Abstract
Conventional photoelasticity and holographic interferometry could be successfully combined into holographic photoelasticity, which is able to give engineers isopachics, a family of the contour lines of the sum of principal stresses as well as isochromatics both solely and simultaneously. As an extension of this advanced technique developed for determining principal stresses independently to the photoelastic coating method, holographic coating method may be naturally inspired. Apart from holography, it is also possible to be used as an alternative method for yielding isopachics, which is composed of moire techniques and superposition of interference fringes produced by light waves from front and rear surfaces in transparent material adhered to reflective part of the structure. The light intensity equation governing the light fields in these newly developed methods was calculated analytically. A comparison of the experimental and theoretical fringe patterns was made. Improved simulation patterns generated by the light intensity equation and elastic stress distribution demonstrate the characteristics of these methods and some advantages in moire coating rather than holographic coating method.
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