McCartney, L N; Maxwell, A S (2002) Predicting through-thickness cracking in a two-layer coated system subject to axial loading and bending. NPL Report. MATC(A)138

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Abstract

Through-thickness cracking is one of the most important failure mechanisms for coatings, the consequences of which often lead to debonding of the interface and subsequent exposure of the underlying substrate to the environment. Whilst numerous test methods have been developed to measure through-thickness cracking there has been little detailed interpretation of the results in terms of fundamental properties, such as fracture energy. The main objective of this work was therefore to apply through-thickness cracking models to experimental data. The three test methods examined following industrial consultation were thermal, tensile and four-point bend. It has been concluded from the results that the most suitable test method for measuring through-thickness cracking appears to be the thermal fracture technique. This was experimentally the simplest technique to perform and as plastic deformation was not observed was also the least complicated to analyse.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MATC(A)138
Subjects:	Advanced Materials Advanced Materials > Materials Modelling
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2691

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