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A laminated plate theory analysis is developed to calculate the strain energy release rate associated with edge delamination growth in a composite laminate. The analysis includes the contribution of residual thermal and moisture stresses to the strain energy released. The strain energy release rate G increased when residual thermal effects were combined with applied mechanical strains, but then decreased when increasing moisture content was included. A quasi-three-dimensional finite-element analysis indicated identical trends and demonstrated these same trends for the individual strain energy release rate components. G1 and G11, associated with interlaminar tension and shear. An experimental study indicated that for T300/5208 graphiteepoxy composites, the inclusion of residual thermal and moisture stresses did not significantly alter the calculation of interlaminar fracture toughness from strain energy release rate analysis of edge delamination data taken at room-temperature ambient conditions.
Project materials engineer, Kentron International, Inc., Hampton, VA
Senior scientist, Analytical Services and Materials, Inc., Hampton, VA
Senior scientist, U.S. Army Aerostructures Directorate, NASA Langley Research Center, Hampton, VA
Stock #: CTR10320J