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Reduction of Thermal‐Gradient‐Induced Stresses in Composites Using Mixed Fibers
Author(s) -
Parthasarathy Triplicane A.,
Keller Kristen A.,
Mah TaiIl,
Kerans Ronald J.,
Butner Steve
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00617.x
Subject(s) - composite material , materials science , composite number , fiber , thermal , gradation , fracture (geology) , shear (geology) , physics , meteorology , computer science , computer vision
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.