IDENTIFICATION OF THE MODE OF METAL WEAR UNDER THE ACTION OF EXOGENOUS LOADINGS

摘要

In devices assigned for energy conversion one can meet complex conditions of material wear that are difficult to value, which most frequently occurs due to simultaneous action of numerous agents. Considering the need to select construction materials that are best, the method for identifying predominant wear regime was proposed. Ex-post evaluation is to be done on basis of the process performance, having the modes of the material decay stand out by attribution specifics of the process performance separately to various erosive or corrosive effects. Fundamental modes include erosion under mechanical action and deterioration due to environmental chemical influences. The method based on the maximum energy dissipation principle for the processes in variational formulation enabled a functional representation of the processes to be found. The LaGrangian variational technique was employed, having initial and boundary conditions known. The proposition is a trial of the application of irreversible thermodynamic process tools for the quantification of such wastage processes as cavitation erosion and corrosion.