Abstract
This paper presents a new method to measure surface strain without contacting specimens using metal foil gauges assisted by the laser speckle method. If a metal foil (such as aluminum, copper or nickel) is pasted on a specimen and the specimen is loaded cyclically, slip bands are produced on the metal foil by fatigue. The occurrence of the slip bands is dominated by the strain amplitude of the specimen surface and the number of loading cycles. There is a direct relation between density of the slip bands and the strain amplitude or loading cycles. Thus the surface strain can be estimated by observing the surface change. The method presented in this paper involves non-contact strain measurement by the application of the speckle technique for detection of the surface change due to occurrence of slip bands. In this experiment, aluminum foil was used and the result showed that it is possible to detect surface change of the foil surface by cyclic loading using the laser speckle method and there is a direct relation between speckle intensity distribution and loading cycles under constant strain amplitudes. It is also possible to estimate surface strain by observing the distribution of laser speckle intensity.
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