On stresses induced in a thermal barrier coating due to indentation testing

TLDR: In this article, the authors investigated the experimental results by numerical simulations incorporating the material microstructure and found that indentation testing of multilayered coated structures might not induce the delamination in the overall weakest interface and therefore the test results must be evaluated with care.

About: This article is published in Computational Materials Science.The article was published on 2009-02-01 and is currently open access. It has received 18 citations till now. The article focuses on the topics: Indentation & Delamination.

Figures

Table 1 Geometry of the columnar model (ICS, intercolumnar spacing, Fig. 4)

Fig. 11. The interfacial stresses for maximum indentation forces of 100, 200, and 500 N: (A) tensile stress and (B) shear stress for the homogeneous top coat; (C) tensile stress and (D) shear stress for the columnar coat. TGO–bond coat interface, 100 h aged conditions assumed (Tables 1 and 2).

Fig. 10. The interfacial stresses (A) tensile stress and (B) shear stress, for 100 N maximum indentation force for the three interfaces. Columnar top coat, 100 h aged conditions assumed (Tables 1 and 2).

Fig. 6. Out-of-plane stresses (r22) for homogeneous top coat at maximum load (left column) and after unloading (right column), for maximum indentation forces of 100, 200, and 500 N (top to bottom). Hundred hours of aged conditions assumed (Tables 1 and 2).

Fig. 9. Shear stresses (r12) for columnar top coat at maximum load (left column) and after unloading (right column), for maximum indentation forces of 100, 200, and 500 N (top to bottom). Hundred hours of aged conditions assumed (Tables 1 and 2).

Fig. 15. The interfacial stresses for as-coated, 50 h and 100 h aged specimens. Maximum indentation force 100 N (A) tensile stress and (B) shear stress; and for 500 N (C) tensile stress and (D) shear stress. Columnar coat, TGO–bond coat interface.

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