Test validation of environmental barrier coating (EBC) durability and damage tolerance modeling approach

Ali Abdul-Aziz; Ali Najafi; Frank Abdi; Ramakrishna T. Bhatt; Joseph E. Grady

doi:10.1117/12.2045914

31 March 2014 Test validation of environmental barrier coating (EBC) durability and damage tolerance modeling approach

Ali Abdul-Aziz, Ali Najafi, Frank Abdi, Ramakrishna T. Bhatt, Joseph E. Grady

Proceedings Volume 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014; 90580P (2014) https://doi.org/10.1117/12.2045914
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2014, San Diego, California, United States

Abstract

Protection of Ceramic Matrix Composites (CMCs) is rather an important element for the engine manufacturers and aerospace companies to help improve the durability of their hot engine components. The CMC’s are typically porous materials which permits some desirable infiltration that lead to strength enhancements. However, they experience various durability issues such as degradation due to coating oxidation. These concerns are being addressed by introducing a high temperature protective system, Environmental Barrier Coating (EBC) that can operate at temperature applications^{1, 3} In this paper, linear elastic progressive failure analyses are performed to evaluate conditions that would cause crack initiation in the EBC. The analysis is to determine the overall failure sequence under tensile loading conditions on different layers of material including the EBC and CMC in an attempt to develop a life/failure model. A 3D finite element model of a dogbone specimen is constructed for the analyses. Damage initiation, propagation and final failure is captured using a progressive failure model considering tensile loading conditions at room temperature. It is expected that this study will establish a process for using a computational approach, validated at a specimen level, to predict reliably in the future component level performance without resorting to extensive testing.

Citation Download Citation

Ali Abdul-Aziz, Ali Najafi, Frank Abdi, Ramakrishna T. Bhatt, and Joseph E. Grady "Test validation of environmental barrier coating (EBC) durability and damage tolerance modeling approach", Proc. SPIE 9058, Behavior and Mechanics of Multifunctional Materials and Composites 2014, 90580P (31 March 2014); https://doi.org/10.1117/12.2045914

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