PSI - Issue 1

Paulo Chambel et al. / Procedia Structural Integrity 1 (2016) 134–141 Author name / StructuralIntegrity Procedia 00 (2016) 000 – 000

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4. Conclusions

A research work regarding fatigue crack propagation under opening-modes I, II or III, either for plane strain or plain stress state, in two types of austenitic stainless steels was developed and some remarks could be drawn:  JI values, either calculated numerically or derived from ASTM standards, are almost coincident for (a/w) ratios equal to 0.45 and 0.50;  For load opening Mode III, the crack propagated along a direction of approximately 70º and the crack growth rate was higher at the external surfaces of the specimens than at their middle region. Acknowledgements The authors would like to thank the Portuguese Foundation for Science and Technology through project ref. UID/EMS/00667/2013. References Anderson, T.L., 2005. Fracture Mechanics- Fundamentals and Applications, 3 rd ed., Taylor & Francis Group, U. S. A. ASTM E 1820 – 01, 2001. Standard Test Method for Measurement of Fracture Toughness, Annual Book of ASTM Standards, Vol. 03.01, ASTM International, U. S. A. ASTM E 647 – 00, 2000. Standard Test Method for Measurement of Fatigue Crack Growth Rates, Annual Book of ASTM Standards, Vol. 03.01, ASTM International, U. S. A. Brocks, W., Cornec, A., Scheider, I. 2002. Computational Aspects of Nonlinear Fracture Mechanics. Tech. Note GKSS/WMS/02/05 internal report. Budiansky, B., Rice, J.R. 1973. Conservation Laws and Energy-Release Rates. J. of Appl. Mechanics. 40, 201-203. Cherepanov, G.P. 1967. Crack propagation in continuous media. J. of Appl. Mathematics and Mechanics. 31, 476-488. Cruz, H.J., Martins, R.F., Viegas, J.C., Aveiro, J.L. 2010. Redesign of exhaust systems for naval gas turbines: usage of a new Cr Mn austenitic stainless steel. Mater. Science Forum, 636-637, 497-503. Eshelby, J.D. 1970. Energy relations and the energy-momentum tensor in continuum mechanics, in: M.F. Kanninen et al. (Eds.), Inelastic Behavior of Solids, McGraw-Hill, New York, pp. 77-115. Hellan, K. 1985. Introduction to fracture mechanics, 1 st ed., International Student Edition, Singapore. Hutchinson, J.W. 1983. Fundamentals of the phenomenological theory of nonlinear fracture mechanics. J. of Appl. Mechanics, 50, 1042-1051. Martins, R.F. et al. 2010. Final report of project ref. PTDC/EME/67071/2006 – Redesign of exhaust systems for naval gas turbines (in Portuguese) Rice, J.R. 1968. A path independent integral and the approximate analysis of strain concentration by notches and cracks. J . of Appl. Mechanics. 35, 379-386. Rigby, R.H., Aliabadi, M.H. 1998. Decomposition of the Mixed-Mode J-Integral - Revisited. International J. Solids Structures. 35, 2073-2099.