Abstract
The patterns of strain which occur in the axisymmetric compression test when it is used for the estimation of the structural changes occurring during hot working are analysed. The analysis is conducted by numerical (finite element viscoplastic) methods. The physical properties are chosen to be close to those for a number of commercial alloys including those with aluminium, titanium, nickel, and iron bases. The strain patterns observed are such that only part of the specimen has strains close to the overall imposed strain. This part takes the form of an axisymmetric strain shell. The nature of this shell as a function of testing conditions is explored. An interpolative technique is developed so that the strain shell can be estimated for general conditions and a computer implementation is presented. Initial work suggests that the ideal specimen shape for metallographic examination is not the same as that for the best determination of flow stress.
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