Introduction Introduction Composites respond to mechanical and hygrothermal loading in ways that are very different in metals. Due to their fibrous laminar non-isotropic structure, their extra modes of failure (usually due to the weak resin matrix) require special attention. Material allowables must consider the degrading effects of temperature, moisture, fabrication and service flaws and damage. Introduction Introduction 1

Static Structural Analysis of Composite Rotor Blades 2

Independent Parts of Blade Structure 3

Spar Dimensions 4

Close Approximations Using Shape Coefficients SKINS AREA OF SOLID MANDRELS AND CORES 5

SECOND MOMENT OF AREA FOR SOLID SHAPES 6

SECOND MOMENT OF AREA OF AIRFOIL-SHAPED SHELLS 7

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Two Cell Torsion Analysis 16

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