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A new analytical shear-lag based model for prediction of the steady state creep deformations of some short fiber composites
, Article Materials and Design ; Volume 30, Issue 4 , 2009 , Pages 1075-1084 ; 02641275 (ISSN) ; Abedian, A ; Ghavami, A ; Sharif University of Technology
2009
Abstract
A new analytical model based on the shear-lag theory is developed for stress analysis and prediction of the steady state creep deformation of short fiber composites subjected to an applied axial load. A perfect fiber/matrix interface is assumed and the steady state creep behavior of the matrix is described by an exponential law. The results obtained from the proposed analytical solution satisfy the equilibrium and constitutive creep equations. These analytical results are then validated by the FEM modeling. Interestingly, good agreements are found between the analytical and numerical predictions for all the stress and displacement rate components. © 2008 Elsevier Ltd. All rights reserved
An analytical model for prediction of the steady state creep deformations and stresses of short fiber composites
, Article 26th Congress of International Council of the Aeronautical Sciences 2008, ICAS 2008, Anchorage, AK, 14 September 2008 through 19 September 2008 ; Volume 2 , 2008 , Pages 2829-2840 ; 9781605607153 (ISBN) ; Abedian, A ; Ghavami, A ; Sharif University of Technology
2008
Abstract
A new analytical model based on the shear-lag theory is developed for stress analysis and steady state creep deformation of short fiber composites subjected to an applied axial load. A perfect fiber/matrix interface is assumed and an exponential law is considered for describing the steady state creep behavior of the matrix material. The matrix stress field components obtained from the proposed analytical solution satisfies the equilibrium and constitutive creep equations. Also, the obtained axial stress in the fiber in an average form satisfies the equilibrium requirements within the fiber and between the fiber and the matrix. Moreover, the above stress field components satisfy well the...
Investigation of interfacial and mechanical properties of alumina-coated steel fiber reinforced geopolymer composites
, Article Construction and Building Materials ; Volume 288 , 2021 ; 09500618 (ISSN) ; Nemati, A ; Khodabandeh, A. R ; Baghshahi, S ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
In this study, alumina coated steel reinforced geopolymer composites were successfully fabricated and their interfacial and mechanical properties were investigated. The fiber–matrix interface characteristics were assessed using single-fiber push-out and water contact angle experiments as well as SEM-EDS analysis. Finally, the role of alumina coating on the compressive, flexural and toughness of the geopolymer composites was investigated. The morphological studies revealed that alumina coating on steel can chemically bonded and microstructurally integrated with the surrounding matrix. The push-out test showed that the interfacial shear strength was increased approximately 150% in composites...
Progressive Flexural Fatigue Failure Analysis of Composites Through Layer Failure Determination
, Ph.D. Dissertation Sharif University of Technology ; Adibnazari, Saeed (Supervisor)
Abstract
Non-uniform damage growth of the composites under flexural fatigue loading condition makes it difficult to predict the fatigue behavior. In this thesis, A new modeling procedure is developed to introduce a progressive damage model. By using this model, it will be possible to define layer failure through its damage growth and layers constituents’ properties. On the other hand, an efficient micromechanics model must be utilized to relate the external loading to the constituents’ properties. Indeed the micromechanics model must be capable of including both constituent's properties and also fiber/matrix interface efficiency. For representing a complete description of the constituents’ properties...
Finite difference solution of steady state creep deformations in a short fiber composite in presence of fiber/matrix debonding
, Article Materials and Design ; Volume 31, Issue 5 , 2010 , Pages 2616-2624 ; 02641275 (ISSN) ; Abedian, A ; Mondali, M ; Sharif University of Technology
Abstract
A finite difference technique is developed to predict the second stage creep displacement rates and stress analysis of a short fiber metal matrix composite subjecting to a constant axial load through a micromechanical approach. The technique is capable to take into account the presence of interfacial debonding as one of the main factors affecting the creep performance of short fiber composites. The exponential law is adopted to describe the matrix creep behavior. Also, a model for prediction of interfacial debonding at fiber/matrix interface is developed using a stress based method. The obtained results could greatly help to better understand the flow pattern of matrix material and the load...