Stress calculations were carried out for a proposed fiber-reinforced composite thruster blade. The composite blade is constructed using multiple layers of braided fiber in a thick-shell skin layer; the core is filled with foam-type material and uses shear webs for internal support. The objective of this paper is to explore the rotating blade hydrodynamic design constraints of a typical composite blade by performing a 3-D finite element analysis. Two salient features are revealed from the numerical results: (1) maximum tip deflection of the composite blade can be quite large; (2) maximum through-the-thickness tensile stress in the skin layer thickness direction could become critical for higher loadings. It is demonstrated in the sample calculation that a sandwich-type composite blade can provide not only a means of weight-savings, but it also can have excellent structural stiffness and strength properties through proper geometric and material design.
Three-Dimensional Stress Analysis of a Fiber-Reinforced Composite Thruster Blade
Lin, Gau-Feng. "Three-Dimensional Stress Analysis of a Fiber-Reinforced Composite Thruster Blade." Paper presented at the SNAME 6th Propeller and Shafting Symposium, Virginia Beach, Virginia, USA, September 1991. doi: https://doi.org/10.5957/PSS-1991-09
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