13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- 6 Summary. Relations are obtained which describe change in temperature at the sample surface and the tip of fatigue crack during a uniaxial cyclic deformation taking into account the linear and nonlinear thermoelastic effects. Shown that the process of heat generation is essentially nonlinear. Using of infrared thermography methodic can effectively investigate the processes associated with both the localization of plastic deformation in the crack tip and the friction on its banks. At this stage, studies have shown experimentally that the zone of plastic deformation does not coincide with the predictions of the linear fracture mechanics, and the maximum heat is reached on the descending branch of the loading. Fracture surface has 2 zones with significant difference of Hurst exponent which correspond damage accumulation and crack propagation. Acknowledgements The study was supported by The Ministry of education and science of Russia, project N8753 and grant RFBR 12-01-31145 mol_a, References [1] M.P. Luong, Infrared thermographics scanning of fatigue in metals, Nuclear Engineering and Design. №158 (1995). [2] O. Plekhov, N. Saintier, T. Palin-Luc, S. Uvarov, O. Naimark, Theoretical analysis, infrared and structural investigation of energy dissipation in metals under quasi-static and cyclic loading , Material Science and Engineering V. 462. N.1 (2007) [3] O. Plekhov, T. Palin-Luc, O. Naimark, S. Uvarov, N. Saintier, Fatigue crack initiation and growth in a 35CrMo4 steel investigated by infrared thermography, Fatigue and fracture of engineering materials and structures V. 28, I. 1, (2005) [4] W. Oliferuk, M. Maj, B. Raniecki, Experimental analysis of energy storage rate components during tensile deformation of polycrystals, Materials Science and Engineering v. 374 (2004) [5] P. Rosakis, A.J. Rosakis, G. Ravichandran, J. Hodowany, A thermodynamic internal variable model for the partition of plastic work into heat and stored energy in metals, J. Mech. and Phys. Solids, №48 (2000) [6] R. Jones, M. Krishnapillai, K. Cairns, N. Matthews, Application of infrared thermography to study crack growth and fatigue life extension procedures, Fatigue & Fracture of Engineering Materials & Structure, v.33 (2010)
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