Residual surface stresses in laminated cross-ply fiber-epoxy composite materials |
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Authors: | Harold E Gascoigne |
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Institution: | (1) California Polytechnic State University, 93407 San Luis Obispo, CA |
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Abstract: | Residual (curing) stresses in a cross-ply laminated plate are related to the strains released when individual plies are separated.
Released displacements are determined using high-sensitivity moiré interferometry and linearized strain-displacement equations
are used to determine residual strains. Elastic orthotropic stress-strain relations are used to calculate residual stresses
remote from free-edges of a 9020/020/9020] graphite-epoxy cross-ply panel. The measured strains compare favorably with those predicted by laminated plate theory. In
a second example, the circumferential and radial residual strains and stresses at the end-section of a thick-walled cross-ply
graphite-epoxy cylinder are determined.
Paper was presented at the 1992 SEM Spring Conference on Experimental Mechanics held in Las Vegas NV on June 8–11. |
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