The Experts below are selected from a list of 132 Experts worldwide ranked by ideXlab platform
Liqiang Yuan - One of the best experts on this subject based on the ideXlab platform.
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Employing Load Coils for Multiple Loads of Resonant Wireless Power Transfer
IEEE Transactions on Power Electronics, 2015Co-Authors: Yiming Zhang, Zhengming Zhao, Kainan Chen, Liqiang YuanAbstract:The Load coils are employed for multiple Loads of resonant wireless power transfer in this paper. With the addition of the Load coil, this three-coil structure has easy access to transferring power to multiple Loads with the advantages of a compact structure and controllable power flow. Both single-Load transfer and multiple-Load transfer are modeled and analyzed by means of the circuit theory. The transfer quality factor and the Load matching factor are utilized in the analysis of efficiency. In the single-Load transfer, the Load matching condition is fully explored. Based on the single-Load transfer, the multiple-Load transfer is researched. The double-Load transfer, acting as an illustration, is studied with the unCoupled and Coupled Load coils. Equivalent reflected resistances are introduced to decouple the model of the double-Load transfer with Coupled Load coils mathematically. An experimental prototype is implemented to verify the aforementioned analysis. The experimental results agree with the theoretical calculations.
Paul Steinmann - One of the best experts on this subject based on the ideXlab platform.
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modelling the curing process in magneto sensitive polymers rate dependence and shrinkage
International Journal of Non-linear Mechanics, 2015Co-Authors: Mokarram Hossain, Prashant Saxena, Paul SteinmannAbstract:This paper deals with a phenomenologically motivated magneto-viscoelastic Coupled finite strain framework for simulating the curing process of polymers under the application of a Coupled magneto-mechanical Load. Magneto-sensitive polymers are prepared by mixing micron-sized ferromagnetic particles in uncured polymers. Application of a magnetic field during the curing process causes the particles to align and form chain-like structures lending an overall anisotropy to the material. The polymer curing is a viscoelastic complex process where a transformation from fluid to solid occurs in the course of time. During curing, volume shrinkage also occurs due to the packing of polymer chains by chemical reactions. Such reactions impart a continuous change of magneto-mechanical properties that can be modelled by an appropriate constitutive relation where the temporal evolution of material parameters is considered. To model the shrinkage during curing, a magnetic-induction-dependent approach is proposed which is based on a multiplicative decomposition of the deformation gradient into a mechanical and a magnetic-induction-dependent volume shrinkage part. The proposed model obeys the relevant laws of thermodynamics. Numerical examples, based on a generalised Mooney–Rivlin energy function, are presented to demonstrate the model capacity in the case of a magneto-viscoelastically Coupled Load.
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Modelling the mechanical aspects of the curing process of magneto-sensitive elastomeric materials
International Journal of Solids and Structures, 2015Co-Authors: Mokarram Hossain, Prashant Saxena, Paul SteinmannAbstract:In this paper, a phenomenologically motivated magneto-mechanically Coupled finite strain elastic framework for simulating the curing process of polymers in the presence of a magnetic Load is proposed. This approach is in line with previous works by Hossain and co-workers on finite strain curing modelling framework for the purely mechanical polymer curing (Hossain et al., 2009b). The proposed thermodynamically consistent approach is independent of any particular free energy function that may be used for the fully-cured magneto-sensitive polymer modelling, i.e. any phenomenological or micromechanical-inspired free energy can be inserted into the main modelling framework. For the fabrication of magneto-sensitive polymers, micron-size ferromagnetic particles are mixed with the liquid matrix material in the uncured stage. The particles align in a preferred direction with the application of a magnetic field during the curing process. The polymer curing process is a complex (visco) elastic process that transforms a fluid to a solid with time. Such transformation process is modelled by an appropriate constitutive relation which takes into account the temporal evolution of the material parameters appearing in a particular energy function. For demonstration in this work, a frequently used energy function is chosen, i.e. the classical Mooney–Rivlin free energy enhanced by coupling terms. Several representative numerical examples are demonstrated that prove the capability of our approach to correctly capture common features in polymers undergoing curing processes in the presence of a magneto-mechanical Coupled Load.
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A comprehensive characterization of the electro-mechanically Coupled properties of VHB 4910 polymer
Archive of Applied Mechanics, 2015Co-Authors: Mokarram Hossain, Paul SteinmannAbstract:An illustrative documentation of some standard experimental tests of electro-active VHB 4910 polymer under application of purely mechanical and electro-mechanically Coupled Loadings is presented. VHB 4910 is a very soft polymer that has potential applications as an electro-active polymer in the production of different types of actuators and sensors. The time-dependent viscoelastic phenomenon is ideal in polymers. Therefore, experiments with electro-mechanically Coupled Loads were conducted considering some standard tests that were usually used for a viscoelastic polymeric material characterization, i.e. Loading-unLoading tests, single-step relaxation tests, and multi-step relaxation tests. In all experimental cases, the polymer samples were pre-stretched up to several hundred per cent to make them thin enough initially so that the application of the electro-mechanically Coupled Load can show its effect to a larger extend. The pre-stretched samples were then subjected to various amounts of mechanical as well as Coupled deformations at different strain rates. The data produced from several Loading-unLoading tests, single-step relaxation tests, and multi-step relaxation tests show that the electric Loading has profound effect in the time-dependent behaviour of the electro-active VHB 4910 polymer. The data set either from single-step relaxation tests or multi-step relaxation tests can be used to identify electro-viscoelastic parameters for a suitable constitutive model that can capture electro-mechanically Coupled behaviours of VHB 4910. For validation, Loading-unLoading cyclic tests data can be utilized.
Yiming Zhang - One of the best experts on this subject based on the ideXlab platform.
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Employing Load Coils for Multiple Loads of Resonant Wireless Power Transfer
IEEE Transactions on Power Electronics, 2015Co-Authors: Yiming Zhang, Zhengming Zhao, Kainan Chen, Liqiang YuanAbstract:The Load coils are employed for multiple Loads of resonant wireless power transfer in this paper. With the addition of the Load coil, this three-coil structure has easy access to transferring power to multiple Loads with the advantages of a compact structure and controllable power flow. Both single-Load transfer and multiple-Load transfer are modeled and analyzed by means of the circuit theory. The transfer quality factor and the Load matching factor are utilized in the analysis of efficiency. In the single-Load transfer, the Load matching condition is fully explored. Based on the single-Load transfer, the multiple-Load transfer is researched. The double-Load transfer, acting as an illustration, is studied with the unCoupled and Coupled Load coils. Equivalent reflected resistances are introduced to decouple the model of the double-Load transfer with Coupled Load coils mathematically. An experimental prototype is implemented to verify the aforementioned analysis. The experimental results agree with the theoretical calculations.
Long Chen - One of the best experts on this subject based on the ideXlab platform.
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Mechanical response of hydronic asphalt pavement under temperature–vehicle Coupled Load: A finite element simulation and accelerated pavement testing study
Construction and Building Materials, 2021Co-Authors: Xingyi Zhu, Qifan Zhang, Long ChenAbstract:Abstract Hydronic asphalt pavement (HAP) is an environmentally friendly functional pavement. It has an energy-harvesting function and can emit energy to melt snow in winter. However, the mechanical response characteristics, especially under vehicle-temperature Coupled Load, and long-term performance of HAP systems remain under-investigated. Motivated by this absence of research, the mechanical response of HAP under vehicle–temperature Coupled Loading was analyzed using the finite element method. Results indicated that concrete between adjacent pipes bears large tensile stress. Mechanical damage, therefore, is likely to occur in those areas. The effects of parameters, like pipe spacing, embedded depth, inlet fluid temperature, and air temperature, on mechanical response were also studied to determine a more optimized pavement structure. The study conclusions can provide a theoretical basis for universal application and standardized design method of HAP. Furthermore, in-situ testing sections of the aforementioned optimized HAP structure were constructed and their rutting performance was evaluated using the one-third-scale model mobile Load simulator (MMLS3) to verify whether its long-term performance can meet the requirements for road durability. Results indicated that the average rutting depth of the HAP structure after 400,000 consecutive Loadings was less than 1 mm, which is significantly less than that of the control section without pipes. The pipes in HAP not only enable the conventional pavement to harvest energy and melt snow but also can enhance the rutting resistance performance of the pavement to a certain extent.
Fan Qin-man - One of the best experts on this subject based on the ideXlab platform.
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Analysis of Thermal Shock on the Failure of Thin-Walled Vessel under Thermo-solid Coupled Load
2008 International Conference on Intelligent Computation Technology and Automation (ICICTA), 2008Co-Authors: Fan Qin-man, Wu Yong-hai, Xu ChengAbstract:It is significant to study the structure safety of thin-walled vessel under thermo-solid Coupled Load. In allusion to a thin-walled vessel of failure receiving low-frequency and high-temperature thermal shock and pressure Load, direct coupling model, temperature-related material model and Finite Element Method (FEM) were applied to calculate the response of transient temperature field and transient stress field, based on which the influence of temperature Load on failure of the vessel was analyzed. It shows that the node temperature response of the vessel cross-section has obvious thermal-shock characteristics that high temperature of inner wall and large gradient of transient temperature appear; transient peak thermal stress caused by thermal shock is obviously higher than that caused by internal pressure, and the periodic Coupled stress plays an important role in the formation of cracks distributing around the placket of the vessel.
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Analysis of Thermal Shock on the Failure of Thin-Walled Vessel under Thermo-Solid Coupled Load
Heat Treatment of Metals, 2007Co-Authors: Fan Qin-manAbstract:In allusion to a thin-walled vessel of failure receiving low-frequency thermal shock and pressure Load, direct coupling model,temperature-related material model and Finite Element Method were applied to calculate the response of transient temperature field and transient stress field,based on which the influence of temperature Load on failure of the vessel was analyzed.It shows that the node temperature response of the vessel cross-section has obvious thermal-shock characteristics that high temperature of inner wall and large gradient of transient temperature appear; transient peak thermal stress caused by thermal shock is obviously higher than caused by internal pressure,and the periodic Coupled stress plays an important role in the formation of cracks distributing around the placket of the vessel.
