Issue 33

Y. Hos et alii, Frattura ed Integrità Strutturale, 33 (2015) 42-55; DOI: 10.3221/IGF-ESIS.33.06 55 for cases which are relatively well known. The check results are very positive. Not only reasonable estimates of the crack driving force were obtained but also it could be confirmed that some numerical simulation procedures are unreliable. In the ongoing work, the huge bulk of information coming from both measurements and simulations will be analyzed intending to improve the understanding of non-proportional mixed mode fatigue crack growth. A CKNOWLEDGEMENT he German Research Foundation (Deutsche Forschungsgemeinschaft) is greatly acknowledged by the authors for financial support under grant Vo729/13-1. R EFERENCES [1] Zerres, P., Vormwald, M., Review of fatigue crack growth under non-proportional mixed-mode loading, International Journal of Fatigue 58, (2014) 75–83. [2] Chaboche, J.L., Dang Van, K., Cordier, G., Modelization of the strain memory effect on the cyclic hardening of 316 stainless steel, In: 5 th Int. Conf. Struct. Mech. in Reactor Techn., L (1979) L11/3. [3] Boller, Chr., Seeger, T., Materials data for cyclic loading, Elsevier, 1 (1987). [4] Zerres, P., Brüning, J, Vormwald, M, Risswachstumsverhalten der Aluminiumlegierung AlMg4.5Mn unter proportionaler und nichtproportionaler Schwingbelastung, Materials Testing, 53 (2011) 109-117. [5] Zerres, P., Brüning, J, Vormwald, M, Fatigue crack growth behavior of fine-grained steel S460N under proportional and non-proportional loading, Engineering Fracture Mechanics, 77 (2010) 1822-1834. [6] Lorenzino, P., Beretta, G., Navarro, A., Application of Digital Image Correlation (DIC) in resonance machines for measuring fatigue crack growth, Frattura ed Integrità Strutturale, 30 (2014) 369-374; DOI: 10.3221/IGF-ESIS.30.44. [7] http://www.correlatedsolutions.com/ accessed on 13 th February 2015. [8] Hos, Y. Vormwald, M. Freire, J.L.F., Using digital image correlation to determine mixed mode stress intensity factors in fatigue cracks, In: Proceedings of COTEQ 2015, Conference on Technology of Equipment, organized by ABENDI, Brazilian Society for NDT and Inspection, (2015). [9] McNeill, S.R., Peters, W.F., Ranson, W.F., Sutton, M.A., A Study of Fracture Parameters by Digital Image Processing, In: Proc. 18 th Midwestern Mechanics Conference, (1983) 267-271. [10] McNeill, S.R., Peters, W.F., Sutton, M.A., Estimation of stress intensity factor by digital image correlation, Engineering Fracture Mechanics, 28(1) (1987) 101-112. [11] Yoneyama, S., Murasawa, G., Digital Image Correlation, in Experimental Mechanics, [Ed. Jose Luiz de França Freire], in Encyclopedia of Life Support Systems (EOLSS) (2009), Developed under the Auspices of the UNESCO, Eolss Publishers, Oxford ,UK, [http://www.eolss.net ]. [12] Westergaard, H.M., Bearing Pressures and Cracks, J. Applied Mechanics, 6 (1939) A49-A53. [13] Vavrik, D., Jandejsek, I., Experimental evaluation of contour J-integral and energy dissipated in the fracture process zone, Engineering Fracture Mechanics, 129 (2014) 14-25. [14] Zhang, R., He, l., Measurements of mixed-mode stress intensity factors using digital image correlation method, Opticas and Lasers in Engineering, 50 (2012) 1001-1007. [15] Herz, E., Hertel, O., Vormwald, M., Numerical simulation of plasticity induced fatigue crack opening and closure for autofrettaged intersecting holes. Engineering Fracture Mechanics, 78 (3) (2011) 559-572. [16] Herz, E., Thumser, R., Bergmann, J.W., Vormwald, M. Endurance limit of autofrettaged Diesel-engine injection tubes with defects. Engineering Fracture Mechanics, 73 (2006) 3-21. [17] Döring, R., Hoffmeyer, J., Seeger, T., Vormwald, M., A Plasticity Model for Calculating Stress-Strain Sequences Under Multiaxial Nonproportional Cyclic Loading. Computational Material Science, 28 (2003) 587-596. T