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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Author: search.filters.author.Tsai, Jia-Lin

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Now showing 1 - 10 of 41
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    Performance Enhancement of A GaAs Solar Cell with Colloidal Quantum Dots Embedded in Trenches
    (2017-01-01)
    Shu, Chia-Jhe
    ;
    Huang, Yu-Ming
    ;
    Hsu, Shun-Chieh
    ;
    Shu, Jinn-Kong
    ;
    Tsai, Jia-Lin
    A hybrid colloidal quantum dot (CQD) single junction GaAs solar cell was fabricated and measured. The CQDs are cast into the different sizes of trenches on the device surface. The introduction of CQD layer brings wide-range EQE enhancement, particularly in the ultra-violet band. The analysis reveals possible luminescent down-shifting effect due to our embedded quantum dots. As high as 2 times of EQE enhancement can be observed at specific short wavelength.
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    Characterization of Young's modulus and thermal conductivity of graphene/epoxy nanocomposites
    (2019-03-01)
    Wang, Tai-Yuan
    ;
    Tseng, Po-Ying
    ;
    Tsai, Jia-Lin
    ;
    交大名義發表
    ;
    機械工程學系
    Atomistic simulation together with micromechanical analysis was employed to characterize the Young's modulus and thermal conductivity of graphene/epoxy nanocomposites. Nanocomposites containing pristine graphene, carboxyl (COOH)-functionalized graphene, and COOH- and amine (NH2)-functionalized graphene were considered in the simulations. The effect of atomistic interaction between the graphene and the surrounding epoxy was accounted for in the molecular dynamics simulations and then used to derive the effective properties of graphene. Subsequently, the Young's modulus and thermal conductivity of nanocomposites containing randomly oriented graphene were modeled using the Mori-Tanaka micromechanical model. The results indicated that the COOH- and NH2-functionalized graphene nanocomposite had superior mechanical and thermal properties to the other two material systems. Moreover, the model predictions were in favorable agreement with the experimental data.
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    Mechanical properties of nanocomposites with functionalized graphene
    (2016-11)
    Lee, Ming-Wei
    ;
    Wang, Tai-Yuan
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    The research investigated the thermal and mechanical properties of graphene/epoxy nanocomposites. Pristine graphene and functionalized graphene were used as nano-reinforcement in the nanocomposites. The graphene loadings employed in the nanocomposites were 0.1, 0.3, 0.5, and 1.0wt%. The functional groups grafted on the functionalized graphene were characterized through Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Results indicated that two kinds of functional groups are grafted on the functionalized graphene surfaces: one contains only COOH group and the other contains both COOH and NH2 groups. Moreover, from mechanical and thermal testing, it was found that the nanocomposites with functionalized graphene demonstrate better mechanical and thermal properties than those with pristine graphene. The graphene containing NH2 and COOH functional groups exhibits superior mechanical and thermal properties than the graphene with only COOH functional group. In addition, Young\'s modulus and thermal conductivity of the nanocomposites increase as the graphene loading increases. However, the fracture toughness and tensile strength of the nanocomposites attain peak values when the functionalized graphene loading is 0.1wt%. The effects of the functional groups on the mechanical and thermal properties of nanocomposites were elaborated using molecular dynamics (MD) simulation. It was revealed that the interfacial thermal conductance and normalized interaction energy increase between the functionalized graphene and epoxy matrix, which may be responsible for the enhanced mechanical properties in the functionalized graphene/epoxy nanocomposites.
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    Investigating thermal conductivities of functionalized graphene and graphene/epoxy nanocomposites
    (2016-09)
    Wang, Tai-Yuan
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    This research investigated the thermal conductivities of functionalized graphene (FG) and FG/epoxy nanocomposites by using molecular dynamics simulation. The functional groups considered in FG are carboxyl and amine groups. The results indicated that the thermal conductivity of FG is markedly reduced compared with that of pristine graphene. However, the FG/epoxy nanocomposites demonstrated higher thermal conductivity than did the pristine graphene nanocomposites. To understand the enhancement mechanism, the interfacial thermal conductance (ITC) between the FG and the surrounding epoxy matrix was examined. The effects of the FG on ITC were explicated using vibrational density of state and normalized interaction energy. The improvement of the thermal conductivity of FG/epoxy nanocomposites was attributable to the enhancement of the ITC resulting from the functional groups grafted on the graphene surface. In addition, establishing the functional groups facilitates atomistic interaction between the graphene and epoxy, which can reduce the phonon mismatch and enhance the thermal transport efficiency in the nanocomposite. The enhanced thermal conductivity in the FG/epoxy nanocomposites was validated by experimental observation. (C) 2016 Elsevier B.V. All rights reserved.
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    Characterizing the interfacial shear strength of graphite/epoxy composites containing functionalized graphene
    (2016-08-01)
    Lee, Ming-Wei
    ;
    Wang, Tai-Yuan
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    This study investigated the interfacial shear strength (IFSS) of graphite/epoxy composites containing functionalized graphene. Epoxy resin together with pristine graphene and functionalized graphene were employed as a matrix in the fiber composites, with graphene loadings in the epoxy matrix of 0.1, 0.3, and 0.5 wt%. The functional groups grafted on the functionalized graphene were characterized through Fourier transform infrared spectra and X-ray photoelectron spectroscopy. The IFSS of the fiber composites were evaluated through microdroplet testing, and the corresponding failure mechanism was examined using scanning electrical microscopy. The experimental results indicated that the IFSS increased with the graphene loadings in the matrix. Furthermore, both functionalized graphene and pristine graphene provided a similar IFSS in the fiber composites. Observation of the failure interface showed that the failure mechanism of the IFSS was dominated by interfacial failure between the fiber and matrix in conjunction with adhesive failure in the matrix. Introducing graphene in the matrix can enhance IFSS by improving the adhesive strength in the interface as well as complicating the crack extension in the matrix. (C) 2016 Elsevier Ltd. All rights reserved.
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    Characterizing mechanical behaviors of a flexible AMOLED during the debonding process
    (2016-10)
    Fu, Yun
    ;
    Tsai, Chen-Chu
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    The stress distribution of a flexible active-matrix organic light-emitting diode (AMOLED) display during the debonding process was investigated using finite element analysis. During the fabrication of an AMOLED display, an AMOLED with a polyimide (PI) substrate is detached from a glass carrier; this is a critical process and generally results in failure of the AMOLED. To enhance the yielding rate of AMOLEDs, their stress states generated during the debonding process must be reduced. The interfacial fracture behavior between the PI substrate and glass carrier was characterized on the basis of bimaterial fracture mechanics, and the fracture toughness associated with mode mixity determined through peeling tests was considered a criterion for detaching the AMOLED from the glass carrier. The stress distribution of the AMOLED at the inception of debonding crack extension was evaluated according to fracture toughness. In addition, the parameters possibly influencing the stress states of the AMOLED in the debonding process are discussed.
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    Micromechanical stick-slip model for characterizing damping responses of single-walled carbon nanotube nanocomposites
    (2016-01-01)
    Wang, Tai-Yuan
    ;
    Liu, Shou-Chi
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    A micromechanical stick-slip model was developed to characterize the damping response of single-walled carbon nanotube nanocomposites. Depending on the strength of the interfacial bonding and the extent of applied loading, the single-walled carbon nanotube embedded in the matrix may either completely stick to the matrix or partially slide relative to the matrix. The slippage in the interface, together with the contact friction, may lead to the energy dissipation of single-walled carbon nanotube nanocomposites. The effects of the aspect ratio of single-walled carbon nanotube, interfacial bonding strength, volume fraction of single-walled carbon nanotube, and interfacial friction on the damping behavior of single-walled carbon nanotube nanocomposites were accounted for in the micromechanical stick-slip model. In order to validate the analytical model, the energy dissipation was also evaluated using the finite element method. A cylindrical finite element method, with an embedded single-walled carbon nanotube, was developed where the stick-slip behavior of the interface between the single-walled carbon nanotube and surrounding matrix was characterized using a contact element. It was found that the energy dissipation obtained from the finite element analysis agrees with that derived from the micromechanical stick-slip model. Moreover, the energy dissipation may significantly increase, when the single-walled carbon nanotube slippage takes place. The increment of the energy dissipation could be attributed to the interfacial contact friction between the single-walled carbon nanotube and the surround matrix as well as the viscoelastic properties of the matrix materials.
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    Characterizing failure behaviors of debonded composite sandwich structures under compressive loading
    (2015-09-01)
    Nieh, Yi-Hsin
    ;
    Lai, Yen-Kun
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    This research investigated the failure behaviors of the composite sandwich structures with face sheet and core debond subjected to compressive loading. Experiments and numerical simulations were conducted to determine the effects of the face sheet thickness and debond length on the compressive strength and failure mechanisms of the composite sandwich structures. Experimental results revealed that sandwich structures with either thicker face sheets or a shorter debond length exhibited a higher buckling load and greater failure strength. Moreover, when the debond length was short, failure was primarily caused by global buckling; conversely, when the debond length was long, failure was caused by local buckling and crack extension from the debond edge. To characterize the failure mechanism, a nonlinear finite element simulation of sandwich specimens containing imperfections was conducted. The simulation revealed that, when the dominant failure mode was global buckling, failure occurred at the intermediate portion of the foam core and strength could be characterized using the maximum principal strain criterion. However, when the failure mode was local buckling, failure was initiated at the debond tip, and strength could be predicted using the damage zone method.
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    Characterizing the Stress Intensity Factor of Graphene Sheet with Central Crack
    (2015-05-01)
    Tsai, Jia-Lin
    ;
    Sie, Meng-Jhe
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    This paper aims to characterize the stress intensity factor (SIF) of atomistic graphene sheet with central crack subjected to uniaxial loading. The equilibrium configuration of the defective graphene sheet with missing covalent bonds was generated through molecular dynamics (MD) simulation. Subsequently, the local stress distribution near the crack tip of atomistic structure was evaluated using the Hardy stress formulation as well as the non-local elasticity theory. Based on the local stress distributions, the SIF of the atomistic graphene sheet was determined through the projection process. In comparison, the graphene sheet was also treated as a continuum solid, and the stress distribution near the crack tip as well as the SIF were evaluated from the finite element method (FEM). In an attempt to understand the crack size effect, the crack length was assumed to vary from 3 lattice distance to around 80 lattice distance. Results revealed that the SIF calculated based on the nonlocal elasticity theory in conjunction with the projection process is quite sensitive to the selection of the projection point. However, for the Hardy stress distribution, when the projection position is 1 lattice distance away from the crack tip, the SIF is quite consistent and the result is compatible to that obtained from the FEM analysis. Moreover, the agreement is better as the crack size is increasing. Therefore, the SIF calculated based on the Hardy stress formulation together with the projection approach could be a physical quantity correlating the defective atomistic graphene sheet with its continuum counterpart.
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    Characterizing vibration damping response of composite laminates containing silica nanoparticles and rubber particles
    (2015-03-01)
    Huang, Chien-Yang
    ;
    Tsai, Jia-Lin
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    This research aims to characterize the damping properties of fiber/epoxy composites containing different degrees of silica nanoparticles and rubber particles. Conventionally, adding rubber particles into fiber/epoxy composites would lead to dramatic reduction of stiffness although the vibration damping could be improved accordingly. In order to enhance the damping properties of the fiber composites without sacrificing the stiffness, silica nanoparticles together with rubber particles were introduced into the epoxy resin through the sonication process. The epoxy resin was then treated as matrix and impregnated into the fiber layer by means of the vacuum hand lay-up process to form the composite laminates. The vibration damping as well as the flexural stiffness of the fiber composite was measured using the forced vibration technique together with the half-power method. In addition, the vibration damping of the composite laminates, consisting of silica nanoparticles and rubber particles, was characterized using the micromechanical analysis. The repeated unit cell with the fibers displaying randomly in the matrix was employed to represent the microstructures of the unidirectional composites. The loss factor as well as the moduli obtained from the micromechanical analysis were regarded as the effective properties homogenizing within the fiber composites. In conjunction with the modal shapes, the vibration damping of the composite laminates with stacking sequence of [0](10), [90](10), [+/- 45](2s), and [90/0](2s) was calculated using the finite element analysis. Experimental results indicated that with the incorporation of the silica nanoparticles together with the rubber particles, the reduction of flexural stiffness of fiber composites, especially for the [90](10) laminates, was diminished while the damping properties of laminates were improved. Moreover, it was found that the effect of the particles in the [0](10) laminates is relatively minimal. The vibration damping responses of composites laminates obtained using the micromechanical analysis together with the modal analysis exhibit an agreement with the experimental data.