10
Brittle Coating Technique
10.1 INTRODUCTION
The principle of stress analysis involves the adherence of a thin coating (resin- or ceramic-based) brittle in nature on the surface of a specimen. When the specimen is subjected to external loads, the thin brittle coating cracks under tensile stresses. Strains produced in specimen are transmitted to the coating resulting in coating cracks. From the threshold strain of coating, i.e. minimum strain required to cause the coating to crack, determined through calibration of coating, the stresses in specimen are determined. The behaviour of the coating is quite complicated as it depends on the number of parameters influencing the behaviour of the coating, such as coating thickness, coating temperature, ...
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