Structural Behavior of Composite Materials, Volume 71
This study is concerned with the analysis of the structural behavior of composite materials. It is shown that composite materials can be designed to produce a wide range of mechanical properties. Thus, a structural designer now has at his disposal an added dimension in optimum design - the materials optimization. Two types of composite materials are investigated: the unidirectional fiber reinforced composite and the laminated anisotropic composite. Analytical relations are derived between the composite material coefficients and the geometric and material parameters of the constituents. Test specimens made of filament-wound materials are used. The experimental results show that the relations derived in this study are more accurate than existing theories, which include the netting analysis. Reliable data on filament-wound materials, which are now available for the first time, can be used for future investigations of the behavior of filament-wound structures.
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CROSSPLY COMPOSITES THEORY
CROSSPLY COMPOSITES EXPERIMENTAL
ANGLEPLY COMPOSITES EXPERIMENTAL
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analytical functions angle-ply composite axial stiffness axis beams behavior of composite behavior of filament-wound composite material matrix composite moduli constituent materials constitutive equation contiguity factor continuum analysis cross-ply composite cross-ply ratio data on filament-wound Elastic Moduli elastic symmetry experimental results EXPERIMENTAL VERIFICATION fiber filament-wound materials geometric and material geometric parameters Glass Reinforced Plastic Hashin Hooke's law identically zero in-plane strain independent constants isotropic laminated anisotropic composite laminated composites consisting laminated plate lamination angle lamination parameters lb/in major Poisson's ratio material and geometric material parameters materials optimization measured mechanical properties netting analysis number of independent number of layers number of plies odd layers orthotropic orthotropic material Philco Corporation pressure vessels resin content shear modulus shown in Figure stiffness matrix stiffness ratio strain rosettes stress resultant structural behavior symmetric tensor theoretical predictions total number transverse stiffness Tsai unidirectional composite unidirectional fiber-reinforced composite unit ply values Young's modulus