PSI - Issue 13

R.R. Yarullin et al. / Procedia Structural Integrity 13 (2018) 902–907 Author name / Structural Integrity Procedia 00 (2018) 000 – 000

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The distributions of the elastic SIF K 1 , K 2 and plastic SIF K p along the initial crack tip in compressor disk at the considered temperatures are plotted in Fig. 6. Fig. 6a, 6b shows that the distributions of the elastic SIF K 1 and K 2 are the same for both temperatures, as the elastic properties of the material are approximately the same (Table 1). However, the plastic SIF K p (Fig. 6c) exhibits a very useful sensitivity to the changing of plastic properties of the tested material by temperature.

a) c) Fig. 6. Elastic SIF K 1 (a), elastic SIF K 2 (b) and plastic SIF Kp (c) distributions for the initial crack tip. b)

5. Conclusions In this study numerical analysis of cracked aircraft GTE compressor disc was conducted at operation loading conditions. The crack tip shape, varied from quarter-circular to quarter-elliptical, was considered. The elastic constraint parameter in the form of the non-singular T Z – factor, as well as the elastic-plastic constraint parameters in the form of the local stress triaxiality h and I n -factor were analyzed for the specified combinations of crack sizes and temperature conditions. The distribution of plastic SIF K p was determined along various cracks front. It is further demonstrated that, the plastic SIF K p exhibits a very useful sensitivity to the changing of plastic properties of the tested material by temperature. It is stated that the plastic SIF K p is attractive as the self-dependent unified parameter for characterization the fracture resistance for aircraft GTE components. Shanyavsky A.A., Stepanov N.V., 1995. Fractographic analysis of fatigue crack growth in engine compressor disks of Ti-6Al-3Mo-2Cr titanium alloy. Fatigue Fract. Engng. Mater. Struct., Vol. 18, 5, 539 – 550. Shlyannikov V.N., Iltchenko B.V., Stepanov N.V., 2001. Fracture analysis of turbine disks and computational – experimental background of the operational decisions. Eng. Failure Analysis, 8, 461 – 75. Shaniavski A.A., 2003. Tolerance fatigue failures of aircraft components. Synergetics in engineering applications. In: Monography, Ufa, pp. 803 ANSYS mechanical APDL theory reference release 14.5. 2012. ANSYS, Inc., Southpointe, 275 Technology Drive, CanonBurg, PA. Shlyannikov V.N., Zakharov A.P., Yarullin R.R., 2016. Structural integrity assessment of turbine disk on a plastic stress intensity factor basis. International Journal of Fatigue, 92, 234-245. (a) Slyannikov V.N., Yarullin R.R., Ishtyryakov I.S., 2015. Surface crack growth in cylindrical hollow specimen subject to tension and torsion. Frattura ed Integrita Structurale, 33, 335-344. Shlyannikov V.N., Tumanov A.V., Zakharov A.P., Gerasimenko A., 2016. Surface flaws behavior under tension, bending and biaxial cyclic loading. Int. J. Fatigue., 92 (2), 557-576. (b) Yarullin R.R., Ishtyryakov I.S., 2016. Fatigue Surface Crack Growth in Aluminum Alloys under Different Temperatures. Procedia Engineering, 160, 199-206. Shlyannikov V.N., 2013. T-stress for crack paths in test specimens subject to mixed mode loading. Eng. Fract. Mech., 108, 3 – 18. Shlyannikov V.N., Zakharov A.P., 2017. Generalization of Mixed Mode Crack Behaviour by the Plastic Stress Intensity Factor. Theoretical and Applied Fracture Mechanics, 91, 52-65. References