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- W3176492673 endingPage "127447" @default.
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- W3176492673 abstract "A modified four-point bending test was conducted on air-plasma sprayed (APS) thermal barrier coatings (TBC) to investigate the impact of bond coat (BC) topography tortuosity on the TBC fracture mechanics . The degree of BC tortuosity was quantified by the novel total thresholded summit area surface descriptor (S sth ) and was found to influence the crack path configuration, critical energy release rate (G c ) and crack propagation velocity ( ν prop ). Specimens with higher BC interface tortuosity and more compliant TBC microstructures displayed a reduced strain energy release rates (G c ≤ 79.90 J. m −2 ) and crack propagation velocities ( v prop ≤ 0.90 mm. s −1 ). Delamination was primarily governed by the degree of inter-splat cohesion and intra-splat segmentation, although the topography-induced inter-splat tortuosity still had a relevant impact on fracture mechanics. The correlation observed between these results and the lifetime of analogous thermally cycled specimens tested herein suggests that the BC interface can affect the effectiveness of the microstructural stress relaxation mechanisms and by extension the TBC durability. • Crack propagation was investigated in APS TBCs via in-situ modified four-point bending; • Higher BC tortuosity and compliant TBC microstructures showed reduced strain energy release rates and slower crack propagation • TBC delamination was primarily governed by the degree of near-interface inter-splat cohesion and intra-splat segmentation;" @default.
- W3176492673 created "2021-07-05" @default.
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- W3176492673 date "2021-09-01" @default.
- W3176492673 modified "2023-09-25" @default.
- W3176492673 title "Effect of bond coat topography on the fracture mechanics and lifetime of air-plasma sprayed thermal barrier coatings" @default.
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- W3176492673 doi "https://doi.org/10.1016/j.surfcoat.2021.127447" @default.
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