Application of acoustic emission technique for the evaluation of micromechanical properties of steel

Abstract

Acoustic emission (AE) is the propagation of elastic waves by a material, caused by a dynamic local restructuring of its structure. According to modern physical concepts, AE, which occurs when indenting solids, is associated with the processes of nucleation, accelerated motion, and annihilation of crystal lattice defects (dislocations, twins, cracks, etc.). The relationship between mechanical properties and the appearance of AE signals has been extensively studied in ceramic materials, semiconductors, glasses, ionic crystals, and to a lesser extent in metals.