Abstract
A metal-matrix specimen was investigated using moiré interferometry with 2400 ℓ/mm (60,960 ℓ/in.). The specimen was a 6-ply [0/±45] s boron-aluminum tensile coupon with a central slot. The unequal deformations in fibers and matrix were evident. Special attention was given to a plastic slip zone in the matrix. Normal and shear strains were calculated in the slip zone; the shear-strain concentration factor rose dramatically with the onset of plastic slip and continued to rise gradually with load to 95 percent of the failure load. The precipitous change from maximum tensile strain in one fiber to zero tensile strain in the neighboring fiber was accommodated by the very high shear strain in the matrix in the slip zone. Experimental considerations are discussed: shear strains are independent of rigid-body rotations; simplified strain calculations are justified; averaging across the narrow slip region and the influence of finite thickness of the specimen grating contribute to underestimation of peak strains.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Post, D., Czarnek, R., Joh, D., Jo, J. and Guo, Y., “Elastic-Plastic Deformation of a Metal-Matrix Composite Coupon with a Central Slot,” NASA Contractor Rep. 178013 (Nov. 1985).
Post, D., “Moiré Interferometry at VPI & SU,”Experimental Mechanics,23 (2),203–211 (June 1983).
Post, D., “Moiré Interferometry,”Handbook of Experimental Mechanics, ed. A.S. Kobayashi, Prentice Hall, Englewood Cliffs, NJ (1986).
Post, D., “The Moiré Grid-analyzer Method,”Experimental Mechanics,5 (11),369–377 (1965).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Post, D., Czarnek, R., Joh, D. et al. Experimental study of a metal-matrix composite. Experimental Mechanics 27, 190–194 (1987). https://doi.org/10.1007/BF02319473
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02319473