Abstract
New experimental methods continue to be proposed for determining the in-plane elastic constants of orthotropic composite materials, as no single method has been found completely satisfactory. In particular, the in-plane shear modulus is difficult to measure. In this paper, an orthotropic half-plane subjected to a concentrated edge load is proposed as a calibration specimen. Photoelastic calibration of orthotropic-birefringent composites is also difficult due to the need to conserve the commercially unavailable, difficult-to-make model materials and the absence of many closed-form solutions. In this paper, the orthotropic half-plane specimen is proposed for photoelastic calibration of birefringent-orthotropic model materials also. For elastic and photoelastic calibration of orthotropic materials, the least-squares procedure is used for processing the experimental data.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Sanford, R.J., “Application of the Least-squares Method to Photoelastic Analysis,” EXPERIMENTAL MECHANICS,20 (6),192–197 (June 1980).
Byron, E.L., “Photoelastic Evaluation of the Panel Shear Test for Plywood,”Symp. Shear and Torsion Testing, ASTM STP 289, 90–108 (1961).
Whitney, J.M., Stansbarger, D.L. andHowell, H.B., “Analysis of the Rail Shear Test — Applications and Limitations,”J. Comp. Mat.,5,24–34 (Jan. 1971).
Bergner, H.W., Davis, J.G. and Herakovich, C.T., “Analysis of Shear Test Methods for Composite Laminates,” Virginia Polytechnic Inst. and State Univ. Rep. No. E-77-14, Blacksburg, VA (1977).
Duggan, M.F., “An Experimental Evaluation of the Slottedtension Shear Test for Composite Materials,” EXPERIMENTAL MECHANICS,20 (7),233–239 (July 1980).
Chamis, C.S. andSinclair, J.H., “Ten-deg Off-axis Test for Shear Properties in Fiber Composites,” EXPERIMENTAL MECHANICS,17 (9),339–346 (Sept. 1977).
Arcan, M., Hashin, Z. andVoloshin, A., “A Method to Produce Uniform Plane-stress States with Applications to Fiber-reinforced Materials,” EXPERIMENTAL MECHANICS,18, (4),141–146 (April 1978).
Prabhakaran, R., “Applications of Transmission Photoelasticity to Composite Materials,” Developments in Composite Materials, Applied Science Publishers,2,75–99 (1981).
Prabhakaran, R., “Photo-Orthotropic-Elasticity: A New Technique for Stress Analysis of Composites,”Opt. Eng.,21,679–688 (July/Aug. 1982).
Dally, J.W. andPrabhakaran, R., “Photo-orthotropic-elasticity,” EXPERIMENTAL MECHANICS,11 (8),346–356 (Aug. 1971).
Prabhakaran, R., “On the Stress-Optic Law for Orthotropic Model Materials in Biaxial Stress Fields,” EXPERIMENTAL MECHANICS,15 (1),29–34 (Jan. 1975).
Bugakov, I.I. andGrakh, I.I., “Investigation of the Photoelastic Method for Anisotropic Bodies,”Leningradskii Universitet Vestnik, Matematika, Mekhanika Astronomiia,72,102–108 (May 1968).
Prabhakaran, R., “Photoelastic Calibration of Orthotropic Model Materials,”Opt. Acta,27,429–433 (April 1980).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Prabhakaran, R., Chermahini, R.G. Application of the least-squares method to elastic and photoelastic calibration of orthotropic composites. Experimental Mechanics 24, 17–21 (1984). https://doi.org/10.1007/BF02323200
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02323200