Abstract
Experimental results for twenty-eight tubular specimens of a M-63 brass, subjected to combined biaxial tension, are presented in the study of the effect of prestraining on the shape of the yield surface. Yield surfaces are found for various definitions of the yield locus. The strain increments are also shown in the stress plane in order to compare their orientation with the normality criterion. Moreover, the lengths of elastic and plastic strain increment vectors are compared at different moments of loading.
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