On prediction of metal structure destruction on the basis of complex acoustic-emission and magnetic study
Possibility to evaluate the stressed and strained state of metal and to predict destruction of metal structure, based on acoustic emission micromechanical model is studied. As it follows from this model, the logarithm for count of total acoustic emission pulses is linearly depends on the duration of load action, which provides us possibility to associate uniquely results of stressed and strained state of metal magnetic inspection on residual magnetic field strength with acoustic emission diagnostic parameters. It is shown on the smooth and shallow stage of destruction, when only elastic deformation of metal taking place, the count of total acoustic emission pulses is strictly depending on the total effective mechanical strain of metal. This allows us to compare evaluations of the stressed and strained state of metal with limits of mechanical properties of the metal and to predict reliably the moment when metal structure would be destructed. A good accordance of calculations with experimental results is shown.