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Peter Wapperom - One of the best experts on this subject based on the ideXlab platform.
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Fiber Orientation evolution in simple shear flow from a repeatable initial Fiber Orientation
Journal of Non-Newtonian Fluid Mechanics, 2016Co-Authors: Mark J. Cieslinski, Peter Wapperom, Donald G. BairdAbstract:Abstract Experimental Fiber evolution data from a rheometer can be used to determine material parameters in Fiber Orientation models independent from processing flows. The Folgar–Tucker Orientation model was demonstrated in simple shear flow to predict distinctly different trends in the Orientation evolution depending on the initial Fiber Orientation. Repeatable Fiber Orientation evolution data in a simple shear flow was used to determine material parameters in the strain reduction factor (SRF) and reduced strain closure (RSC) Orientation models. The SRF and RSC Orientation models were tested with different initial Fiber Orientations created from an injection molded plaque in order to evaluate the Orientation model parameters. A stress equation incorporating Fiber-Fiber interactions was evaluated independently of the Fiber Orientation models using experimental Orientation evolution data with different initial Orientations.
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Obtaining repeatable initial Fiber Orientation for the transient rheology of Fiber suspensions in simple shear flow
Journal of Rheology, 2016Co-Authors: Mark J. Cieslinski, Donald G. Baird, Peter WapperomAbstract:Many researchers reporting the transient rheology of Fiber suspensions have not experimentally verified the initial Fiber Orientation. An assumption for the initial Orientation is then required to simulate the Fiber Orientation evolution and stress response. Measurements of Fiber Orientation obtained prior to testing in a rheometer can confirm the homogeneity of Fiber Orientation throughout a sample and repeatability between multiple samples. In this work, the transient rheology of glass Fiber suspensions above 0.5 mm in length was measured in a sliding plate rheometer with the initial Fiber Orientation generated through compression molding, flow reversal, and injection molding. Measurements of shear stress and Fiber Orientation were obtained to evaluate each sample preparation method and to gain insight into the stress-microstructure relationship. Preshearing and applying flow reversal was used in an effort to control the initial Fiber Orientation for transient shear stress measurements, but Fiber orient...
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Fiber Orientation kinetics of a concentrated short glass Fiber suspension in startup of simple shear flow
Journal of Non-newtonian Fluid Mechanics, 2010Co-Authors: Aaron P R Eberle, Donald G. Baird, Gregorio M Velezgarcia, Peter WapperomAbstract:Abstract The common approach for simulating the evolution of Fiber Orientation during flow in concentrated suspensions is to use an empirically modified form of Jeffery's equation referred to as the Folgar–Tucker (F-T) model. Direct measurements of Fiber Orientation were performed in the startup of shear flow for a 30 wt% short glass Fiber-filled polybutylene terephthalate (PBT-30); a matrix that behaves similar to a Newtonian fluid. Comparison between predictions based on the F-T model and the experimental Fiber Orientation show that the model over predicts the rate of Fiber reOrientation. Rheological measurements of the stress growth functions show that the stress overshoot phenomenon approaches a steady state at a similar strain as the Fiber microstructure, at roughly 50 units. However, Fiber Orientation measurements suggest that a steady state is not reached as the Fiber Orientation continues to slowly evolve, even up to 200 strain units. The addition of a “slip” parameter to the F-T model improved the model predictions of the Fiber Orientation and rheological stress growth functions.
Yiren Xu - One of the best experts on this subject based on the ideXlab platform.
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principal strain induced Fiber Orientation evolution in the csf mg composites with a large deformation
Journal of Composite Materials, 2015Co-Authors: Wenlong Tian, Jiming Zhou, Lehua Qi, Yiren XuAbstract:In this article, the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is investigated. The principal strain-induced Fiber Orientation evolution mechanism, which states that the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is determined by the principal strains, is proposed. The Fiber Orientation distribution factors Fi(i=1, 2and3) taking the form of the principal strains are proposed to quantitatively characterize the Fiber Orientation distribution in the Csf/Mg composites. The Fiber Orientation factors Fis predicted by the finite element simulation based on the principal strain-induced Fiber Orientation evolution mechanism are compared against those Fim measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results demonstrate that the principal strain-induced Fiber Orientation evolution mechanism is valid and convenient to predict the Fiber Orientation evolution in the Csf/Mg composites with a large deformation. ...
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Principal strain-induced Fiber Orientation evolution in the Csf/Mg composites with a large deformation
Journal of Composite Materials, 2014Co-Authors: Wenlong Tian, Jiming Zhou, Lehua Qi, Yiren XuAbstract:In this article, the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is investigated. The principal strain-induced Fiber Orientation evolution mechanism, which states that the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is determined by the principal strains, is proposed. The Fiber Orientation distribution factors Fi(i=1, 2and3) taking the form of the principal strains are proposed to quantitatively characterize the Fiber Orientation distribution in the Csf/Mg composites. The Fiber Orientation factors Fis predicted by the finite element simulation based on the principal strain-induced Fiber Orientation evolution mechanism are compared against those Fim measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results demonstrate that the principal strain-induced Fiber Orientation evolution mechanism is valid and convenient to predict the Fiber Orientation evolution in the Csf/Mg composites with a large deformation. ...
Wenlong Tian - One of the best experts on this subject based on the ideXlab platform.
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principal strain induced Fiber Orientation evolution in the csf mg composites with a large deformation
Journal of Composite Materials, 2015Co-Authors: Wenlong Tian, Jiming Zhou, Lehua Qi, Yiren XuAbstract:In this article, the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is investigated. The principal strain-induced Fiber Orientation evolution mechanism, which states that the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is determined by the principal strains, is proposed. The Fiber Orientation distribution factors Fi(i=1, 2and3) taking the form of the principal strains are proposed to quantitatively characterize the Fiber Orientation distribution in the Csf/Mg composites. The Fiber Orientation factors Fis predicted by the finite element simulation based on the principal strain-induced Fiber Orientation evolution mechanism are compared against those Fim measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results demonstrate that the principal strain-induced Fiber Orientation evolution mechanism is valid and convenient to predict the Fiber Orientation evolution in the Csf/Mg composites with a large deformation. ...
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Quantitative characterization of the Fiber Orientation variation in the Csf/Mg composites
Computational Materials Science, 2015Co-Authors: Wenlong Tian, Lehua Qi, Jiming ZhouAbstract:Based on the principal strain driven Fiber Orientation evolution mechanism, the Fiber Orientation variation factor V, which is a function of the principal strains, is proposed to quantitatively characterize the variation of Fiber Orientation angles in the extruded Csf/Mg composites. The FE analyses are implemented to numerically simulate the extrusion forming process of Csf/Mg composites. The Fiber Orientation variation factors predicted by the FE simulations are compared against those measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results show that the Fiber Orientation variation factor V of the FE simulations and of the extrusion experiments match well such that the Fiber Orientation variation factor V is valid and convenient to characterize the Fiber Orientation variation in the extruded Csf/Mg composites. The distribution of the Fiber Orientation variation factors illustrates that the Fibers in the extruded Csf/Mg composites are reoriented towards the direction of the maximum principal strain, and deviated from the directions of the medium and minimum principal strains.
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Quantitative characterization of the Fiber Orientation variation in the Csf/Mg composites
Computational Materials Science, 2015Co-Authors: Wenlong Tian, Lehua Qi, Jiming ZhouAbstract:Based on the principal strain driven Fiber Orientation evolution mechanism, the Fiber Orientation variation factor V, which is a function of the principal strains, is proposed to quantitatively characterize the variation of Fiber Orientation angles in the extruded Csf/Mg composites. The FE analyses are implemented to numerically simulate the extrusion forming process of Csf/Mg composites. The Fiber Orientation variation factors predicted by the FE simulations are compared against those measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results show that the Fiber Orientation variation factor V of the FE simulations and of the extrusion experiments match well such that the Fiber Orientation variation factor V is valid and convenient to characterize the Fiber Orientation variation in the extruded Csf/Mg composites. The distribution of the Fiber Orientation variation factors illustrates that the Fibers in the extruded Csf/Mg composites are reoriented towards the direction of the maximum principal strain, and deviated from the directions of the medium and minimum principal strains.
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Principal strain-induced Fiber Orientation evolution in the Csf/Mg composites with a large deformation
Journal of Composite Materials, 2014Co-Authors: Wenlong Tian, Jiming Zhou, Lehua Qi, Yiren XuAbstract:In this article, the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is investigated. The principal strain-induced Fiber Orientation evolution mechanism, which states that the Fiber Orientation evolution in the Csf/Mg composites with a large deformation is determined by the principal strains, is proposed. The Fiber Orientation distribution factors Fi(i=1, 2and3) taking the form of the principal strains are proposed to quantitatively characterize the Fiber Orientation distribution in the Csf/Mg composites. The Fiber Orientation factors Fis predicted by the finite element simulation based on the principal strain-induced Fiber Orientation evolution mechanism are compared against those Fim measured from the micrographs of the extrusion experiments of Csf/Mg composites. The results demonstrate that the principal strain-induced Fiber Orientation evolution mechanism is valid and convenient to predict the Fiber Orientation evolution in the Csf/Mg composites with a large deformation. ...
Donald G. Baird - One of the best experts on this subject based on the ideXlab platform.
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Fiber Orientation evolution in simple shear flow from a repeatable initial Fiber Orientation
Journal of Non-Newtonian Fluid Mechanics, 2016Co-Authors: Mark J. Cieslinski, Peter Wapperom, Donald G. BairdAbstract:Abstract Experimental Fiber evolution data from a rheometer can be used to determine material parameters in Fiber Orientation models independent from processing flows. The Folgar–Tucker Orientation model was demonstrated in simple shear flow to predict distinctly different trends in the Orientation evolution depending on the initial Fiber Orientation. Repeatable Fiber Orientation evolution data in a simple shear flow was used to determine material parameters in the strain reduction factor (SRF) and reduced strain closure (RSC) Orientation models. The SRF and RSC Orientation models were tested with different initial Fiber Orientations created from an injection molded plaque in order to evaluate the Orientation model parameters. A stress equation incorporating Fiber-Fiber interactions was evaluated independently of the Fiber Orientation models using experimental Orientation evolution data with different initial Orientations.
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Obtaining repeatable initial Fiber Orientation for the transient rheology of Fiber suspensions in simple shear flow
Journal of Rheology, 2016Co-Authors: Mark J. Cieslinski, Donald G. Baird, Peter WapperomAbstract:Many researchers reporting the transient rheology of Fiber suspensions have not experimentally verified the initial Fiber Orientation. An assumption for the initial Orientation is then required to simulate the Fiber Orientation evolution and stress response. Measurements of Fiber Orientation obtained prior to testing in a rheometer can confirm the homogeneity of Fiber Orientation throughout a sample and repeatability between multiple samples. In this work, the transient rheology of glass Fiber suspensions above 0.5 mm in length was measured in a sliding plate rheometer with the initial Fiber Orientation generated through compression molding, flow reversal, and injection molding. Measurements of shear stress and Fiber Orientation were obtained to evaluate each sample preparation method and to gain insight into the stress-microstructure relationship. Preshearing and applying flow reversal was used in an effort to control the initial Fiber Orientation for transient shear stress measurements, but Fiber orient...
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Fiber Orientation kinetics of a concentrated short glass Fiber suspension in startup of simple shear flow
Journal of Non-newtonian Fluid Mechanics, 2010Co-Authors: Aaron P R Eberle, Donald G. Baird, Gregorio M Velezgarcia, Peter WapperomAbstract:Abstract The common approach for simulating the evolution of Fiber Orientation during flow in concentrated suspensions is to use an empirically modified form of Jeffery's equation referred to as the Folgar–Tucker (F-T) model. Direct measurements of Fiber Orientation were performed in the startup of shear flow for a 30 wt% short glass Fiber-filled polybutylene terephthalate (PBT-30); a matrix that behaves similar to a Newtonian fluid. Comparison between predictions based on the F-T model and the experimental Fiber Orientation show that the model over predicts the rate of Fiber reOrientation. Rheological measurements of the stress growth functions show that the stress overshoot phenomenon approaches a steady state at a similar strain as the Fiber microstructure, at roughly 50 units. However, Fiber Orientation measurements suggest that a steady state is not reached as the Fiber Orientation continues to slowly evolve, even up to 200 strain units. The addition of a “slip” parameter to the F-T model improved the model predictions of the Fiber Orientation and rheological stress growth functions.
Shu Chien - One of the best experts on this subject based on the ideXlab platform.
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regulation of stretch induced jnk activation by stress Fiber Orientation
Cellular Signalling, 2006Co-Authors: Roland Kaunas, Shunichi Usami, Shu ChienAbstract:Cyclic mechanical stretch associated with pulsatile blood pressure can modulate cytoskeletal remodeling and intracellular signaling in vascular endothelial cells. The aim of this study was to evaluate the role of stretch-induced actin stress Fiber Orientation in intracellular signaling involving the activation of c-jun N-terminal kinase (JNK) in bovine aortic endothelial cells. A stretch device was designed with the capability of applying cyclic uniaxial and equibiaxial stretches to cultured endothelial cells, as well as changing the direction of cyclic uniaxial stretch. In response to 10% cyclic equibiaxial stretch, which did not result in stress Fiber Orientation, JNK activation was elevated for up to 6 h. In response to 10% cyclic uniaxial stretch, JNK activity was only transiently elevated, followed by a return to basal level as the actin stress Fibers became oriented perpendicular to the direction of stretch. After the stress Fibers had aligned perpendicularly and the JNK activity had subsided, a 90° change in the direction of cyclic uniaxial stretch reactivated JNK, and this activation again subsided as stress Fibers became re-oriented perpendicular to the new direction of stretch. Disrupting actin filaments with cytochalasin D blocked the stress Fiber Orientation in response to cyclic uniaxial stretch and it also caused the uniaxial stretch-induced JNK activation to become sustained. These results suggest that stress Fiber Orientation perpendicular to the direction of stretch provides a mechanism for both structural and biochemical adaptation to cyclic mechanical stretch.
