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Showing papers on "Composite laminates published in 1968"


01 Mar 1968
TL;DR: The use of these invariants in materials evaluation and design optimization is discussed in this article, where simple formulas, based upon micromechanics results, are derived for the invariant in terms of constituent material properties.
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)

271 citations


Journal ArticleDOI
TL;DR: In this paper, a clear demonstration of the potential of ribbon-shaped reinforcements in composite materials applications is presented from a micromechanics analysis, supported by experimental results, and 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.
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)

74 citations


Patent
23 Feb 1968

7 citations



Journal ArticleDOI
TL;DR: In this paper, the authors define engineering constants of laminated materials in terms of the in-plane compliance matrix, which can be expressed in terms either of the compliance matrix or the stiffness matrix.
Abstract: Certain difficulties arise in defining engineering constants of laminated materials. They can be expressed in terms of the in-plane compliance matrix, but cannot always be in terms of the in-plane stiffness matrix unless the laminated material is balanced as well as orthotropic. This fact often leads to confusion among experimental data reported. Laminated plate theory, which is applicable to fiber reinforced composites [1] , is often based on the constitutive relationship in terms of the stiffness matrix:

3 citations