Proposed Framework For Thermomechanical Fatigue Tmf Life Prediction Of Metal Matrix Composites Mmcs

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Proposed Framework for Thermomechanical Fatigue (TMF) Life Prediction of Metal Matrix Composites (MMCs)

Author : VK. Arya
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Proposed Framework for Thermomechanical Fatigue (TMF) Life Prediction of Metal Matrix Composites (MMCs) by : VK. Arya

Download or read book Proposed Framework for Thermomechanical Fatigue (TMF) Life Prediction of Metal Matrix Composites (MMCs) written by VK. Arya and published by . This book was released on 1993 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: The framework of a mechanics of materials model is proposed for thermomechanical fatigue (TMF) life prediction of unidirectional, continuous-fiber metal matrix composites (MMCs). Axially loaded MMC test samples are analyzed as structural components whose fatigue lives are governed by local stress-strain conditions resulting from combined interactions of the matrix, interfacial layer, and fiber constituents. The metallic matrix is identified as the vehicle for tracking fatigue crack initiation and propagation. The proposed framework has three major elements. First, TMF flow and failure characteristics of in situ matrix material are approximated from tests of unreinforced matrix material, and matrix TMF life prediction equations are numerically calibrated. The macrocrack initiation fatigue life of the matrix material is divided into microcrack initiation and microcrack propagation phases. Second, the influencing factors created by the presence of fibers and interfaces are analyzed, characterized, and documented in equation form. Some of the influences act on the microcrack initiation portion of the matrix fatigue life, others on the microcrack propagation life, while some affect both. Influencing factors include coefficient of thermal expansion mismatch strains, residual (mean) stresses, multiaxial stress states, off-axis fibers, internal stress concentrations, multiple initiation sites, nonuniform fiber spacing, fiber debonding, interfacial layers and cracking, fractured fibers, fiber deflections of crack fronts, fiber bridging of matrix cracks, and internal oxidation along internal interfaces. Equations exist for some, but not all, of the currently identified influencing factors. The third element is the inclusion of overriding influences such as maximum tensile strain limits of brittle fibers that could cause local fractures and ensuing catastrophic failure of surrounding matrix material. Some experimental data exist for assessing the veracity of the proposed framework.

Proposed Framework for Thermomechanical Life Modeling of Metal Matrix Composites

Author : Gary R. Halford
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Proposed Framework for Thermomechanical Life Modeling of Metal Matrix Composites by : Gary R. Halford

Download or read book Proposed Framework for Thermomechanical Life Modeling of Metal Matrix Composites written by Gary R. Halford and published by . This book was released on 1993 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Thermomechanical fatigue behavior of materials

Author : Michael J. Verrilli
Publisher : ASTM International
ISBN 13 : 080312001X
Total Pages : 382 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Thermomechanical fatigue behavior of materials by : Michael J. Verrilli

Download or read book Thermomechanical fatigue behavior of materials written by Michael J. Verrilli and published by ASTM International. This book was released on 1996 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Thermomechanical Fatigue Behavior of Materials

Author : Huseyin Sehitoglu
Publisher : ASTM International
ISBN 13 : 0803118716
Total Pages : 259 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Thermomechanical Fatigue Behavior of Materials by : Huseyin Sehitoglu

Download or read book Thermomechanical Fatigue Behavior of Materials written by Huseyin Sehitoglu and published by ASTM International. This book was released on 1993 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Life Prediction Methodology for Titanium Matrix Composites

Author : W. Steven Johnson
Publisher : ASTM International
ISBN 13 : 0803120397
Total Pages : 625 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Life Prediction Methodology for Titanium Matrix Composites by : W. Steven Johnson

Download or read book Life Prediction Methodology for Titanium Matrix Composites written by W. Steven Johnson and published by ASTM International. This book was released on 1996 with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the March 1994 symposium are organized into five sections that progress from basic understanding of mechanical damage mechanisms and environmental effects to life prediction methodology. Five papers discuss the interplay between interfacial strength, residual thermal stresses, an

Thermo-mechanical Fatigue Behavior of Materials

Author : Huseyin Sehitoglu
Publisher : ASTM International
ISBN 13 : 0803128533
Total Pages : 339 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Thermo-mechanical Fatigue Behavior of Materials by : Huseyin Sehitoglu

Download or read book Thermo-mechanical Fatigue Behavior of Materials written by Huseyin Sehitoglu and published by ASTM International. This book was released on 2000 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Methodologies for Predicting the Thermomechanical Fatigue Life of Unidirectional Metal Matrix Composites

Author : RW. Neu
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Methodologies for Predicting the Thermomechanical Fatigue Life of Unidirectional Metal Matrix Composites by : RW. Neu

Download or read book Methodologies for Predicting the Thermomechanical Fatigue Life of Unidirectional Metal Matrix Composites written by RW. Neu and published by . This book was released on 1996 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Titanium Matrix Composites

Author : Shankar Mall
Publisher : CRC Press
ISBN 13 : 1000725472
Total Pages : 482 pages
Book Rating : 4.0/5 (7 download)

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Book Synopsis Titanium Matrix Composites by : Shankar Mall

Download or read book Titanium Matrix Composites written by Shankar Mall and published by CRC Press. This book was released on 2020-01-29 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

A Comparison of Life Prediction Methodologies for Titanium Matrix Composites Subjected to Thermomechanical Fatigue

Author : Calcaterra, JR.
Publisher :
ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis A Comparison of Life Prediction Methodologies for Titanium Matrix Composites Subjected to Thermomechanical Fatigue by : Calcaterra, JR.

Download or read book A Comparison of Life Prediction Methodologies for Titanium Matrix Composites Subjected to Thermomechanical Fatigue written by Calcaterra, JR. and published by . This book was released on 1997 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several methodologies have been developed to predict the lives of titanium matrix composites (TMCs) subjected to thermomechanical fatigue (TMF). This paper reviews and compares five life prediction models developed at NASA-LaRC, Wright Laboratories, and Clarkson University. The models developed at NASA-LaRC and Clarkson University are based on a single parameter, the fiber stress in the load-carrying, or 0°, direction. The two other models, both developed at Wright Labs, are multi-parameter models. These can account for long-term damage, which is beyond the scope of the single-parameter models, but this benefit is offset by the additional complexity of the methodologies. Each of the methodologies was used to model data generated at NASA-LeRC, Wright Labs, and Georgia Tech for the SCS-6/Timetal 21-S material system. Viscoply, a micromechanical stress analysis code, was used to determine the constituent stress state for each test and was used for each model to maintain consistency. The predictive capabilities of the models are compared, and the ability of each model to accurately predict the responses of tests dominated by differing damage mechanisms is addressed.

Fatigue and Durability of Metals at High Temperatures

Author : S. S. Manson
Publisher : ASM International
ISBN 13 : 1615030549
Total Pages : 277 pages
Book Rating : 4.6/5 (15 download)

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Book Synopsis Fatigue and Durability of Metals at High Temperatures by : S. S. Manson

Download or read book Fatigue and Durability of Metals at High Temperatures written by S. S. Manson and published by ASM International. This book was released on 2009 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: From concept to application, this book describes the method of strain-range partitioning for analyzing time-dependent fatigue. Creep (time-dependent) deformation is first introduced for monotonic and cyclic loading. Multiple chapters then discuss strain-range partitioning in details for multi-axial loading conditions and how different loading permutations can lead to different micro-mechanistic effects. Notably, the total-strain method of strain-range partitioning (SRP) is described, which is a methodology that sees use in several industries. Examples from aerospace illustrate applications, and methods for predicting time-dependent metal fatigue are critiqued.

Fatigue Life Prediction of Titanium Matrix Composites Under Mission Spectrum Loading

Author : T. Nicholas
Publisher :
ISBN 13 :
Total Pages : 8 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Fatigue Life Prediction of Titanium Matrix Composites Under Mission Spectrum Loading by : T. Nicholas

Download or read book Fatigue Life Prediction of Titanium Matrix Composites Under Mission Spectrum Loading written by T. Nicholas and published by . This book was released on 1998 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue life predictions are conducted for a high temperature composite for hypersonic vehicle structural applications. A SCS-6/Timetal® 21S [0/90]s composite is evaluated under thermomechanical fatigue (TMF) as well as under typical hypersonic mission profiles and segments of those missions. The fatigue life analysis is based on micromechanical stresses which, in turn, are input into a damage summation model. Spectrum loading is decomposed into a series of in-phase and out-of-phase TMF segments whose lives are predicted from a life fraction model which was developed for isothermal and TMF data. Analytical predictions for the mission spectrum and the simple mission profiles are compared with experimental data obtained here as well as in a previous study. The model is demonstrated to be able to predict fatigue life under mission spectrum loading based solely on calibration under simple isothermal fatigue and TMF conditions.

Simulation of Fatigue Behavior of High Temperature Metal Matrix Composites

Author : CC. Chamis
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Simulation of Fatigue Behavior of High Temperature Metal Matrix Composites by : CC. Chamis

Download or read book Simulation of Fatigue Behavior of High Temperature Metal Matrix Composites written by CC. Chamis and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A generalized relatively new approach is described for the computational simulation of fatigue behavior of high temperature metal matrix composites (HT-MMCs). This theory is embedded in a specialty-purpose computer code. The effectiveness of the computer code to predict the fatigue behavior of HT-MMCs is demonstrated by applying it to a silicon-fiber/titanium-matrix HT-MMC. Comparative results are shown for mechanical fatigue, thermal fatigue, thermomechanical (in-phase and out-of-phase) fatigue, as well as the effects of oxidizing environments on fatigue life. These results show that the new approach reproduces available experimental data remarkably well.

Modeling and Life Prediction Methodology for Titanium Matrix Composites Subjected to Mission Profiles

Author : National Aeronautics and Space Adm Nasa
Publisher :
ISBN 13 : 9781729019078
Total Pages : 40 pages
Book Rating : 4.0/5 (19 download)

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Book Synopsis Modeling and Life Prediction Methodology for Titanium Matrix Composites Subjected to Mission Profiles by : National Aeronautics and Space Adm Nasa

Download or read book Modeling and Life Prediction Methodology for Titanium Matrix Composites Subjected to Mission Profiles written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-20 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Titanium matrix composites (TMC) are being evaluated as structural materials for elevated temperature applications in future generation hypersonic vehicles. In such applications, TMC components are subjected to complex thermomechanical loading profiles at various elevated temperatures. Therefore, thermomechanical fatigue (TMF) testing, using a simulated mission profile, is essential for evaluation and development of life prediction methodologies. The objective of the research presented in this paper was to evaluate the TMF response of the (0/90)2s SCS-6/Timetal-21S subjected to a generic hypersonic flight profile and its portions with a temperature ranging from -130 C to 816 C. It was found that the composite modulus, prior to rapid degradation, had consistent values for all the profiles tested. A micromechanics based analysis was used to predict the stress-strain response of the laminate and of the constituents in each ply during thermomechanical loading conditions by using only constituent properties as input. The fiber was modeled as elastic with transverse orthotropic and temperature dependent properties. The matrix was modeled using a thermoviscoplastic constitutive relation. In the analysis, the composite modulus degradation was assumed to result from matrix cracking and was modeled by reducing the matrix modulus. Fatigue lives of the composite subjected to the complex generic hypersonic flight profile were well correlated using the predicted stress in 0 degree fibers. Mirdamadi, M. and Johnson, W. S. Langley Research Center RTOP 505-63-50-04...

Advances in Fatigue Lifetime Predictive Techniques

Author : Michael R. Mitchell
Publisher : ASTM International
ISBN 13 : 080312029X
Total Pages : 354 pages
Book Rating : 4.8/5 (31 download)

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Book Synopsis Advances in Fatigue Lifetime Predictive Techniques by : Michael R. Mitchell

Download or read book Advances in Fatigue Lifetime Predictive Techniques written by Michael R. Mitchell and published by ASTM International. This book was released on 1996 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Micromechanics Analysis and Life Prediction of Titanium Matrix Composites

Author : T. Nicholas
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Micromechanics Analysis and Life Prediction of Titanium Matrix Composites by : T. Nicholas

Download or read book Micromechanics Analysis and Life Prediction of Titanium Matrix Composites written by T. Nicholas and published by . This book was released on 2006 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The response of a unidirectional SCS-6/Ti-6Al-4V composite is evaluated under a range of isothermal fatigue (IF) and thermomechanical fatigue (TMF) conditions. Both processing and thermomechanical test conditions are simulated using a cylinder in cylinder code, FIDEP, which treats the fiber as thermoelastic while the matrix is characterized using a recent version of the Bodner-Partom constitutive law. Computed stresses and strains in the constituents are obtained after 10 cycles of loading and are used as input into a new and simpler version of a life fraction model. Applied stress at temperature and computed matrix strains are used for the time-dependent and matrix fatigue terms in the model, respectively. Cyclic stress-strain behavior of the matrix material is also computed and used, together with fatigue life data, to identify the governing mechanisms and to explain the observed trends in fatigue life as a function of frequency and applied stress level. Comparisons of fatigue behavior with that of SCS-6/Timetal 21S illustrate differences when tested under nominally similar conditions.

Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites

Author : YA. Bahei-El-Din
Publisher :
ISBN 13 :
Total Pages : 17 pages
Book Rating : 4.:/5 (125 download)

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Book Synopsis Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites by : YA. Bahei-El-Din

Download or read book Analysis of Thermomechanical Fatigue of Unidirectional Titanium Metal Matrix Composites written by YA. Bahei-El-Din and published by . This book was released on 1993 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermomechanical fatigue (TMF) data have been generated for a Ti-15V-3Cr-3Al-3Sn (Ti-15-3) material reinforced with SCS-6 silicon carbide fibers for both in-phase and out-of-phase testing. Significant differences in failure mechanisms and fatigue life are noted for the in-phase and out-of-phase testing. The purpose of the research reported in this paper is to apply a micromechanics model to analysis of the data. The analysis predicts the stresses in the fiber and in the matrix material during the thermal and mechanical cycling by calculating both the thermal and mechanical stresses and their time-dependent behavior. The rate-dependent behavior of the matrix was characterized and was used to calculate the constituent stresses in the composite. The predicted 0° fiber stress range was used to explain the composite failure. It was found that for a given condition, temperature, loading frequency, and time at temperature, the 0° fiber stress range may control the fatigue life of the unidirectional composite.

The Engineering Index Annual

Author :
Publisher :
ISBN 13 :
Total Pages : 2264 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis The Engineering Index Annual by :

Download or read book The Engineering Index Annual written by and published by . This book was released on 1993 with total page 2264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.