Analysis of Fracture Behavior of Metal/Ceramic Functionally Graded Materials under Thermal Stress

Abstract:

In this presented work, a coupled thermo-mechanical model is employed to analyze the thermo-mechanical behavior of ceramic functionally graded materials (FGMs) and the crack formation and propagation process of ceramic coating was simulated step in step and step by step using the RFPA (Realistic Failure Process Analysis) ^2D-Thermo code. The thermal shock fracture behavior is discussed based on the basis of the simulated crack morphology and elucidated the mechanism of crack deformation and crack propagation. The state change from compression to tension whose magnitude is large enough to exceed the tension strength of ceramic causes the vertical crack. The numerical results agreed well with the experimental results in the previous literature.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 2200-2205
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.2200
• Online since: August 2013
• Authors: Cheng Fan
• Keywords: Crack Propagation, Fracture Mechanism Thermal Barrier Coatings, Functionally Graded Material (FGM), Thermal Stress

References

[1] N. Cherradi, A. Kawasaki and M. Gasik: Compos Eng. 4(1999), p.883.

[2] D. H. Allen, C. E. Harris and S. E. Groves: Int. J. Solids Strut. 23(1987), p.1301.

[3] R. A. Miller, C. E. Lowell: Thin Solid Films. 95(1982), p.265.

[4] J. B. Henderson and T. E. Wiecek: Heat and Mass Transfe. 22(1988), p.275.

[5] J.L. Wang, S.L. Crouch and S.G. Mogilevskaya: Composites Sci. Tech. 66(2006), p.1.

[6] C.A. Tang, Y.F. Fu, P. Lin: Acta Materiae Compositae Sinica. 16(1999), p.110.

[7] W. Weibull: Journal of Applied Mechanics. 18(1951), p.293.

[8] C.A. Tang: Int J Rock Mech Min Sci. 34 (1997), p.249.

[9] C.A. Tang, H.Y. Liu, Y. Tsui, L.G. Tham: Int J Rock Mech Min Sci. 37 (2000), p.555.

[10] A. Kawasaki: Eng Fract Mech. 69(2002), p.1713.