The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
Yiuwing Mai - One of the best experts on this subject based on the ideXlab platform.
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on the elastic modulus of hybrid particle Short Fiber polymer composites
Composites Part B-engineering, 2002Co-Authors: Yiuwing MaiAbstract:In this investigation, the elastic modulus of hybrid particle/Short-Fiber/polymer composites was studied using the rule of hybrid mixtures (RoHM) equation and the laminate analogy approach (LAA). In the RoHM, such a hybrid composite was treated as a hybrid system consisting of two separate single systems, namely particle/polymer system and Short-Fiber/polymer system. Thus, no interaction between particles and Short-Fibers could be considered. Then, the elastic modulus of the hybrid composite was evaluated from that of the two single systems using the RoHM. In the LAA, particle-filled polymer was regarded as an effective-matrix. The interaction between particles and Short-Fibers was incarnated in a manner that Short-Fibers were incorporated into the effective-matrix containing particles. The modulus of the Short-Fiber reinforced effective-matrix composite was then estimated using the LAA. In addition, the two approaches were applied to previous experimental results. It was interestingly observed that the predicted values by the LAA and the experimental results for the elastic modulus of hybrid particle/Short-Fiber/polymer composites were consistently higher than those predicted by the RoHM, suggesting that the modulus of hybrid particle/Short-Fiber/polymer composites shows a positive hybrid effect.
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On the elastic modulus of hybrid particle/Short-Fiber/polymer composites
Composites Part B: Engineering, 2002Co-Authors: Yiuwing MaiAbstract:In this investigation, the elastic modulus of hybrid particle/Short-Fiber/polymer composites was studied using the rule of hybrid mixtures (RoHM) equation and the laminate analogy approach (LAA). In the RoHM, such a hybrid composite was treated as a hybrid system consisting of two separate single systems, namely particle/polymer system and Short-Fiber/polymer system. Thus, no interaction between particles and Short-Fibers could be considered. Then, the elastic modulus of the hybrid composite was evaluated from that of the two single systems using the RoHM. In the LAA, particle-filled polymer was regarded as an effective-matrix. The interaction between particles and Short-Fibers was incarnated in a manner that Short-Fibers were incorporated into the effective-matrix containing particles. The modulus of the Short-Fiber reinforced effective-matrix composite was then estimated using the LAA. In addition, the two approaches were applied to previous experimental results. It was interestingly observed that the predicted values by the LAA and the experimental results for the elastic modulus of hybrid particle/Short-Fiber/polymer composites were consistently higher than those predicted by the RoHM, suggesting that the modulus of hybrid particle/Short-Fiber/polymer composites shows a positive hybrid effect.
K. Ono - One of the best experts on this subject based on the ideXlab platform.
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Piezoresistivity of a Short Fiber/elastomer matrix composite
Mechanics of Materials, 1998Co-Authors: Minoru Taya, W.j. Kim, K. OnoAbstract:Abstract If the electrical resistance of a material depends upon external straining, the material exhibits `piezoresistivity'. The piezoresistive behavior has been realized in an electrically conductive elastomer composite where the microstructure of conductive fillers can be changed under finite deformation of elastomer, resulting in the change of the composite resistivity. In this paper, we analyze the piezoresistive behavior of a conductive Short Fiber/elastomer matrix composite by applying a percolation model. Fiber reorientation model is applied to the composite system with the aim of predicting the relation between the applied finite strain and the reorientation of conductive Short Fibers. It is found that the piezoresistive behavior of a conductive Short Fiber/elastomer composite is attributed to the degeneration of initially percolating network under the finite strain. Some numerical results are then compared with our previous experimental data, showing a reasonably good agreement.
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piezoresistivity of a Short Fiber elastomer matrix composite
Mechanics of Materials, 1998Co-Authors: Minoru Taya, W.j. Kim, K. OnoAbstract:Abstract If the electrical resistance of a material depends upon external straining, the material exhibits `piezoresistivity'. The piezoresistive behavior has been realized in an electrically conductive elastomer composite where the microstructure of conductive fillers can be changed under finite deformation of elastomer, resulting in the change of the composite resistivity. In this paper, we analyze the piezoresistive behavior of a conductive Short Fiber/elastomer matrix composite by applying a percolation model. Fiber reorientation model is applied to the composite system with the aim of predicting the relation between the applied finite strain and the reorientation of conductive Short Fibers. It is found that the piezoresistive behavior of a conductive Short Fiber/elastomer composite is attributed to the degeneration of initially percolating network under the finite strain. Some numerical results are then compared with our previous experimental data, showing a reasonably good agreement.
Terry C. Lowe - One of the best experts on this subject based on the ideXlab platform.
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Influence of reinforcement morphology on the mechanical properties of Short-Fiber composites
1997Co-Authors: Yuntian Zhu, W.r. Blumenthal, M.g. Stout, James A. Valdez, N. Shi, M.l. Lovato, S.j. Zhou, Terry C. LoweAbstract:A major problem of Short-Fiber composites is that the interfaces between the Fiber and matrix become a limiting factor in improving mechanical properties such as strength. For a Short Fiber, a strong interface is desired to effectively transfer load from matrix to Fiber, thus reducing the ineffective Fiber length. However, a strong interface will make it difficult to relieve Fiber stress concentration in front of an approaching crack. Stress concentrations result in Fiber breakage. The authors report in this paper an innovative approach to overcome this problem: reinforcement morphology design. Short-Fibers with enlarged ends are processed and used to reinforce a polyester matrix. The initial results show that the bone-shaped Short-Fibers produce a composite with significantly higher strength than can be attained with conventional Short, straight Fibers.
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Modeling of statistical tensile strength tensile of Short-Fiber composites
1995Co-Authors: Y.t. Zhu, W.r. Blumenthal, M.g. Stout, Terry C. LoweAbstract:This Paper develops a statistical strength theory for three-dimensionally (3-D) oriented Short-Fiber reinforced composites. Short-Fiber composites are usually reinforced with glass and ceramic Short Fibers and whiskers. These reinforcements are brittle and display a range of strength values, which can be statistically characterized by a Weibull distribution. This statistical nature of Fiber strength needs to be taken into account in the prediction of composite strength. In this paper, the statistical nature of Fiber strength is incorporated into the calculation of direct Fiber strengthening, and a maximum-load composite failure criterion is adopted to calculate the composite strength. Other strengthening mechanisms such as residual thermal stress, matrix work hardening, and Short-Fiber dispersion hardening are also briefly discussed.
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Modeling of statistical tensile strength of Short-Fiber composites
1995Co-Authors: Yuntian Zhu, W.r. Blumenthal, M.g. Stout, Terry C. LoweAbstract:This paper develops a statistical strength theory for three-dimensionally (3-D) oriented Short-Fiber reinforced composites. Short-Fiber composites are usually reinforced with glass and ceramic Short Fibers and whiskers. These reinforcements are brittle and display a range of strength values, which can be statistically characterized by a Weibull distribution. This statistical nature of Fiber strength needs to be taken into account in the prediction of composite strength. In this paper, the statistical nature of Fiber strength is incorporated into the calculation of direct Fiber strengthening, and a maximum-load composite failure criterion is adopted to calculate the composite strength. Other strengthening mechanisms such as residual thermal stress, matrix work hardening, and Short-Fiber dispersion hardening are also briefly discussed.
Minoru Taya - One of the best experts on this subject based on the ideXlab platform.
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Piezoresistivity of a Short Fiber/elastomer matrix composite
Mechanics of Materials, 1998Co-Authors: Minoru Taya, W.j. Kim, K. OnoAbstract:Abstract If the electrical resistance of a material depends upon external straining, the material exhibits `piezoresistivity'. The piezoresistive behavior has been realized in an electrically conductive elastomer composite where the microstructure of conductive fillers can be changed under finite deformation of elastomer, resulting in the change of the composite resistivity. In this paper, we analyze the piezoresistive behavior of a conductive Short Fiber/elastomer matrix composite by applying a percolation model. Fiber reorientation model is applied to the composite system with the aim of predicting the relation between the applied finite strain and the reorientation of conductive Short Fibers. It is found that the piezoresistive behavior of a conductive Short Fiber/elastomer composite is attributed to the degeneration of initially percolating network under the finite strain. Some numerical results are then compared with our previous experimental data, showing a reasonably good agreement.
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piezoresistivity of a Short Fiber elastomer matrix composite
Mechanics of Materials, 1998Co-Authors: Minoru Taya, W.j. Kim, K. OnoAbstract:Abstract If the electrical resistance of a material depends upon external straining, the material exhibits `piezoresistivity'. The piezoresistive behavior has been realized in an electrically conductive elastomer composite where the microstructure of conductive fillers can be changed under finite deformation of elastomer, resulting in the change of the composite resistivity. In this paper, we analyze the piezoresistive behavior of a conductive Short Fiber/elastomer matrix composite by applying a percolation model. Fiber reorientation model is applied to the composite system with the aim of predicting the relation between the applied finite strain and the reorientation of conductive Short Fibers. It is found that the piezoresistive behavior of a conductive Short Fiber/elastomer composite is attributed to the degeneration of initially percolating network under the finite strain. Some numerical results are then compared with our previous experimental data, showing a reasonably good agreement.
Yuan-de Xue - One of the best experts on this subject based on the ideXlab platform.
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Stiffness prediction of Short Fiber reinforced composites
International Journal of Mechanical Sciences, 2019Co-Authors: Zheng-ming Huang, Chun-chun Zhang, Yuan-de XueAbstract:Abstract Stress fields in the Fiber and matrix of a transversely isotropic Short Fiber reinforced composite are obtained following an elasticity approach, and its axial modulus is derived. Extension of the bridging tensor in Bridging Model to the Short Fiber composite is made and analytical formulae for all of the four other moduli are determined. They are then used to predict the elastic modulus of a randomly arranged Short Fiber reinforced composite with any Fiber aspect ratio and any Fiber volume fraction. By assuming that every Fiber in a representative volume element of the composite has an equal possibility of orientation with respect to each global coordinate, the present model's predictions agree better with the available experiments than those obtained from Halpin–Tsai's formulae and finite element method. An iso-strain assemblage attains a higher accuracy than an iso-stress approach in general except for a case of very small Fiber aspect ratio, in which both iso-strain and iso-stress methods result in favorable predictions. The present work completes the Short board of Bridging Model for analyzing mechanical properties of Short Fiber or particle reinforced composites.
