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Author: Michael J. Verrilli
Publisher: ASTM International
ISBN: 080312001X
Category :
Languages : en
Pages : 382
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Book Description
Author: Michael J. Verrilli
Publisher: ASTM International
ISBN: 080312001X
Category :
Languages : en
Pages : 382
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Book Description
Author: BS. Majumdar
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 14
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Book Description
An investigation was undertaken to characterize the deformation response of unidirectional SCS-6/Ti 15-3 metal matrix composite (MMC) lamina subjected to in-phase thermomechanical fatigue (TMF) loading. Evaluations were done in an inert atmosphere to avoid oxidation effects. It was found that the dominant effect on deformation was due to strain ratchetting. Distributed fiber cracking was found to be the primary damage mode in in-phase TMF. The early part of strain ratchetting was identified to be due to the viscoplastic response of the composite as fewer fiber cracks were found to develop at this stage in the MMC specimens. Early fiber cracks were found to occur near molybdenum (Mo) ribbon sites. The fiber-cracking process was determined to be progressive in nature. On qualitative grounds, the concept of fiber ineffective length and the zone of stress intensification at the neighboring fiber at temperature, as in the case of in-phase TMF, was consistent with the observation of progressive fiber cracking in the MMCs.
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: Huseyin Sehitoglu
Publisher: ASTM International
ISBN: 0803118716
Category : AIIoys
Languages : en
Pages : 259
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Book Description
Author: Gary R. Halford
Publisher:
ISBN:
Category : Metallic composites
Languages : en
Pages : 20
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Book Description
Author: J. Bressers
Publisher: Springer Science & Business Media
ISBN: 9401586365
Category : Technology & Engineering
Languages : en
Pages : 497
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Book Description
The International Symposium "Fatigue under Thermal and Mechanical Loading", held at Petten (The Netherlands) on May 22-24, 1995, was jointly organized by the Institute for Advanced Materials of The Joint Research Centre, E. C. , and by the Societe Fran~se de Metallurgie et de Materiaux. The fast heating and cooling cycles experienced by many high temperature components cause thermally induced stresses, which often operate in combination with mechanical loads. The resulting thermal / mechanical fatigue cycle leads to material degradation mechanisms and failure modes typical of service cycles. The growing awareness that the synergism between the combined thermal and mechanical loads can not be reproduced by means of isothermal tests, has resulted in an increasing interest in thermal and thermo-mechanical fatigue testing. This trend has been reinforced by the constant pull by industry for more performant, yet safer high temperature systems, pushing the materials to the limit of their properties. Dedicated ASTM meetings in particular have set the scene for this area of research. The proceedings of the symposium organized by D. A. Spera and D. F. Mowbray in 1975 provided a reference book on thermal fatigue which reflects the knowledge and experimental capabilities of the mid-seventies.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 38
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Book Description
Author: Golam M. Newaz
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
Author: Huseyin Sehitoglu
Publisher: ASTM International
ISBN: 0803128533
Category : Alloys
Languages : en
Pages : 339
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Book Description
Author: Shankar Mall
Publisher: CRC Press
ISBN: 1000717658
Category : Technology & Engineering
Languages : en
Pages : 478
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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.
