Strains from Projection Moire Data.
Final rept. Sep 81-Mar 82,
DAYTON UNIV OH RESEARCH INST
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The main objective of this program was to determine and evaluate the surface strains from out-of-plane deformations determined by the projection moire melthod of large surfaces experiencing static loads. The program consisted of three primary tasks 1 design of an experiment consisting of a four-point bending fixture and a 26x6x14 inch flat test specimen, moire device, strain gage instrumentation, and dial gages, and the collection of experimental data for various static loads 2 analytical prediction of the deflections and strains by small and large deflection beam theories and small deflection plate theory 3 computation of strains from the moire deflections by a number of numerical curve fitting techniques and 4 comparison of the strains determined from the moire technique with experimental and theoretical strains. Tests were conducted at loads from 50 to 300 pounds in 50 pound load increments and strains were computed from moire deflections by using second and third order polynomials and a second order Legendre polynomial. Both the deflections and strains were accurately determined for the flat surfaces investigated.
- Statistics and Probability
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