Showing papers on "Micromechanics published in 1968"

Invariant properties of composite materials.

Abstract: : Invariant properties of the elastic coefficient matrices of laminated composite plates are presented. The use of these invariants in materials evaluation and design optimization is discussed. Simple formulas, based upon micromechanics results, are derived for the invariants in terms of constituent material properties. (Author)

Ribbon Reinforcement of Composites

Abstract: : A clear demonstration of the potential of ribbon-shaped reinforcements in composite materials applications is presented. From a micromechanics analysis, supported by experimental results. Ribbon reinforcement offers superior stiffness properties in the plane of the lamina. The macromechanics analysis introduces the concept of a hybrid composite in which the engineer may combine the outstanding strength properties of fibers with the superior stiffness properties offered by ribbon reinforcements. It is pointed out that the low strength observed for glass-ribbon composites is a consequence of fabrication procedures and does not correspond to the theoretical limiting strength of ribbon reinforcements. The use of ribbon-shaped reinforcements also leads to composites which will have very small isotropic thermal expansion coefficients in the plane of the plate. Thus, ribbon reinforcements provide an attractive means of achieving intermediate to high performance composite possessing dimensional stability. (Author)