Estimates of the creep rupture lifetime of structures using the finite element method

Multi-axial creep constitutive laws are presented and discussed for materials which obey different rupture criteria. The finite element method is formulated and used to investigate the creep rupture behaviour of uni-axially loaded tension-plates containing central circular holes. Experimental values of rupture lifetimes and plate displacements for copper and aluminium plates are shown to be closely predicted by the calculated ones. The calculated shapes of zones of material deterioration or rupture are shown to be in close agreement with the results of metallographic examinations of copper and aluminium plates.

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