Deflection measurements using moiré gap effect
The moiré gap equation originally derived by Sciammarella and Chiang has been generalized to include linear and rotational mismatches. The equation is then applied to the measurement of deflection of beams and plates. The method has the advantages of being simple in comparison with other optical whole-field methods. The application of moiré gap effect to the study of dynamic problems is also discussed.
KeywordsMechanical Engineer Fluid Dynamics Dynamic Problem Deflection Measurement Rotational Mismatch
Unable to display preview. Download preview PDF.
- 1.Dantu, P., “Utilisation des Resaux pour l'etude des Deformations”Laboratoire Central des Ponts et Chaussees, Paris, Publication 57-6, (1957).Google Scholar
- 2.Morse, S., Durelli, A. J. andSciammarella, C. A., “Geometry of Moiré Fringes in Strain Analysis,”Jnl. of the Engrg. Mech. Div., Proc. ASCE,86 (EM4),55–74 (Aug.1960).Google Scholar
- 3.Sciammarella, C. A. andDurelli, A. J., “Moiré Fringes as a Means of Analyzing Strains,”Trans. ASCE,127 Part I,55–74 (1962).Google Scholar
- 4.Chiang, F. P., “A Method to Increase the Accuracy of Moiré Method,”Jnl. of the Engrg. Mech. Div., Proc. ASCE,91 (EM1),137–149 (Feb.1965).Google Scholar
- 5.Sciammarella, C. A. andChiang, F. P., “Gap Effect on Moiré Patterns,”Zeitschrift für angewante Mathematik und Physik,19 (2),326–333 (1968).Google Scholar
- 7.Chiang, F. P., “Determination of Signs in Moiré Method,”Jnl. of the Engrg. Mech. Div., Proc. ASCE,95 (EM6),1379–1391 (Dec.1969).Google Scholar
- 8.Sciammarella, C. A. and Chiang, F. P., “Dynamical Stresses and Strains in Propellant Grains,” 6th Annual Mechanical Behavior Working Group Meeting of ICRPG, Jet Propulsion Laboratory, Pasadena, Calif., Dec. 1967, CPIA Publication,1 (158), 219–232 (Oct. 1967).Google Scholar