Abstract
A model for the bulge forming of domes, which is based on the observation of stress-related hole growth, has been developed. The variation in dome thickness with time (and height) has been analytically expressed as a function of the strain rate sensitivity parameter m, the grain size d and the substructure-related constant in the constitutive equation for superplasticity. Both constant-pressure and constant-apex-strain-rate forming can be simulated using the model. The predictions of the analysis show good agreement with experiment, with an improvement being obtained over previous models.
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