SIMULTANEOUS ULTRASONIC EVALUATION WITH DIFFERENTIATION OF STRESS ANDTEXTURE

An ultrasonic method for either independent or simultaneous determinat ion of stress and texture is discussed. Quantitative differentiation b etween stress and texture during simultaneous measurements can be made . The method is useful for unidirectionally rolled, extruded, or cast material, and the validity of the method has been experimentally verif ied by extensive tests on rolled materials. Electromagnetic acoustic t ransducers (EMAT's) have been used, and these allow measurements durin g processing. In principle the method is applicable to non-conducting materials if piezoelectric or ferroelectric transducers are used, but since they are contracting and EMAT's are noncontacting, the constrain ts are more severe.