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Transient analysis of layered beams subjected to steady heat supply and mechanical load
Zhong Zhang,Ding Zhou,Jiandong Zhang,Hai Fang,Huixuan Han 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.1
In this study, an analytical model is developed for the analysis of transient temperature, displacements, and stresses in simply supported layered beams. The beam is suddenly heated from the top and bottom surfaces by external steady heat sources and is subjected to a mechanical load. The temperature in each layer is variable along the thickness and follows the one-dimensional (1-D) transient heat transfer equation. The Laplace transform approach is used to obtain the transient temperature field in the beam. The thermoelastic constants of the beam are temperature-dependent. Dividing every layer into a series of thin slices, the temperature and the thermoelastic constants for each slice can be considered uniform. The two-dimensional (2-D) thermoelasticity theory is adopted to derive the governing equations of displacements and stresses in each slice. The transfer matrix method is applied to obtain the displacement and stress solutions for the beam. As an example, the distributions of transient temperature, displacements, and stresses in a three-layer beam are studied. The effects of the temperature dependent thermoelastic constants on the mechanical behavior of the beam are discussed in detail.
Ye Zhang,Yan Zhao,Hongwei Pan,Xianzhong Lang,Huili Yang,Huiliang Zhang,Huixuan Zhang,Lisong Dong 한국고분자학회 2016 폴리머 Vol.40 No.3
Polylactide (PLA) was plasticized with poly(diethylene glycol adipate) (PDEGA). The plasticized PLA was further blended with core-shell structured particles of glycidyl methacrylate-functionalized methyl methacrylate-butyl acrylate copolymer (GACR) using a twin-screw extruder, and the extruded samples were blown using the blown thin film technique. Both PDEGA and GACR significantly influenced the physical properties of the films. Compared to neat PLA, the elongation at break and tear strength of the films were significantly improved. The shear yielding induced by cavitation of GACR particles was the major tearing mechanism. GACR could act as a tear resistance modifier for PLA blown films. The spherulite size of the PLA/PDEGA/GACR films decreased with the addition of GACR. The biodegradability of the PLA/PDEGA/GACR films decreased slightly. These findings contributed new knowledge to the additive area and gave important implications for designing and manufacturing polymer packaging materials.
Qiuling Ma,Huixuan Zhang,Yuqi Cui,Xiaoyong Deng,Ruonan Guo,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
Cu2O decorated TiO2 nano-tube arrays (Cu2O/TiO2 NTAs) photoelectrode was fabricated throughelectrodeposition strategy. Meanwhile, physicochemical properties of the resulting photoelectrode weresystematically studied by series of measurements. Results indicated that Cu2O/TiO2 NTAs photoelectrodeperformed a significantly enhanced light absorbance in the visible region between 400 and 800 nm,transient photocurrent density of 0.162 mA Cm 2, photogenerated charge separation efficiency and 99.9%of photoelectrocatalytic efficiency for decomposition of 2,4,6-trichlorophenol within 120 min Xenonillumination with the help of +1.0 V (vs. SCE) potential. Furthermore, the enhanced visible lightresponsible photoelectrocatalytic mechanism was proposed and discussed.
Yu Fan,Hailong Zhang,Guangfeng Wu,Huixuan Zhang 한국고분자학회 2015 폴리머 Vol.39 No.6
Core-shell structured grafted copolymer particles of butyl acrylate (BA) grafted methyl methacrylate (MMA) and styrene (St) monomers (ACR-g-St) were prepared by seed emulsion polymerization. Poly(vinyl chloride) (PVC)/ACR-g-St blends were proposed. The fusion properties, dynamic mechanical behavior, rheological behavior, mechanical properties and morphology of blends were characterized by a torque rheometer, dynamic mechanical analyzer (DMA), rotational rheometer, universal mechanical testing machine and scanning electron microscope (SEM). The results showed that the ACR-g-St particles accelerated the fusion of PVC resins, but the equilibrium torque increased slightly. The storage modulus (G′), loss modulus (G″) and complex viscosity (η<SUP>*</SUP>) of melts exhibited a monotonic changing with frequency and all had minimum values when ACR-g-St content was 16 phr. The tensile and impact strength were highest at 8 phr content of ACR-g-St. ACR-g-St not only can be used as an efficient impact aid but also plays a role of lubricant, which is helpful for PVC processing.
Properties of Poly(vinyl chloride)/PB-g-PMMA Composites
Guangfeng Wu,Hailong Zhang,Huixuan Zhang 한국고분자학회 2015 폴리머 Vol.39 No.5
To improve the mechanical properties of poly(vinyl chloride) (PVC), the characters of combining PVC with elastomers were considered. Polybutadiene grafted poly(methyl methacrylate) (PB-g-PMMA, MB) core-shell particles were prepared by emulsion polymerization, and were used as an impact modifier for PVC. The impact resistance, fracture, brittle-ductile transition and the morphology of PVC/MB blends were investigated. It was found that MB particles had a high toughening efficiency for PVC resin, the impact strength was more than 1100 J·m-1 when MB was 8 phr. Two factors influence the impact strength and brittle-ductile transition, one is the modifier content, and the other is core-shell weight ratio. The impact curves are Ω-like shape, the impact strength value is the highest at the middle part and the PVC/ MB blends show ductile break behaviors. The core shell ratio of ductile areas are limited from 80/20 to 90/10 for PVC/MB=100/8, and 70/30 to 93/7 for PVC/MB=100/10.
Jianfeng Gou,Xiaohui Li,Huixuan Zhang,Ruonan Guo,Xiaoyong Deng,Xiuwen Cheng,Mingzheng Xie,Qingfeng Cheng 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-
Silver/silver chloride/exfoliated graphite (Ag/AgCl/EG) nano-photocatalyst was synthesized through precipitation and photoreduction processes. Afterwards, physicochemical properties of Ag/AgCl/EG were systematically studied by series of techniques. Results indicated that spherical-like Ag0 and AgCl with a diameter of 18.6 nm were deposited onto the surface of EG, resulting in the large surface area, strong visible absorbance and high charge separation efficiency. In addition, Ag/AgCl/EG exhibited high visible light photocatalytic (PC) activity for degradation of RhB (99.5%) and phenol (89.1%) solution. Also, the enhanced visible light PC mechanism was proposed and confirmed. Furthermore, Ag/AgCl/EG nano-photocatalyst performed good reusability even after six recycles utilization.
Shixin Song,Hanxiao Lv,Yuanjing Bi,Shulin Sun,HuiXuan Zhang 한국고분자학회 2017 Macromolecular Research Vol.25 No.5
Colloid silica nanoparticles were hydrophobic modified by γ-methacryloxypropyl trimethoxysilane (MPS) for the encapsulation into polymer. The alkoxysilane- functionalized core-shell latexes were successfully synthesized via miniemulsion copolymerization of the butyl acrylate, styrene with MPS as the functional monomer in the presence of the modified silica. When these latexes dried at room-temperature, the post-cross-linking occurred due to the alkoxysilane groups on the particle surface and lead to the formation of the films. The morphology of the nanocomposite latexes and the mechanical properties, thermal properties, fire-resistant, optical properties and micro-structure of the resulted films were characterized and discussed. Scanning electron microscope result showed most of the nanoparticles dispersed homogeneously in the polymer matrix when the content of MPS-silica was 10%. However, when the content of MPS-silica nanoparticles was beyond 10%, the aggregation of the nanoparticles became obvious. The tensile test showed that the stress at break increased a lot with the increase of silica content. The thermal and fire-resistant behaviors of the nanocomposite films were improved greatly by the incorporation of silica particles. The optical test showed that the hybrid film was comparable to the pure polymer film at around 84% transmittance.
Jianfeng Gou,Qiuling Ma,Yuqi Cui,Xiaoyong Deng,Huixuan Zhang,Xiuwen Cheng,Xiaoli Li,Mingzheng Xie,Qingfeng Cheng,Huiling Liu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
In this study, high visible light response and charge separation efficiency of body-centered cubic Ag3PO4sub-microcrystals were fabricated through ultrasound-precipitation process. Additionally, the parameterswere optimized by photocatalytic (PC) removal degradation of diclofenac based on response surfacemethodology. Results indicated that the PC removal efficiency of diclofenac was significantly affected byAg3PO4 content and pH value. Under the optimized conditions, 99.9% of diclofenac could be degradedwithin 16 min Xenon illumination. Furthermore, three PC removal degradation pathways of diclofenacwere proposed, including OH-adduct to aromatic ring, direct oxidation by photoinduced holes anddecarboxylation of side chain from the parent compound.
Yuqi Cui,Qi Meng,Xiaoyong Deng,Qiuling Ma,Huixuan Zhang,Xiaoli Li,Mingzheng Xie,Qingfeng Cheng,Xiuwen Cheng 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
In this study, Pt NCs/TiO2 NTAs photoelectrode was fabricated through anodization process, followed byrecycle pulse electrodeposition strategy. Subsequently, physicochemical properties of the resultingsamples were studied systematically. Results indicated that Pt NCs/TiO2 NTAs photoelectrode exhibitedintense light absorbance both in the UV and visible region, high transient photocurrent density of0.089 mA cm 2 and open circuit potential of 0.275 V cm 2. In addition, 98.3% of aspirin could beeliminated within 4 h Xenon illumination with the help of +0.4 V potential. Furthermore, it can beconcluded that two tentative pathways for PEC degradation of aspirin were proposed and confirmed.