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F.A. Díaz et alii, Frattura ed Integrità Strutturale, 25 (2013) 109-116; DOI: 10.3221/IGF-ESIS.25.16 116 closure at low R -ratios in the analysed samples. Moreover, results inferred from the analysis of thermoelastic images have been observed to be in good agreement with those obtained using the strain offset technique, showing the ability of TSA to successfully quantify the effective Δ K . R EFERENCES [1] James, M.N., Some unresolved issues with fatigue crack closure measurement, mechanisms and interpretation problems, Advance in Fracture Research, Proceedings of the ninth International Conference on Fracture. Edited by B.L. Karihaloo et al., Pergamon Press, 5 (1996) 2403-14. [2] Díaz, F.A., Yates, J.R., Patterson, E.A., Some improvements in the analysis of fatigue cracks using thermoelasticity, Int. J. Fatigue, 26, 4 (2004) 365-376. [3] Díaz, F.A., Patterson, E.A., Tomlinson R.A., Yates, J.R., Measuring stress intensity factors during fatigue crack growth using thermoelasticity, Fat. Fract. Eng. Mat. Struct., 27 (2004) 571-584. [4] Thomson, W. (Lord Kelvin), On the Thermoelastic, Thermomagnetic and Pyro-electric Properties of Matters, Philosophical Magazine, 5 (1878) 4-27. [5] Dulieu-Smith, S.M., Alternative calibration techniques for quantitative thermoelastic stress analysis, Strain, 31 (1995) 9-16. [6] Sanford, R., Dally, J.W., A general method for determining mixed-mode stress intensity factors from isochromatic fringe pattern, Engineering Fracture Mechanics, 11 (1979) 621-633. [7] Muskhelishvili, N.I., Some basic problems of the mathematical theory of elasticity, Third edition, Noordhoff Ltd., Groningen, Holland, (1953). [8] Stanley, P., Chan, W.K., Mode II crack studies using the "SPATE" technique’, Proc. of SEM spring conference on experimental mechanics, New Orleans, USA, (1986) 916-923. [9] Westergaard, H.M., Bearing pressures and cracks, J. of Applied Mechanics, 6 (1939) A49-63. [10] Murakami, Y., Stress Intensity Factors Handbook, Pergamon, Oxford, (1987). [11] ASTM, E647-95a, American Society of Testing and Materials, 03.01 (1999). [12] Skorupa, M., Beretta, S., Carboni, M., Machniewicz, T., An algorithm for evaluating crack closure from local compliance measurements, Fat. Fract. Eng. Mat. Struct., 25 (2002) 261-273.