Abstract
A method combining moiré-fringe patterns with strain-gage measurements is applied to the analysis of strain distribution in a double-lap joint specimen under pin load. The specimens are crossplied and woven-fabric graphite/epoxy composites. Fiber orientations for both of the composites are 0 deg/90 deg, and ±45 deg to the load direction. The results indicate that the strain distributions in the specimen are greatly influenced by the fiber orientation. In this experiment, these specimens were collapsed at the pin-hole edge by the pin load. However, the failure load is not always dependent on the fiber orientation.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Nishida, M. andSaito, H., “Stress Distribution in a Semi-infinite Plate Due to a Pin Determined by Interferometric Methods,”Experimental Mechanics,6 (5),273–279 (1966).
Hyer, M.W., andLiu, D.H., “Photoelastic Determination of Stress in Multiple-pin Connector,”Experimental Mechanics,23 (3),249–256 (1983).
Sampson, R.C., “A Stress-optic Law for Photoelastic Analysis of Orthotropic Composites,”Experimental Mechanics,10 (5),210–215 (1970).
Prabhakaran, R. andDally, J.W., “The Application of Photoorthotropic-elasticity,”J. Strain Anal.,12 (4),253–260 (1972).
Prabhakaran, R., “The Interpretation of Isoclinic in Photoorthotropic-elasticity,”Experimental Mechanics,16 (1),6–10 (1976).
Cernosek, J., “On Photoelastic Response of Composites,”Experimental Mechanics,15 (9),354–357 (1975).
Chandrashekhara, K., Abraham-Jacob, K. andPrabhakaran, R., “Toward Stress Freezing in Birefringent Orthotropic Composite Models,”Experimental Mechanics,17 (8),317–320 (1977).
Knight, C.E., Jr., “Orthotropic Photoelastic Analysis of Residual Stress in Filament-wound Rings,”Experimental Mechanics,12 (2),107–112 (1972).
Hyer, M.W. andLiu, D.H., “Stresses in a Quasi-isotropic Pin-loaded Connector Using Photoelasticity,”Experimental Mechanics,24 (1),48–53 (1984).
Chiang, F.P., “Techniques of Optical Spatial Filtering Applied to the Processing of Moire-fringe Patterns,”Experimental Mechanics,9 (9),523–526 (1969).
Koshide, S., “Analysis of Strain Distribution for Fiber Reinforced Composites by Moiré Methods,” Tech. Rep. Nat. Aero. Lab., TR-681 (1981).
Howland, R.C.J., “On the Stress in the Neighborhood of a Circular Hole in a Strip under Tension,”Phil. Trans. of the Roy. Soc., Series A, 229, 49–86 (1930).
Matzkanin, G.A., Burkhardt, G.L. and Teller, C.M., “Nondestructive Evaluation of Fiber Reinforced Epoxy Composites, a State-of-the-art Survey”, USAAVRADCOM Tech. Rep. TR-79-24 (April 1979).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Koshide, S. Investigation of the pin joints in composites by the moiré method. Experimental Mechanics 26, 113–118 (1986). https://doi.org/10.1007/BF02320001
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02320001