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Creep Crack Growth in Surface Cracked Specimens and in Nickel-Based Super Alloy at Elevated Temperature

Mayank Bansal

Abstract


In this study, crack growth under steady state creep conditions is analyzed. A theoretical framework is introduced in which the constitutive behavior of the bulk material is described by power-law creep. In particular, simple critical displacement, empirical Kasyanov type damage and micromechanical based interface models are used. We also demonstrate how parameters within the models can be obtained from creep deformation, creep rupture and crack growth experiments. The numerical approaches to simulate creep crack growth can be divided into two distinct categories. The first category is employing conventional fracture mechanics, in which the rate of crack growth is predicted by correlating it with a fracture mechanics parameter. The second category gaining much attention is based on damage mechanics concept. In this paper, three dimensional analyses of creep crack growth are performed for 316 stainless steel specimens subjected to tension at elevated temperature with a semi-elliptical surface crack. Using two independent finite element analyses based on the fracture mechanics and continuum damage mechanics respectively, crack growth behaviors including crack profile development, crack size and propagation time are investigated and compared with each other and corresponding experimental data. The comparisons enable to show the different capabilities of the two approaches in predictions of creep crack growth.

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References


S.D. Smith, J.J. Webster, T.H. Hyde. Creep behaviour of a stationary, semicircular surface crack, Eng Fract Mech. 1988; 30: 105–16p.

K.B. Yoon, T.G. Park, A. Saxena. Creep crack growth analysis of elliptic surface cracks in pressure vessels, Int J Pres Ves Pip. 2003; 80: 465–79p. 13th International Conference on Fracture. June 16–21, 2013, Beijing, China 9.

Y. Kayser, S. Marie, C. Poussard, C. Delaval. Leak before break procedure: recent modification of RCC-MR A16 appendix and proposed improvements, Int J Pres Ves Pip. 2008; 85: 681–93p.

J.F. Wen, S.T. Tu, J.M. Gong, W. Sun. Creep fracture mechanics parameters for internal axial surface cracks in pressurized cylinders and creep crack growth analysis, Int J Pres Ves Pip. 2011; 88: 452–64p.

J. Lemaitre, R. Desmorat. Engineering Damage Mechanics: Ductile, Creep, Fatigue and Brittle Failures. Berlin: Springer-Verlag; 2005.

C.S. Oh, N.H. Kim, Y.J. Kim, C. Davies, K. Nikbin, D. Dean. Creep failure simulations of 316H at 550 degree C: Part I: method and validation, Eng Fract Mech. 2011; 78: 2966–77p.

C.S. Oh, N.H. Kim, S.H. Min, Y.J. Kim. Finite element damage analysis for predictions of creep crack growth, In: Proceedings of the ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. Washington, USA; 2010.

T.H. Hyde, M. Saber, W. Sun. Testing and modelling of creep crack growth in compact tension specimens from a P91 weld at 650 degree C, Eng Fract Mech. 2010; 77: 2946–57p.

C.J. Hyde, T.H. Hyde, W. Sun, A.A. Becker. Damage mechanics based predictions of creep crack growth in 316 stainless steel, Eng Fract Mech. 2010; 77: 2385–402p.

M. Yatomi, M. Tabuchi. Issues relating to numerical modelling of creep crack growth, Eng Fract Mech. 2010; 77: 3043–52p.

M. Yatomi, C.M. Davies, K.M. Nikbin. Creep crack growth simulations in 316H stainless steel, Eng Fract Mech. 2008; 75: 5140–50p.

H.T. Pang, P.A.S. Reed. Fatigue crack initiation and short crack growth in nickel-base turbine disc alloys – the effects of microstructure and operating parameters, Int J Fatigue. 2003; 25: 1089–99p.

S. Dalby, J. Tong. Crack growth in a new nickel-based superalloy at elevated temperature, part I: effects of loading waveform and frequency on crack growth, J Mater Sci. 2005; 40: 1217–28p.

S. Suresh. Fatigue of Materials. Cambridge University Press, Cambridge, UK Sehitoglu H, Sun W (1989) The significance of crack closure under high temperature fatigue crack growth with hold periods, Eng Fract Mech. 1998; 33: 371–88p.

S. Pommier, P. Bompard. Bauschinger effect of alloys and plasticity-induced crack closure: A finite element analysis, Fatigue Fract Eng Mater Struct. 2000; 23: 129–39p.

L.G. Zhao, J. Tong, J. Byrne. The evolution of the stress–strain fields near a fatigue crack tip and plasticity-induced crack closure revisited, Fatigue Fract Eng Mater Struct. 2004; 27: 19–29p.

L.G. Zhao, J. Tong. A viscoplastic study of crack-tip deformation and crack growth in a nickel-based super alloy at elevated temperature, J Mech Phys Solids. 2004; 56: 3363–78p.


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