An Experimental and Numerical Study of a CoNiCrAlY Coating Using Miniature Specimen Testing Techniques

Sun, Wei; Wen, Wu; Jackson, George; Li, Hezong

Abstract

Small punch tensile (SPT) tests have been carried out for a CoNiCrAlY coating at room temperature (RT), 500°C and
700°C. Highly re-producible results have been obtained for SPT at 700°C while the formation of early cracking at lower
temperatures tends to compromise the repeatability of the tests. An alternative novel miniature specimen testing
method has been developed and used for the miniature tensile tests of the CoNiCrAlY coating in the same
temperature range. Good agreements have been achieved between the SPT and miniature tensile testing results
regarding the ductile to brittle transition temperature (DBTT). Excellent repeatability has been achieved over the full
range of the temperature for the miniature tensile tests. An inverse approach has been developed and used to extract
the mechanical properties of the material from the miniature tensile tests, using a temperature-dependent Johnson-
Cook model. Finite element (FE) modelling of the SPT tests, including damage evolution, has been carried out using
the extracted material properties to give comparable predictions of the SPT testing results, such as the load displacement
curves and the approximate locations of the fracture failures.

Citation

Sun, W., Wen, W., Jackson, G., & Li, H. (2019). An Experimental and Numerical Study of a CoNiCrAlY Coating Using Miniature Specimen Testing Techniques. International Journal of Mechanical Sciences, 157-158, 348-356. https://doi.org/10.1016/j.ijmecsci.2019.04.001

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2019
• Online Publication Date: Apr 26, 2019
• Publication Date: 2019-07
• Deposit Date: Apr 1, 2019
• Publicly Available Date: Apr 27, 2020
• Journal: International Journal of Mechanical Sciences
• Print ISSN: 0020-7403
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 157-158
• Pages: 348-356
• DOI: https://doi.org/10.1016/j.ijmecsci.2019.04.001
• Keywords: Mechanical Engineering; General Materials Science; Mechanics of Materials; Civil and Structural Engineering; Condensed Matter Physics
• Public URL: https://nottingham-repository.worktribe.com/output/1722436
• Publisher URL: https://www.sciencedirect.com/science/article/pii/S0020740318337895