Assessment of subcritical crack growth in hydrogen-containing environment by the parameters of acoustic emission signals

Estimation models (differential equations, initial and final conditions) for determining the crack propagation kinetics in hydrogen-containing environments using the acoustic emission (AE) signal parameters are proposed. The formulation of these models is based on the main ideals of the AE method, dependence between the crack increment area and a sum of AE-signals amplitude, main criteria of fracture mechanics and laws of thermodynamics.     

Evaluation of the State of Subsurface Layers of the Metal Subjected to Shot Peening with the Help of Surface Acoustic Waves

Materials Science - We study the surface layers of the metal of low-carbon steel after shot peening. The velocity of surface Rayleigh waves is determined by the pulse-phase method at frequencies of...     

Theoretical Foundations of the Method of Acoustic Emission for the Diagnostics of Delayed Fracture of Materials

Materials Science - We present a survey of the results of theoretical investigations of the method of acoustic emission used for the determination of the limit equilibrium of materials with cracks,...     

Specific Features of the Fracture of Dental Polymeric Composites Under the Action of Local Loads

Materials Science - We compare the clinical-technological and physicomechanical properties of hybrid domestic and foreign composites obtained by light polymerization. The specific features of the...