On the Creep Rupture of a Tube and a Sphere

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Abstract
Lower bounds on rupture times of a thick-walled tube in pure torsion and a hollow sphere under constant internal pressure are obtained. Numerical values of rupture times for the tube case with different forms of damage rate laws are presented. The type of damage law assumed makes a significant effect on predicting the time to rupture but failure in all cases occurs almost instantaneously after the appearance of first crack.

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