Analytical Approach to Composite Behavior.

The applicability of the binary composite model has been completely generalized for any combination and arrangement of materials. This refinement has eliminated the previous restriction where only composite cylinders in which the core member would yield before the case member could be treated analytically. It was found that the residual stresses in the composite induced during cooling from fabrication temperatures needed to be analyzed and incorporated into subsequent axial loading predictions. The residual stresses, which result from dissimilar thermal expansions of the components of composites, were predicted analytically and compared to the experimentally determined values for OFHC copper core with a 4340 steel case and OFHC copper core with a maraging steel case. Prestrains into the elastic-plastic behavioral region were emphasized. A double concentric model was developed to assess the seriousness of the presence of an unconstrained outer surface of the models. (Author)