Damage Evolution in Metal Matrix Composites Subjected to Thermomechanical Fatigue PDF Download
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Languages : en
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Languages : en
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Languages : en
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A thermomechanical analysis of a continuous fiber metal matrix composite (MMC) subjected to cyclic loading is performed herein. The analysis includes the effects of processing induced residual thermal stresses, matrix inelasticity, and interface cracking. Due to these complexities, the analysis is performed computationally using the finite element method. Matrix inelasticity is modelled with a rate dependent viscoplasticity model. Interface fracture is modelled by the use of a nonlinear interface constitutive model. The problem formulation is summarized, and results are given for a four-ply unidirectional SCS-6/[beta]21S titanium composite under high temperature isothermal mechanical fatigue. Results indicate rate dependent viscoplasticity can be a significant mechanism for dissipating the energy available for damage propagation, thus contributing to improved ductility of the composite. Results also indicate that the model may be useful for inclusion in life prediction methodologies for MMC's.
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Languages : en
Pages : 226
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The overall program consisted of two distinct phases with objectives: Phase I Objective: To characterize the evolution of isothermal fatigue damage using nondestructive evaluation techniques and correlate this information with residual strength of the composite. Phase II Objective: To characterize and compare the evolution of damage due to creep and TMF fatigue of metal matrix composites (SCS-6/TI-6A1-4V manufactured by Textron Specialty Materials) using nondestructive evaluation techniques and thereby derive an 'inefficiency factor' for damage accumulation under in-phase thermomechanical fatigue (IP-TMF). Phase I Results: The first phase of the program concluded that the usefulness of ultrasonic nondestructive evaluation to assess fatigue damage in a 06 Sigma-1240/Ti-6242 composites has been demonstrated through correlation of immersion and in situ ultrasonic data with residual tensile strength. Immersion surface wave scanning proved to be one of the most promising methods for correlating fatigue damage with the residual tensile strength for the composite used in this study. This study demonstrated that in situ nondestructive ultrasonic longitudinal wave and acoustic emission techniques can monitor the onset and accumulation of damage produced by either sustained loading or in-phased thermomechanical fatigue loading in a titanium matrix composite.
Author: Longbiao Li
Publisher: John Wiley & Sons
ISBN: 3527822607
Category : Technology & Engineering
Languages : en
Pages : 749
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Guides researchers and practitioners toward developing highly reliable ceramic-matrix composites The book systematically introduces the thermomechanical fatigue behavior of fiber-reinforced ceramic-matrix composites (CMCs) and environmental barrier coatings, including cyclic loading/unloading tensile behavior, cyclic fatigue behavior, dwell-fatigue behavior, thermomechanical fatigue behavior, and interface degradation behavior. It discusses experimental verification of CMCs and explains how to determine the thermomechanical properties. It also presents damage evolution models, lifetime prediction methods, and interface degradation rules. Thermomechanical Fatigue of Ceramic-Matrix Composites offers chapters covering unidirectional ceramic-matrix composites and cross-ply and 2D woven ceramic-matrix composites. For cyclic fatigue behavior of CMCs, it looks at the effects of fiber volume fraction, fatigue peak stress, fatigue stress ratio, matrix crack spacing, matrix crack mode, and woven structure on fatigue damage evolution. Both the Dwell-fatigue damage evolution and lifetime predictions models are introduced in the next chapter. Experimental comparisons of the cross-ply SiC/MAS composite, 2D SiC/SiC composite, and 2D NextelTM 720/Alumina composite are also included. Remaining sections examine: thermomechanical fatigue hysteresis loops; in-phase thermomechanical fatigue damage; out-of-phase thermomechanical fatigue; interface degradation models; and much more. -Offers unique content dedicated to thermomechanical fatigue behavior of ceramic-matrix composites (CMCs) and environmental barrier coatings -Features comprehensive data tables and experimental verifications -Covers a highly application-oriented subject?CMCs are being increasingly utilized in jet engines, industrial turbines, and exhaust systems Thermomechanical Fatigue of Ceramic-Matrix Composites is an excellent book for developers and users of CMCs, as well as organizations involved in evaluation and characterization of CMCs. It will appeal to materials scientists, construction engineers, process engineers, and mechanical engineers.
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.
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Languages : en
Pages :
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Author: David L. McDowell
Publisher: ASTM International
ISBN: 0803124732
Category : Composite materials
Languages : en
Pages : 238
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Contains papers from the May 1996 Symposium on Applications of Continuum Damage Mechanics (CDM) to Fatigue and Fracture. Papers in Section I deal with various aspects of modeling damage in composite materials, such as high temperature environmental degradation, fatigue, and viscous damage in metal a
Author: Di Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 346
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Author:
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Category :
Languages : en
Pages : 28
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Author: Michael J. Verrilli
Publisher: ASTM International
ISBN: 080312001X
Category :
Languages : en
Pages : 382
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