Author: Richard E. Tressler
Publisher:
ISBN:
Category :
Languages : en
Pages : 197
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Book Description
The mechanical and chemical factors that contribute to time dependent strength changes have been investigated for a variety of non-oxide materials including silicon nitride, silicon carbide and siliconized silicon carbide. The flaw behavior in an as-machined and oxidized HIP'ed silicon nitride under static load was investigated at various stress intensities, times, and temperatures. Flaw origins were of the pore/cavity and iron-based inclusion type. There was no strength increase or degradation in as-machined and oxidized samples static loaded for ten hours at 1100 C in air below the threshold stress intensity. The threshold stress intensity for crack growth at 1100 C were determined to be 1.75 and 2.00 MPa.m1/2 for the as-machined and oxidized HIPSN, respectively. A strength decrease with increased applied stress was observed in as-machined specimens static loaded at 1200 C and 1300 C in air. This effect is due to the creation of a new flaw population with more severe flaws. Keywords: Silicon nitride, Silicon carbide, Oxidation, High temperature strength, Threshold stress intensity, Slow crack growth, Tensile creep behavior, Cavitation, Creep damage. (JES).
Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 248
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Book Description
Author: United States. Army Research Office
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 316
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Book Description
Vols. for 1977- consist of two parts: Chemistry, biological sciences, engineering sciences, metallurgy and materials science (issued in the spring); and Physics, electronics, mathematics, geosciences (issued in the fall).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 702
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Book Description
Author: United States. Army Research Office, Research Triangle Park, N.C.
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
Author:
Publisher:
ISBN:
Category : Ceramic-matrix composites
Languages : en
Pages : 400
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Book Description
Author: United States. Army Research Office
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 458
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 792
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Book Description
Author: Roy W. Rice
Publisher: CRC Press
ISBN: 9780203908471
Category : Technology & Engineering
Languages : en
Pages : 716
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Book Description
This book presents a comprehensive review, evaluation, and summary of the dependence of mechanical properties on grain and particle parameters of monolithic ceramics and ceramic composites. Emphasizing the critical link between fabrication and ceramic performance, the book covers the grain dependence of monolithic properties and the dependence of c
Author: Longbiao Li
Publisher: Springer Nature
ISBN: 9811532745
Category : Technology & Engineering
Languages : en
Pages : 373
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Book Description
This book investigates the time-dependent behavior of fiber-reinforced ceramic-matrix composites (CMCs) at elevated temperatures. The author combines the time-dependent damage mechanisms of interface and fiber oxidation and fracture with the micromechanical approach to establish the relationships between the first matrix cracking stress, matrix multiple cracking evolution, tensile strength, tensile stress-strain curves and tensile fatigue of fiber-reinforced CMCs and time. Then, using damage models of energy balance, the fracture mechanics approach, critical matrix strain energy criterion, Global Load Sharing criterion, and hysteresis loops he determines the first matrix cracking stress, interface debonded length, matrix cracking density, fibers failure probability, tensile strength, tensile stress-strain curves and fatigue hysteresis loops. Lastly, he predicts the time-dependent mechanical behavior of different fiber-reinforced CMCs, i.e., C/SiC and SiC/SiC, using the developed approaches, in order to reduce the failure risk during the operation of aero engines. The book is intended for undergraduate and graduate students who are interested in the mechanical behavior of CMCs, researchers investigating the damage evolution of CMCs at elevated temperatures, and designers responsible for hot-section CMC components in aero engines.
