High-temperature Mechanical and Thermochemical Responses of Oxide-fluoromica Laminates with Application to Fiber-reinforced Ceramic Composites PDF Download
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Author: Todd T. King
Publisher:
ISBN:
Category :
Languages : en
Pages : 350
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Author: Todd T. King
Publisher:
ISBN:
Category :
Languages : en
Pages : 350
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Author: Shanti Nair
Publisher: Butterworth-Heinemann
ISBN:
Category : Science
Languages : en
Pages : 576
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Book Description
Introduction; Interfaces; Residual stresses; Fibre properties; Matrix cracking in unidirectional materials; Matrix cracking in 2-D materials; Stress redistribution; Fatigue, creep, challenges and opportunities.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 860
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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 872
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Author: Ellice Yeng Luh
Publisher:
ISBN:
Category :
Languages : en
Pages : 76
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Author: Donald R. Messier
Publisher:
ISBN:
Category : Ceramic fibers
Languages : en
Pages : 40
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Author: Matthew P. Appleby
Publisher:
ISBN:
Category : Ceramic-matrix composites
Languages : en
Pages : 206
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Novel high-temperature experiments were conducted in ordered to address some of the most critical life-limiting issues facing woven melt-infiltrated, silicon carbide (SiC) fiber-reinforced SiC ceramic matrix composites (CMCs) as well as protective thermal and environmental barrier coatings (T/EBC). Heating of specimens was achieved using laser-based approaches that simulate the high heat-flux thermal gradient environments that these materials will be subjected to in service. Specialized non-destructive evaluation (NDE) and inspection techniques were developed to investigate damage modes and material response. First, in order to examine the capabilities of utilizing the emerging technique of electrical resistance (ER) measurement for use in high temperature mechanical testing in SiC/SiC CMCs, the temperature dependent ER response of several systems was determined. A model was developed to establish the contribution to overall ER from the individual composite constituents and applied thermal gradient. Then, elevated temperature tensile tests were performed to characterize the damage of composite materials to localized stress concentrations. Further experiments were done to assess the differences in damage mechanisms and retained tensile strength properties of uncoated SiC/SiC CMCs and EBC-CMC systems after prolonged exposure to high pressure, high velocity water vapor containing environments. Differences in damage modes were described using ER monitoring and post-test inspection. Localized strain fields were measured using a novel digital image correlation (DIC) technique and stress-dependent matrix crack accumulation was monitored using in-situ modal acoustic emission (AE). Coupled AE and thermography measurements were also used to describe failure of protective ceramic coatings due to the life-limiting case of thermal cyclic loading. Due to the complex nature of T/EBC failure, the decrease in coating life and durability due to thermal stress concentrations and degradation via molten calcium-magnesium-aluminosilicate (CMAS) infiltration was also examined. Finally, the use of ER measurements for damage characterization was extended to the complex case of creep and stress-rupture of damaged and undamaged composites as well as the dramatic increase in stress-rupture life to SiC/SiC CMCs from environmental barrier coatings. Post-test microscopy was performed to further explain differences in material response and damage morphology.
Author: J. Forna-Kreutzer
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 201
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Author: Zhaoju Yu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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