The Difficult Choice,
OAKLAND UNIV ROCHESTER MICH SCHOOL OF ENGINEERING
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It is necessary to weight the advantages and limitations of the numerous methods available today for the analyses of displacements, strain, and stresses. Systematic studies are lacking on this subject. In this paper after comments are made on several theoretical approaches, in particular approximates methods, attention is concentrated on experimental methods and considerations are made on the relative merits of 1 photoelasticity, moire, brittle and photoelastic coatings, gages, grids, holography and speckle to solve two-dimensional problems 2 photoplasticity and moire to solve problems in plasticity 3 photo-ortho-elasticity, photoelastic coatings and moire to solve anisotropic problems 4 the methods used to solve problems in dynamic photoelasticity 5 the methods used in three-dimensional photoelasticity, and 6 projected gratings, shadow-moire and holography to analyze bent plates. General considerations are also made on the relative merit of whole-field methods, in comparison with point-by-point methods. Finally, an attempt is made at evaluating merit of the finite-element method in respect to the experimental stress analysis methods.