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On some approach to the creep long - term ductile fracture analysis under plane stress

Golub V. P.

Zeszyty Naukowe Politechniki Białostockiej. Mechanika

2001

Z. 24

179--186

A new approach to long-term fracture modeling based on the "isochronous creep theory" is suggested. The change in the momentary tangential modulus specifies the materials rheological behaviour and a value tending to zero is assumed as the ductile fracture criterion. The generalization for the plane state of stresses is made on the basis of a mixed two-parameter fracture criterion taking into account signs of principal stresses. Using the model suggested the time to fracture of thin-walled tubes made of high-temperature and heat-resistant materials are estimated and shows good agreement with adopted experimental data.