materials under uniaxial and biaxial creep conditions, which give rise to ductile fracture, is considered. A new approach to long-term fracture modelling based on constitutive equations of the "isochronous creep theory" and criteria of ductile fracture is suggested. The change in the momentary tangential modulus speciÿes the materials rheological behaviour and a value tending to zero is assumed as the ductile fracture criterion. Using the model the times to fracture of rods, beams and thin-walled tubes made of high-temperature and heat-resistant materials are estimated and they show good agreement with experimental data.

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