Paint coating characterization for thermoelastic stress analysis of metallic materials

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Description/Abstract

In thermoelastic stress analysis (TSA) it is normal practice to coat metallic specimens with
black paint to enhance and standardize the surface emissivity. It is assumed that the paint
coating has no effect on the thermal emission from the specimen, but it is well known that the
response is sensitive to paint coating thickness, particularly at higher frequencies. In this paper
the effects of loading frequency and paint coating thickness on the thermoelastic response are
investigated. The thermoelastic response is compared to theory, and optimum test conditions
and coating characteristics are suggested. The motivation for the work is to develop a
TSA-based means of residual stress assessment, where the measurement of much smaller
temperature changes than those that are resolved in standard TSA is required; therefore the
analysis is much more sensitive to the effects of the paint coating. However, the work
presented in this paper is relevant to a wide range of TSA investigations and presents data that
will be of interest to all practitioners of TSA.