Comprehensive Numerical Simulation of Stress and Damage Fields under Thermo-Mechanical Loading for TBC-Coated Ni-Based Superalloy

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A finite element analysis code was developed to accurately predict stress and damage fields in thermal barrier coatings (TBCs) systems subjected to thermo-mechanical loadings. An inelastic constitutive equation for TBCs, and a Chaboche-type viscoplastic constitutive equation for Ni-based super alloys (IN738LC) were employed to simulate high temperature creep and cyclic deformation. Simulations of the TBC/IN738LC system subjected to two types of loading, namely, a triangle-wave loading and a GT-operation loading, were performed using the developed analysis code. The results confirmed that the stress and damage fields in the TBC/IN738LC system could be simulated accurately, and provided us with credible results regarding the crack occurrence. Additionally, the analysis under the GT-operation loading conditions revealed that a peak stress generated during the start-up operation would lead to delamination of the TBC, while a peak stress at the shut-down would lead to cracking in the substrate.

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Periodical:

Edited by:

Luis Rodríguez-Tembleque, Jaime Domínguez and Ferri M.H. Aliabadi

Pages:

137-142

Citation:

H. Katori et al., "Comprehensive Numerical Simulation of Stress and Damage Fields under Thermo-Mechanical Loading for TBC-Coated Ni-Based Superalloy", Key Engineering Materials, Vol. 774, pp. 137-142, 2018

Online since:

August 2018

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$38.00

[1] M. Arai, Acta Metallurgica Sinica, Vol. 24, No. 2 (2011), pp.161-168.

[2] M. Arai, Surface and Coatings Technology, Vol. 304 (2016), pp.542-552.

[3] M. Yaguchi, M. Yamamoto and T. Ogata, International Journal of Plasticity, Vol. 18 (2002), pp.1111-1131.

[4] T. Sakai, T. Ogata, A. Nomoto and K. Watanabe, Proceedings of ASME Turbo Expo 2000: Power for Land, Sea and Air, Paper No. 2000-GT-049 (2000), Munich, Germany.