METHOD FOR DETERMINATION OF LEVEL OF HYDROGEN DEGRADATION OF MATERIALS AT TWO-AXIAL STRETCHING

摘要

Method for determination of level of hydrogen degradation of materials at two-axial stretching includes comparison of characteristics of crack stability of materials in hydrogen and air. One determines coefficient of degradation as ratio o f areas of plastic zones near top of crack in samples tested in air and in hydrogen. Dimensions of plastic zone are determined by field of springy-elastic displacements of deformed section of sample obtained by method of digital correlation of speckle-images of that zone.