plastic strain ratio, plastic-strain ratio, strain ratio, R-value, r-value, r value, normal anisotropy factor, normal anisotropy coefficient
tõmbeteimil määratav lehtmetalli anisotroopiat iseloomustav tegur – laiuse ja paksuse suunaliste plastsete tegelike deformatsioonide suhe, a measure of plastic anisotropy defined by the ratio of the true plastic width strain to the true plastic thickness strain in a tensile test; the average plastic-strain ratio is determined from tensile samples taken in at least three directions from sheet rolling direction, usually 0, 45, and 90o
