An improved Vickers indentation fracture toughness model to assess the quality of thermally sprayed coatings.

Faisal, N.H.; Ahmed, R.; Prathuru, A.K.; Spence, S.; Hossain, M.; Steel, J.A.

Abstract

This study presents an improved approach to the quality assessment of thermally sprayed coatings. Measurements were carried out on five different coatings. Since it is the overall extent of surface cracking during Vickers indentation that is indicative of the volumetric damage, the surface crack length was measured, including the radial cracks, edge cracks, and other cracks around the indentation. It is concluded that the proposed model provides a way forward for determining the fracture toughness (K1c) of brittle materials where no radial cracks are developed. An elastic-plastic finite element simulation of the Vickers indentation test was conducted to locate the stress fields.

Citation

FAISAL, N.H., AHMED, R., PRATHURU, A.K., SPENCE, S., HOSSAIN, M. and STEEL, J.A. 2014. An improved Vickers indentation fracture toughness model to assess the quality of thermally sprayed coatings. Engineering fracture mechanics [online], 128, pages 189-204. Available from: https://doi.org/10.1016/j.engfracmech.2014.07.015

• Journal Article Type: Article
• Acceptance Date: Jul 17, 2014
• Online Publication Date: Jul 29, 2014
• Publication Date: Sep 30, 2014
• Deposit Date: May 5, 2016
• Publicly Available Date: May 5, 2016
• Journal: Engineering fracture mechanics
• Print ISSN: 0013-7944
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 128
• Pages: 189-204
• DOI: https://doi.org/10.1016/j.engfracmech.2014.07.015
• Keywords: Thermal spray coatings; Vickers indentation; Fracture toughness (K1c); Edge crack model; Finite element analysis
• Public URL: http://hdl.handle.net/10059/1461