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Author: F. Mirzadeh
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 9
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Book Description
An analytical, inelastic micromechanical model, with temperature-dependent matrix properties, is employed to study metal matrix composite (MMC) laminates subjected to thermomechanical loading. The predictions are based on knowledge of the thermomechanical response of transversely isotropic, elastic graphite or silicon carbide fibers and elastic-viscoplastic, work-hardening, temperature-dependent titanium or aluminum matrix. The model is applied to predict initial yielding and thermomechanical response of silicon carbide/titanium and graphite/aluminum laminates. The results demonstrate the effect of cooling from a stress-free temperature and the mismatch of thermal and mechanical properties of the constituent phases on the laminate's subsequent mechanical response. Typical results are presented for [±45], laminates subjected to monotonic tension, cyclic tension/compression, biaxial tension, and thermal loadings. It is shown that inclusion of temperature-dependent properties has a significant influence on both the initial yield surface and the inelastic response of metal matrix composites. It is also shown that the degree of applied biaxial loading has a significant effect on the response of laminates.
Author: F. Mirzadeh
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 9
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Book Description
An analytical, inelastic micromechanical model, with temperature-dependent matrix properties, is employed to study metal matrix composite (MMC) laminates subjected to thermomechanical loading. The predictions are based on knowledge of the thermomechanical response of transversely isotropic, elastic graphite or silicon carbide fibers and elastic-viscoplastic, work-hardening, temperature-dependent titanium or aluminum matrix. The model is applied to predict initial yielding and thermomechanical response of silicon carbide/titanium and graphite/aluminum laminates. The results demonstrate the effect of cooling from a stress-free temperature and the mismatch of thermal and mechanical properties of the constituent phases on the laminate's subsequent mechanical response. Typical results are presented for [±45], laminates subjected to monotonic tension, cyclic tension/compression, biaxial tension, and thermal loadings. It is shown that inclusion of temperature-dependent properties has a significant influence on both the initial yield surface and the inelastic response of metal matrix composites. It is also shown that the degree of applied biaxial loading has a significant effect on the response of laminates.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 128
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Book Description
An analytical method is described for computing the nonlinear thermal and mechanical response of laminated plates. The material model focuses upon the behavior of metal matrix materials by relating the nonlinear composite response to plasticity effects in the matrix. The foundation of the analysis is the unidirectional material model which is used to compute the instantaneous properties of the lamina based upon the properties of the fibers and matrix. The unidirectional model assumes that the fibers properties are constant with temperature and assumes that the matrix can be modelled as a temperature dependent, bilinear, kinematically hardening material. An incremental approach is used to compute average stresses in the fibers and matrix caused by arbitrary mechanical and thermal loads. The layer model is incorporated in an incremental laminated plate theory to compute the nonlinear response of laminated metal matrix composites of general orientation and stacking sequence. The report includes comparisons of the method with other analytical approaches and compares theoretical calculations with measured experimental material behavior. A section is included which describes the limitations of the material model.
Author: David J. Barrett
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 128
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 59
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Book Description
This report describes the development of a theoretical model for the thermoplastic analysis of metal matrix fiber reinforced laminates. The nonlinear analysis is based on an incremental form of classical lamination theory in which the laminate can be loaded by residual stresses, thermal loads and edge stress resultants. The constituent stresses of the layers of the laminate are computed as the phase average stresses of the Composite Cylinder Assemblage. The matrix plasticity is treated by a transversely isotropic J2 theory with the exception that the response is found in an average sense since the onset of plastic flow (von Mises yield surface) and the flow itself (Prager's Rule) are based on the matrix phase average stresses. The hardening is temperature-dependent and kinematic. The mathematical model also accounts for the temperature dependency of the fiber and matrix material properties.
Author: Mahmood M. Shokrieh
Publisher: Woodhead Publishing
ISBN: 0128188189
Category : Technology & Engineering
Languages : en
Pages : 506
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Book Description
The residual stress is a common phenomenon in composite materials. They can either add to or significantly reduce material strength. Because of the increasing demand for high-strength, lightweight materials such as composites and their wide range of applications; it is critical that the residual stresses of composite materials are understood and measured correctly.The first edition of this book consists of thirteen chapters divided into two parts. The first part reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses. There are also additional chapters on using mathematical (analytical and numerical) methods for the calculation of residual stresses in composite materials. These include the simulated hole drilling method, the slitting/crack compliance method, measuring residual stresses in homogeneous and composite glass materials using photoelastic techniques, and modeling residual stresses in composite materials. The second part of the book discusses measuring residual stresses in different types of composites including polymer and metal matrix composites. The addition of nanoparticles to the matrix of polymeric composites as a new technique for the reduction of residual stresses is also discussed.In the Second Edition of this book, each of the original chapters of the first edition has been fully updated, taking into account the latest research and new developments. There are also five new chapters on the theoretical and experimental studies of residual stresses in the composite integrated circuits; residual stresses in additive manufacturing of polymers and polymer matrix composites; residual stresses in metal matrix composites fabricated by additive manufacturing; the eigenstrain based method for the incremental hole-drilling technique; and the estimation of residual stresses in polymer matrix composites using the digital image correlation technique.Residual Stresses in Composite Materials, Second Edition, provides a unique and comprehensive overview of this important topic and is an invaluable reference text for both academics and professionals working in the mechanical engineering, civil engineering, aerospace, automotive, marine, and sporting industries. - Presents the latest developments on theoretical and experimental studies of residual stresses in composites - Reviews destructive and non-destructive testing (NDT) techniques for measuring residual stresses - Discusses residual stresses in the polymer matrix, metal matrix, and ceramic matrix composites - Considers the addition of nanoparticles to the matrix as a new technique for reduction of residual stresses in polymeric composites - Introduces the latest advancements of research on the residual stresses in additive-manufactured polymer and metal matrix composites
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 384
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Book Description
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722939854
Category :
Languages : en
Pages : 166
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Book Description
This research investigates the response of a fiberless 13 layer hot isostatically pressed Ti-15-3 laminate to creep, constant strain rate, and cyclic constant strain rate loading at temperatures ranging from 482C to 649C. Creep stresses from 48 to 260 MPa and strain rates of .0001 to .01 m/m/sec were used. Material parameters for three unified constitutive models (Bodner-Partom, Miller, and Walker models) were determined for Ti-15-3 from the experimental data. Each of the three models was subsequently incorporated into a rule of mixtures and evaluated for accuracy and ease of use in predicting the thermoviscoplastic response of unidirectional metal matrix composite laminates (both 0 and 90). The laminates were comprised of a Ti-15-3 matrix with 29 volume percent SCS6 fibers. The predicted values were compared to experimentally determined creep and constant strain rate data. It was found that all three models predicted the viscoplastic response of the 0 specimens reasonably well, but seriously underestimated the viscoplastic response of the 90 specimens. It is believed that this discrepancy is due to compliant and/or weak fiber-matrix interphase. In general, it was found that of the three models studied, the Bodner-Partom model was easiest to implement, primarily because this model does not require the use of cyclic constant strain rate tests to determine the material parameters involved. However, the version of the Bodner-Partom model used in this study does not include back stress as an internal state variable, and hence may not be suitable for use with materials which exhibit a pronounced Baushinger effect. The back stress is accounted for in both the Walker and Miller models; determination of the material parameters associated with the Walker model was somewhat easier than in the Miller model. Rogacki, John R. and Tuttle, Mark E. Unspecified Center CREEP PROPERTIES; HIGH TEMPERATURE; HOT PRESSING; LAMINATES; METAL MATRIX COMPOSITES; STRAIN RATE; STRESS ANALYSIS; ...
Author: Rivka Gilat
Publisher: Springer Science & Business Media
ISBN: 9048134676
Category : Science
Languages : en
Pages : 329
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Book Description
This collection of cutting-edge papers, written by leading authors in honor of Professor Jacob Aboudi, covers a wide spectrum of topics in the field, presents both theoretical and experimental approaches, and suggests directions for possible future research.
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.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 692
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Book Description
