Detailed surface displacement measurements have been made on the surface of a thermally deformed cylinder using a real-time holographic interferometry technique to measure the cartesian components of surface displacement at any surface point in the field of view. No assumptions were made as to the type and direction of displacements being measured and the resulting equations were analysed using a computer analysis package (I)† developed at the Polytechnic of Wales. For comparative purposes, elastic finite-element programs working on experimental temperature distributions were used in a theoretical model of the experiments.
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