Abstract
Time-dependent photomechanical model materials will not, in general, exhibit a one-to-one relationship between the instantaneous stress and the relative retardation. Due to the complicated nature of this relationship, it is often more accurate to use the analog method of data reduction. This method consists of reproducing the fringe-order history observed in the model in a tensile specimen of the model material and recording the corresponding stress history. Two servo systems are described in this report which may be programmed to produce a desired fringe-order history in a time-dependent tensile specimen.
Similar content being viewed by others
References
Durelli, A. J. and Riley, W. F., Introduction to Photomechanics, Prentice-Hall (1965).
Coker, E. andFilon, L., Treatise on Photoelasticity, London, Cambridge University Press (1931).
Dill, E. H. and Fowlkes, C. W., “Photoviscoelasticity,” NASA CR-444 (May 1966).
Daniel, I. M., “Two-Dimensional Dynamic Stress Analysis in a Nonelastic Material,” Tech. Doc. Report No. RTD-TDR-63-3059, Air Force Weapons Lab., Kirtland Air Force Base, N. M.
Theocaris, P. S., “A Review of the Rheo-Optical Properties of Linear High Polymers,”Experimental Mechanics,5 (4)105–114 (1965).
Frocht, M. M. and Thomson, R. A., “Studies in Photoplasticity”, Proc. Third U. S. Natl. Cong. Appl. Mech. (June 1958).
Arenz, R. J., Ferguson, C. W., andWilliams, M. L., “The Mechanical and Optical Properties of a Solithane 113 Composition,”Experimental Mechanics,7 (4)183–188 (1967).
Fowlkes, C. W., “Two Photoviscoelasticity Experiments Using Analog Data Reduction,”Experimental Mechanics,17 (1)41–46 (1967).
Mindlin, R. D., “A Muthematical Theory of Photoviscoelasticity,”Jnl. Appl. Phys.,20,206–216 (1949).
Foulkes, C. W., “Photoviscoelastic Model Testing,” NASA CR-1289 (February 1969).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Fowlkes, C.W. Two systems for automatic reduction of time-dependent photomechanics data. Experimental Mechanics 10, 64–71 (1970). https://doi.org/10.1007/BF02320134
Issue Date:
DOI: https://doi.org/10.1007/BF02320134