Evaluation of Structural Metal Materials Damage by Acoustic Methods

The purpose of this research is to study the damage structural metal materials by acoustic method under various external fatigue and thermal influences. A model describing process accumulation scattered micro-damages in material proposed, parameters which can be measured method. It shown that irreversible processes occur structure during cyclic loading, leading changes physical mechanical characteristics. assessment a large number informative control was carried out. established elastic waves depend on characteristics medium study. state surface layer used tasks earlier developed resource material. takes into account influence degradation proposed. results experimental studies confirming proposed are presented. Methods for determining proposed: modulus, yield strength, fracture toughness, internal stresses, grain size, etc. elements, without violating their strength serve as basis constructing complex materials. Examples practical use obtained ensuring safe operation critical elements considered. data make it possible assess damaged properties loading quickly using waves.