Experimental study of a metal-matrix composite |
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Authors: | D Post R Czarnek D Joh J Jo Y Guo |
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Institution: | (1) Engineering Science and Mechanics Department, Virginia Polytechnic Institute and State University, 24061 Blacksburg, VA |
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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.
Paper was presented at the 1986 SEM Spring Conference on Experimental Mechanics held in New Orleans, LA on June 8–13. |
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