Finite Element Analysis System for the Mechanical Behavior of Oriented Fiber Composite Materials under Combined Stresses.
CASE WESTERN RESERVE UNIV CLEVELAND OHIO DIV OF METALLURGY AND MATERIALS SCIENCE
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A study was conducted on the effects of biaxial stress states on composite deformation, especially the plastic flow behavior of unidirectional composites under multiaxial loading conditions. An analytical model has been developed which incorporated the effects of plastic flow in the composite under any multiaxial loading without shear. This model relates the internal stress distributions in each of the constituents of the composite calculated by the finite element method to the externally applied loads, thus enabling the stress-strain curve of the entire composite to be generated for the particular loading state. Experimental data were obtained in hydraulic bulge tests, four point bending, hydrostatic pressurization and uniaxial tension. The bulk of this work was performed on A1-50 percent B unidirectional fiber composite material. Implications of the analytical and experimental results toward the establishment of a plasticity theory for fiber composites are discussed. Particular reference is made to the dependence of plastic behavior on hydrostatic loading, the development of a hardening rule, and the presence and role of corners in the flow surface. Author, modified-PL
- Laminates and Composite Materials