This work is devoted to the experimental investigation of crack propagation in metals (titanium alloy Grade2 and stainless steel AISI304) under fatigue loading conditions using an original experimental setup consisting of acoustic emission sensors, heat flow sensor and the system of crack length registration. Irreversible processes taking place in materials during fatigue degradation are reflected on dissipative mechanisms including heat and acoustic emission. In this work we develop a technique for description of crack propagation stages and evaluation of material degradation mechanisms on the base of heat and acoustic emission data. As a result, the correlation between heat flow caused by plastic deformation near the crack tip and the energy of continuous acoustic emission signal during crack propagation was found.
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