High Sensitivity Moire
Experimental Analysis for Mechanics and Materials
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Beschreibung
Moiré patterns (which form when two regular patterns of comparable frequency interfere) are sensitive indicators of changes of shape as objects rotate, heat up, or are otherwise affected by external forces. Applications include nondestructive testing and evaluation, and quality and process control. This text explains the theory and practice of physical measurements by high-sensitivity moiré - principally moiré interferometry, focusing on the mechanics and micromechanics of materials and structural elements. Moiré interferometry is unique in providing maps of in-plane displacements from which one can directly derive normal and shear strains. Typical moiré sensitivities are on the order of 2-4 fringes per fm displacement, and one can reach sensitivities of 17 nm per fringe contour. Applications discussed include: advanced composite materials, thermal stresses, electronic packaging, fracture, metallurgy, time-dependence, and strain gage calibration. The methods discussed in the text can be applied for whole-field measurements on nearly solid and solid bodies. New results from previously unpublished studies are included.
Autor*in
Daniel Post