Published: Jan 1985
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A new material design method of laminated fibrous composite plates with required flexural stiffness is proposed. The selection of kinds of fibers and matrices and the determination of fiber orientation angles can be done directly from the imposed conditions on flexural stiffness of laminated plates.
The laminated composites intended for this study are multiple balanced angle-ply symmetric laminates with one kind of unidirectional lamina.
A newly constructed diagram for flexural lamination parameters which are functions of the fiber orientation angles, and which appeared in Tsai's expression for evaluating the flexural stiffness of laminates, made it possible to determine the design specifications based on flexural effective engineering constants of laminates. A certain stacking sequence of laminates is indicated as a point in the diagram on which contours of flexural stiffness can be drawn. Using these contour lines, the design specification is easily determined as a point on this diagram. Thus, the point can be called a design point.
It became possible to specify the fiber orientation angle of each ply and the stacking sequence using the flexural lamination parameters indicated as the point on the diagram.
composite materials, laminated plates, material design, flexural stiffness, stacking sequence
Professor, Materials System Research Laboratory, Kanazawa Institute of Technology, Kanazawa,