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Reduction of Thermal-Gradient-Induced Stresses in Composites Using Mixed Fibers

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The possibility of using fibers of varying thermal expansivities to reduce stresses generated from thermal gradients in service was explored. Laminates of aluminosilicate- and alumina-matrix composites were fabricated using a combination of Nextel 610™ and Nextel 720™ fibers. The composites were tested for mechanical behavior and thermomechanical behavior in comparison to control composite specimens which contained a single type of fiber. Mixed-fiber composites show strength and fracture behavior similar to those of single-fiber-type composites. Their thermomechanical behavior is consistent with 2D laminate models, making it possible to design composites using such models. Interlaminar shear stress is a key, but sole limitation and the use of gradation in fiber mixture is suggested.
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Keywords: composites; stress; thermal properties

Document Type: Research Article

Affiliations: 1: Air Force Research Laboratory, Materials and Manufacturing Directorate, AFRL/MLLN, Wright-Patterson Air Force Base, Ohio 45433-7817 2: Composite Optics, Inc., San Diego, California 92121

Publication date: April 1, 2004

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