The Experts below are selected from a list of 120672 Experts worldwide ranked by ideXlab platform
Zbigniew Kolakowski - One of the best experts on this subject based on the ideXlab platform.
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semi analytical method versus the fem for analysis of the local post buckling of thin walled Composite Structures
Composite Structures, 2013Co-Authors: Zbigniew Kolakowski, Radoslaw J ManiaAbstract:Abstract The investigations are concerned with a comparison of the semi-analytical method (SAM) and the finite element method (FEM) applied to the local post-buckling analysis of thin-walled Composite Structures with closed cross-sections, in the second order approximation based on the linear analysis. A ‘lower bound’ approach by Koiter and Pignataro [6] improved in [9] , enables us to determine the overall flexural stiffness of an isotropic beam–column after its local buckling. The presented paper verifies the semi-analytical method and the FEM for thin-walled Composite Structures. The theoretical basis of the present approach is discussed and some typical examples are considered.
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load carrying capacity of thin walled Composite Structures
Composite Structures, 2005Co-Authors: Zbigniew Kolakowski, Tomasz KubiakAbstract:Abstract In the paper some basic ideas in approach to stability, post buckling behaviour and load carrying capacity of thin-walled Composite Structures are presented. Authors do not present equations that could only make the understanding of this issue “harder”. Thin walled Composite beam-coloumns with open and closed cross-section (channel and square cross-section) are calculated as an example. In order to analyse the stability and the structure performance after its loss, the ANSYS 5.7 package and authors' software has been used. Results obtained from both applied methods are compared. Presented examples show that the sole application of the FEM does not guarantee to obtain correct results of load carrying capacity and postbuckling path.
John Montesano - One of the best experts on this subject based on the ideXlab platform.
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modeling fatigue damage evolution in polymer matrix Composite Structures and validation using in situ digital image correlation
Composite Structures, 2015Co-Authors: Marina Selezneva, Martin Levesque, John Montesano, Zouheir FawazAbstract:A study is conducted with the aim of developing and implementing a fatigue prediction model for assessing the damage tolerance capabilities of polymer matrix Composite Structures. The damage mechanics based model uses empirical material parameters to represent orthotropic damage evolution. The model accounts for local multiaxial stresses as well as variable amplitude cyclic loading, which may result from local stress redistributions caused by damage evolution. The numerical results show the capability of the developed model to predict the variation of damage evolution and material property degradation in a triaxially braided carbon fiber polymer matrix component. The predictions are validated by independent experiments on Composite components using digital image correlation, which shows a strong correlation between the measured and predicted strain contours at various cyclic intervals. This is a key contribution and a step forward in developing a viable design tool for assessing the integrity and durability of Composite Structures.
Raymond M Measures - One of the best experts on this subject based on the ideXlab platform.
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Smart Composite Structures with embedded sensors
Composites Engineering, 1992Co-Authors: Raymond M MeasuresAbstract:Fiber-optic sensors embedded within advanced Composite materials represent a new branch of engineering with the potential to greatly enhance the confidence and use of these materials. An overview of our developments toward fiber-optic-based Smart Composite Structures is presented. This includes a review of our development of a full-scale fiber-optic damage assessment system for an aircraft Composite leading edge and the confirmation of the feasibility of such a resident fiber-optic structural integrity monitoring system. We report on the development and characterization of fiber-optic strain gauges that have been embedded within Composite materials and used to measure the internal strain field or detect load-induced acoustic emission from within Composite specimens, and explore the feasibility of undertaking optoacoustic cure monitoring. A discussion is also provided of two issues: fiber-optic strain sensitivity in light of the recent theoretical work of Sirkis and Haslach and thermally induced apparent strain. Lastly, mention is made of our passive, fast response, wavelength demodulation system for the Bragg grating sensor as this holds promise for the eventual development of a multiplexed, multisensing optoelectronic chip that could overcome the interconnect barrier to the practical implementation of Smart Structure technology. © 1992.
Zouheir Fawaz - One of the best experts on this subject based on the ideXlab platform.
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modeling fatigue damage evolution in polymer matrix Composite Structures and validation using in situ digital image correlation
Composite Structures, 2015Co-Authors: Marina Selezneva, Martin Levesque, John Montesano, Zouheir FawazAbstract:A study is conducted with the aim of developing and implementing a fatigue prediction model for assessing the damage tolerance capabilities of polymer matrix Composite Structures. The damage mechanics based model uses empirical material parameters to represent orthotropic damage evolution. The model accounts for local multiaxial stresses as well as variable amplitude cyclic loading, which may result from local stress redistributions caused by damage evolution. The numerical results show the capability of the developed model to predict the variation of damage evolution and material property degradation in a triaxially braided carbon fiber polymer matrix component. The predictions are validated by independent experiments on Composite components using digital image correlation, which shows a strong correlation between the measured and predicted strain contours at various cyclic intervals. This is a key contribution and a step forward in developing a viable design tool for assessing the integrity and durability of Composite Structures.
Tomasz Kubiak - One of the best experts on this subject based on the ideXlab platform.
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load carrying capacity of thin walled Composite Structures
Composite Structures, 2005Co-Authors: Zbigniew Kolakowski, Tomasz KubiakAbstract:Abstract In the paper some basic ideas in approach to stability, post buckling behaviour and load carrying capacity of thin-walled Composite Structures are presented. Authors do not present equations that could only make the understanding of this issue “harder”. Thin walled Composite beam-coloumns with open and closed cross-section (channel and square cross-section) are calculated as an example. In order to analyse the stability and the structure performance after its loss, the ANSYS 5.7 package and authors' software has been used. Results obtained from both applied methods are compared. Presented examples show that the sole application of the FEM does not guarantee to obtain correct results of load carrying capacity and postbuckling path.
