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Shear in Flexure of Fiber Composites with Different End Supports

¹ Center for Biomaterials, MC-1615,
² Department of Orthodontics,
³ Department of Prosthodontics and Operative Dentistry, 1-4School of Dental Medicine,
University of Connecticut Health Center, Farmington, CT 06030;

*corresponding author, Goldberg{at}nso1.uchc.edu

The integrity of fiber-reinforced composite (FRC) prostheses is dependent, in part, on flexural rigidity. The object of this study was to determine if the flexure behavior of uniform FRC beams with restrained or simply supported ends and various length/depth (L/d) aspect ratios could be more accurately modeled by correcting for shear. Experimental results were compared with three analytical models. All models were accurate at high L/d ratios, but the shear-corrected model was accurate to the lowest, more clinically relevant, L/d values. In this range, more than 40% of the beam deflection was due to shear.

KEY WORDS: fiber-reinforced • composites • flexure • shear • restraints