文档介绍：Residual Surface Stresses in Laminated Cross-ply
Fiber-posite Materials
by Harold E. Gascoigne
ABSTRACT--Residual (curing) stresses in a cross-ply and the second in a flat cross-ply panel. 2 Neither of these
laminated plate are related to the strains released when studies presents a unified experimental procedure which
individual plies are separated. Released displacements are results in determination of the residual stresses at prese-
determined using high-sensitivity moir6 interferometry and lected locations. It is the goal of this paper to present a
linearized strain-displacement equations are used to deter- significant step toward such a unified procedure Only
mine residual strains. Elastic orthotropic stress-strain rela-
cross-ply laminates are considered in this paper in which
tions are used to calculate residual stresses remote from
free-edges of a [902o/02o/902o] graphite-epoxy cross-ply representative residual stresses are determined in a flat
panel. The measured pare favorably with those panel and in a cylinder
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-ep- Approach
oxy cylinder are determined. During cooling from the curing temperature, certain
plies contract more than their neighbors, leading to locke