Environmental Effects on the Isothermal and Thermomechanical Fatigue of SCS-6/TIMETAL 21S Unidirectional Composites PDF Download
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Author: T. Nicholas
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 15
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Book Description
The effect of environment on the fatigue behavior of SCS-6/TIMETAL 21S [0]4composites is examined through a comparison of fatigue lives and damage progression for tests performed in air and high-purity helium. Isothermal and thermomechanical tests were conducted at 650°C and 150 to 650°C, respectively. Out-of-phase thermomechanical fatigue (TMF) lives of specimens tested in the inert environment show a x2 increase in life. In-phase TMF lives in inert and air environments, which are governed primarily by fiber bundle strength and matrix stress relaxation, are comparable.
Author: T. Nicholas
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 15
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Book Description
The effect of environment on the fatigue behavior of SCS-6/TIMETAL 21S [0]4composites is examined through a comparison of fatigue lives and damage progression for tests performed in air and high-purity helium. Isothermal and thermomechanical tests were conducted at 650°C and 150 to 650°C, respectively. Out-of-phase thermomechanical fatigue (TMF) lives of specimens tested in the inert environment show a x2 increase in life. In-phase TMF lives in inert and air environments, which are governed primarily by fiber bundle strength and matrix stress relaxation, are comparable.
Author: Erian A. Armanios
Publisher: ASTM International
ISBN: 0803124112
Category : Composite materials
Languages : en
Pages : 570
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 20
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Book Description
Author: RW. Neu
Publisher:
ISBN:
Category : Elevated temperature
Languages : en
Pages : 23
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Book Description
Parameters and models to correlate the cycles to failure of a unidirectional metal matrix composite (SCS-6/Timetal 21S) undergoing thermal and mechanical loading are examined. Three different cycle types are considered: out-of-phase thermomechanical fatigue (TMF), in-phase TMF, and isothermal fatigue. A single parameter based on either the fiber or matrix behavior is shown not to correlate the cycles to failure of all the data. Two prediction methods are presented that assume that life may be dependent on at least two fatigue damage mechanisms and therefore consist of two terms. The first method, the linear life fraction model, shows that by using the response of the constituents, the life of these different cycle types are better correlated using two simple empirical relationships: one describing the fatigue damage in the matrix and the other fiber-dominated damage. The second method, the dominant damage model, is more complex but additionally brings in the effect of the environment. This latter method improves the predictions of the effects of the maximum temperature, temperature range, and frequency, especially under out-of-phase TMF and isothermal fatigue. The steady-state response of the constituents is determined using a 1-D micromechanics model with viscoplasticity. The residual stresses due to the CTE mismatch between the fiber and matrix during processing are included in the analysis.
Author: Michael G. Castelli
Publisher:
ISBN:
Category : Titanium compounds
Languages : en
Pages : 20
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Book Description
Author: Michael J. Verrilli
Publisher: ASTM International
ISBN: 080312001X
Category :
Languages : en
Pages : 382
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 24
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Author: Jeffrey Ronald Calcaterra
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 554
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Book Description
Author: Shankar Mall
Publisher: CRC Press
ISBN: 1000725472
Category : Technology & Engineering
Languages : en
Pages : 482
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Book Description
A review and summary of advancements related to mechanical behavior and related mechanics issues of titanium matrix composites (TMCs), a class of high-temperature materials useful in the propulsion and airframe components in advanced aerospace systems. After an introduction to TMCs, different authors review and summarise the advancements related to mechanical behavior and related mechanics issues of TMCs.
![Characterization of Damage Progression in SCS-6/TIMETAL 21S [0]4 Under Thermomechanical Fatigue Loading PDF](https://books.google.com/books/content/images/frontcover/g4F7zgEACAAJ?fife=w80-h100)
Author: MG. Castelli
Publisher:
ISBN:
Category : Coefficient of thermal expansion
Languages : en
Pages : 20
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Book Description
A detailed experimental investigation was performed at a single maximum cyclic stress (?max) level to physically characterize the progression of thermomechanical fatigue (TMF) damage in continuously reinforced [0°] SCS-6/TIMETAL 21S, a titanium matrix composite. In-phase (IP) and out-of-phase (OP) loadings were investigated at ?max = 1000 MPa with a temperature cycle from 150 to 650°C. Damage progression, in terms of macroscopic property degradation, was experimentally quantified through an advanced TMF test methodology that incorporates explicit measurements of the isothermal static moduli at the TMF temperature extremes and the coefficient of thermal expansion (CTE) as functions of the TMF cycles. Detailed characterization of the physical damage progression at the micro-structural level was performed by interrupting multiple TMF tests at various stages of mechanical property degradation and analyzing the microstructure through extensive destructive metallography. Further, the extent of damage was also quantified through residual static strength measurements. Results indicated that damage initiation occurred very early in cyclic life (N
