Physics-Based Prognostics for LCF Crack Nucleation Life of IMI 685 Aero-engine Compressor Disc
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Abstract
A life cycle management-expert system (LCM-ES) framework is employed in this work for physics-based prognostics of a compressor disc. The modeling approach involves the integration of both global behavior and localized response of component at the microstructural level. This paper presents the results of a low cycle fatigue (LCF) case study for a near alpha titanium alloy (IMI 685) high pressure compressor disc using a microstructure based damage model and finite element analysis results. Both deterministic and probabilistic crack nucleation lives are determined at the two critical locations. The lognormal distributions of α-grain structure of IMI685 and hard alpha (HA) inclusions is considered in the probabilistic analysis, while the deterministic life is predicted based on their extreme values that would represent the worst life. In the LCF modeling, the plastic strain estimation assumes an empirical coefficient that has a strong dependence on the alpha grains and defect size. The proposed life prediction model is capable of capturing the effect of the grain size and hard alpha particle density variation on the LCF crack nucleation life. The worst case deterministic life corresponds well with 0.1% probability of failure and lie around 3542 and 4710 cycles respectively for the primary fracture critical location in the disc.
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Lütjering, G. & Williams, J., C. (2007). Titanium- Engineering Materials and Processes, Second ed. Springer.
Lütjering, G., Williams, J. C. and Gysler, A. (2003).Microstructure and mechanical properties of titanium alloys, Titanium, Springer.
Leyens, C. & Peters, M. (ed.), (2003). Titanium and Titanium Alloys - Fundamentals and Applications,
Wiley-VCH Verlag GmbH & Co. KGaA.
Metzger, M. & Seifert, T., (2012). A Mechanism-Based Model for LCF/HCF and TMF/HCF Life Prediction: Multiaxial Formulation, Finite-Element Implementation and Application to Cast Iron”, TECHNISCHE MECHANIK, 32, 2-5.
Southwest Research Institute (2008). University of Texas at San Antonio, Mustard Seed Software, GE Aviation, Honeywell, Pratt & Whitney, Rolls-Royce Corporation (2008), Turbine Rotor Material Design, Phase 2 Final Report, FAA Grant 99-G-016, Federal Aviation Administration, Washington, DC.
Semiatin, S.L., Nicolaou, P.D.,Thomas, J.P. and Turner, T.J., (2008). Defect occurrence and modeling for the thermo- mechanical processing of aerospace alloys, AFRL-RX- WP-TP-2008-4336, Air Force Research Lab., Materials and Manufacturing Directorate, Wright Patterson Air Force base, OH, 45433-7750, Air Force Material Command.
Boyer, R., Welsch, G. & Collings, E.W. (1994). Materials properties handbook: Titanium alloys, eds. ASM International, Material Park, OH.
Wanhill, R., & Barter, S. (2012). Fatigue of beta processed and beta heat treated titanium alloys, Springer science and Business Media.
Winston H. C., Robert, A. S., Joseph A. S. (1986). A Method for the dispersion of hard alpha defects in ingots of titanium or titanium alloy and ingots produced thereby, US patent publication number, US4622079 A, GE Publication.
McKeighan, P. C., Perocchi, L. C., Nicholls, A. E., McClung R. C. (1999). Characterizing the Cracking Behavior of Hard Alpha Defects in Rotor Grade Ti-6-4Alloy,
http://www.darwin.swri.org/html_files/pdf_docs/pubs/1 999 /tms98.pdf
Nag, A. K., Praveen . V. U. K. and Singh, V. (2006). Low cycle fatigue behaviour of Ti – 6Al – 5Zr – 0⋅5 Mo – 0⋅25Si alloy at room temperature, Bull. of Mater. Sci., Vol. 29, No. 3, pp. 271 – 275. Indian Academy of Sciences.
Ramachandra, C., Verma, V. K. and V. Singh, V. (1988). Low cycle fatigue behaviour of titanium alloy 685, International Journal of Fatigue, Vol. 10, Issue 1, 21–26.
Koul, A. (1998). Some aspects of mechanistic modeling of creep, fatigue and fracture, Proceedings of Advanced Material Technologies, Banaras, India.
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