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Title: Fracture mechanisms of the SCS-6 fiber-reinforced titanium alloy matrix composites

Abstract

Tensile, notched 3-point bending, low-cycle-fatigue and fatigue-crack-propagation tests were conducted at room temperature on the unidirectional SiC fiber-reinforced Ti-15V-3Cr-3Al-3Sn, Ti-6Al-4V and Ti-25Al-10Nb-3V-1Mo composites. Microstructural parameters controlling the deformation, damage initiation, and growth of the composites were investigated using metallographic technique and fractographic analysis. These parameters include interfacial reaction between fiber and matrix, interfacial mechanical properties, matrix toughness, fiber strength and loading conditions. The resulting deformation and fracture mechanisms of these composites under quasi-static and notched 3-point bend loading were classified on the basis of the ratio of the fiber strength ({delta}{sub f}) to interfacial shear strength ({tau}{sub i}) vs. matrix toughness. These failure mechanisms will provide a scientific basis for the development of an analytical model to predict the micro and macro-fracture processes of fiber-reinforced metal-matrix composites. Furthermore, the low-cycle-fatigue damage diagram was constructed using the maximum stress in the fiber vs. fatigue life.

Authors:
Publication Date:
Research Org.:
California Univ., Los Angeles, CA (United States)
OSTI Identifier:
7201555
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph.D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; FRACTURE PROPERTIES; MICROSTRUCTURE; CRACK PROPAGATION; FATIGUE; FIBERS; MATRIX MATERIALS; TITANIUM BASE ALLOYS; ALLOYS; CRYSTAL STRUCTURE; MATERIALS; MECHANICAL PROPERTIES; TITANIUM ALLOYS; 360603* - Materials- Properties; 360602 - Other Materials- Structure & Phase Studies

Citation Formats

Jeng, Shwangming. Fracture mechanisms of the SCS-6 fiber-reinforced titanium alloy matrix composites. United States: N. p., 1991. Web.
Jeng, Shwangming. Fracture mechanisms of the SCS-6 fiber-reinforced titanium alloy matrix composites. United States.
Jeng, Shwangming. 1991. "Fracture mechanisms of the SCS-6 fiber-reinforced titanium alloy matrix composites". United States.
@article{osti_7201555,
title = {Fracture mechanisms of the SCS-6 fiber-reinforced titanium alloy matrix composites},
author = {Jeng, Shwangming},
abstractNote = {Tensile, notched 3-point bending, low-cycle-fatigue and fatigue-crack-propagation tests were conducted at room temperature on the unidirectional SiC fiber-reinforced Ti-15V-3Cr-3Al-3Sn, Ti-6Al-4V and Ti-25Al-10Nb-3V-1Mo composites. Microstructural parameters controlling the deformation, damage initiation, and growth of the composites were investigated using metallographic technique and fractographic analysis. These parameters include interfacial reaction between fiber and matrix, interfacial mechanical properties, matrix toughness, fiber strength and loading conditions. The resulting deformation and fracture mechanisms of these composites under quasi-static and notched 3-point bend loading were classified on the basis of the ratio of the fiber strength ({delta}{sub f}) to interfacial shear strength ({tau}{sub i}) vs. matrix toughness. These failure mechanisms will provide a scientific basis for the development of an analytical model to predict the micro and macro-fracture processes of fiber-reinforced metal-matrix composites. Furthermore, the low-cycle-fatigue damage diagram was constructed using the maximum stress in the fiber vs. fatigue life.},
doi = {},
url = {https://www.osti.gov/biblio/7201555}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {1}
}

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