DEVELOPMENT OF DESIGN CRITERIA FOR COMPOSITE MATERIALS.
Summary technical rept. 2 Mar 66-1 Mar 67,
CASE INST OF TECH CLEVELAND OH DEPT OF METALLURGY
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A systematic investigation was undertaken to identify the variables involved in the rheological interactions between components of oriented fiber composites, and to define rigorously the inter-relations among the variables. The study included loading that produced both elastic and plastic response in the composite. The ultimate goal of the work was the establishment of a design envelope for filamentary composites in which these interactions could be utilized to produce optimum synergistic effects. A simplified analytical model representing a simulation of densely-packed multi-filament composites was developed and tested experimentally to identify the significant design parameters. Experimental verification of the simplified analytical model was achieved, but only when residual stresses in the fabricated simulator were consisered. Residual stresses were measured experimentally to be of the order of the yield stress of the matrix material. The correlation between theory developed with the simulator model and close-packed filamentary composite behaviour was evaluated. The theoretically predicted synergistic effects resulting from rheological interaction between composite components were experimentally observed in both of these composite types. At the same time, limitations of the analytical model were revealed and direction for further refinement of this model was thereby indicated. Author
- Laminates and Composite Materials