Life Prediction Methodology For Titanium Matrix Composites
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Life Prediction Methodology For Titanium Matrix Composites
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Author : W. Steven Johnson
language : en
Publisher: ASTM International
Release Date : 1996
Life Prediction Methodology For Titanium Matrix Composites written by W. Steven Johnson and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Metallic composites categories.
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
Modeling And Life Prediction Methodology For Titanium Matrix Composites Subjected To Mission Profiles
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Author : M. Mirdamadi
language : en
Publisher:
Release Date : 1994
Modeling And Life Prediction Methodology For Titanium Matrix Composites Subjected To Mission Profiles written by M. Mirdamadi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Modeling And Life Prediction Methodology For Titanium Matrix Composites Subjected To Mission Profiles
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Author : National Aeronautics and Space Adm Nasa
language : en
Publisher:
Release Date : 2018-10-20
Modeling And Life Prediction Methodology For Titanium Matrix Composites Subjected To Mission Profiles written by National Aeronautics and Space Adm Nasa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-20 with categories.
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...
A Comparison Of Life Prediction Methodologies For Titanium Matrix Composites Subjected To Thermomechanical Fatigue
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Author : Calcaterra, JR.
language : en
Publisher:
Release Date : 1997
A Comparison Of Life Prediction Methodologies For Titanium Matrix Composites Subjected To Thermomechanical Fatigue written by Calcaterra, JR. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Composite materials categories.
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 Life Prediction Of Titanium Matrix Composites Under Mission Spectrum Loading
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Author : T. Nicholas
language : en
Publisher:
Release Date : 1998
Fatigue Life Prediction Of Titanium Matrix Composites Under Mission Spectrum Loading written by T. Nicholas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Automotive medicine categories.
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.
Damage Accumulation And Life Prediction Of Titanium Matrix Composites Subjected To Elevated Temperatures
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Author : Ohchang Jin
language : en
Publisher:
Release Date : 1999
Damage Accumulation And Life Prediction Of Titanium Matrix Composites Subjected To Elevated Temperatures written by Ohchang Jin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Metallic composites categories.
Titanium Matrix Composites
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Author : Shankar Mall
language : en
Publisher: CRC Press
Release Date : 2020-01-29
Titanium Matrix Composites written by Shankar Mall and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-01-29 with Technology & Engineering categories.
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.
Advances In Fatigue Lifetime Predictive Techniques
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Author : Michael R. Mitchell
language : en
Publisher: ASTM International
Release Date : 1996
Advances In Fatigue Lifetime Predictive Techniques written by Michael R. Mitchell and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Fracture mechanics categories.
Composite Materials
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Author : Erian A. Armanios
language : en
Publisher: ASTM International
Release Date : 1997
Composite Materials written by Erian A. Armanios and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Composite materials categories.
A Methodology To Predict Damage Initiation Damage Growth And Residual Strength In Titanium Matrix Composites
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Author : JG. Bakuckas
language : en
Publisher:
Release Date : 1996
A Methodology To Predict Damage Initiation Damage Growth And Residual Strength In Titanium Matrix Composites written by JG. Bakuckas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Fiber breakage categories.
In this research, a methodology to predict damage initiation, damage growth, fatigue life, and residual strength in titanium matrix composites (TMC) is outlined. Emphasis was placed on micromechanics-based engineering approaches. Damage initiation was predicted using a local effective strain approach. A finite element analysis verified the prevailing assumptions made in the formulation of this model. Damage growth, namely, fiber-bridged matrix crack growth, was evaluated using a fiber bridging (FB) model that accounts for thermal residual stresses. This model combines continuum fracture mechanics and micromechanics analyses yielding stress-intensity factor solutions for fiber-bridged matrix cracks. In the FB model, fibers in the wake of the matrix crack are idealized as a closure pressure, and an unknown constant frictional shear stress is assumed to act along the debond length of the bridging fibers. This frictional shear stress was used as a curve-fitting parameter to the available experimental data. Figure life and post-fatigue residual strength were predicted based on the axial stress in the first intact 0° fiber calculated using the FB model and a three-dimensional finite element analysis.