The parts manufactured by metal sheets stamping can be made in homogeneous or heterogeneous materials (tailor welded blanks). Between these two kinds of materials there are differences in their structure and hence many differences in their behavior will result during forming operations. The differences in the structure and behavior of these materials require different conditions in the testing methods used to determine their mechanical characteristics. The present paper analyses the main particularities of the testing methods as a consequence of their different structures in the case of stress-strain curves determination.
