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surface textures of quartz grains from a core at the Prydz Bay,Antarctica

Chinese Journal of Polar Science 1997年第2期8卷 24-29页

作者：王祥珍吴时国李传荣陈虹勋罗又郎

In this paper, shapes and surface textures of quartz grains in 13 layers of a core (NP95 1) collected from a continental slope at the Antarctic Prydz Bay were quantitatively and statistically analyzed. The quartz grain surfaces exhibit the characteristics caused by intense glaciation and a weaker chemical solution precipitation, indicating the sediments are mainly morainic debris under a low energy marine environment. The obtained quantitatively statistical results of the assemblages of surface textures caused by the chemical solution precipitation are well correlated to the analytical results of micropaleontologic analysis and can be used to better explain the changes of sedimentary environment and paleoclimate occurred in the marine zone concerned.

关键词： Antarctica quartz grains surface textures quantitative statistics sedimentary environment paleoclimatic change.

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Interlaminar Bonding Performance of UHPC/SMA Based on Diagonal Shear Test

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 97-108页

作者：丁庆军 LEI Yuxiang 张高展 CHENG Huaqiang ZHAO Mingyu GUO Kaizheng School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Advanced Building Materials Key Laboratory of Anhui Province School of Material Science and Chemical EngineeringAnhui Jianzhu UniversityHefei 230601China Wuhan Municipal Construction Group Co. LtdWuhan 430023China School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110000China

To evaluate various interlaminar bonding reinforcement techniques used for steel bridge decks,the UHPC surface was roughened with shot blasting(SB),transverse grooving(TG)and surface embedded stone(S),epoxy resin(E),epoxy asphalt(EA)and high viscosity high elasticity asphalt(HV)as interlayer bonding materials.In addition,a diagonal shear test was conducted using a self-designed diagonal shear jig.The effects of adhesive layer materials type,surface texture type,and different loading rates on the interlaminar bonding performance of UHPC/SMA combination specimens were investigated.The experimental study showed that the peak shear strength and shear modulus of the combined specimen decreased gradually with the decrease of thermosetting of the adhesive layer materials.The peak shear fracture energy of E was greater than that of HV and EA.The synergistic effect of the contact force generated by the roughing of the UHPC surface,the friction force,and the bonding force provided by the adhesive layer material can significantly improve the interlaminar shear performance of the assemblies.The power-law function of shear strength and shear modulus was proposed.The power-law model of peak shear strength and loading rate was verified.The shear strength and predicted shear strength satisfy the positive proportional functions with scale factors of 0.985,1.015,0.961,and 1.028,respectively.

关键词： UHPC SMA bonding materials surface textures loading rate bonding performance

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Investigation on the adhesive contact and electrical performance for triboelectric nanogenerator considering polymer viscoelasticity

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Nano Research 2021年第12期14卷 4625-4633页

作者： Chenfei Wang Xiaoli Wang Yanqiang Hu Lizhou Li Zhihao Li Heng Wu Zirui Zhao Department of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

The triboelectric nanogenerator(TENG)is a new mechanical energy harvesting technology in which the typical viscoelastic material polydimethylsiloxane(PDMS)is widely used.Micro-/nano-textures are often fabricated on the PDMS surface to enhance the electrical performance of TENG.As the contact region decreases to micro/nano scale,the adhesive forces become dominant.However,there is still a lack of contact mechanics model considering both material viscoelasticity and the adhesive forces to guide the surface texture design.In this paper,the explicit data-fitting formulas based on the fractional derivative Zener model are firstly derived to identify the viscoelastic constitutive parameters,which can not only avoid the influence of the initial contact point,but also ensure the accurate conversion between the creep compliance and the relaxation modulus function.Then a viscoelastic-adhesive contact model based on the fitted constitutive parameters is established,and the numerical algorithms such as bi-conjugate stabilized(Bi-CGSTAB)method and fast Fourier transform(FFT)technique are employed to analyze the effects of material viscoelasticity and texture sizes on the contact and electrical performance.It is shown that,compared with results from the elastic-adhesive contact model,the contact area ratio based on the viscoelastic-adhesive contact model is significantly larger,which is much closer to the experimental results.Among the selected sizes of pyramid texture,the higher electrical performance can be obtained from the textures with a smaller pitch and a larger width under the heavier applied load.This study can provide a theoretical reference for the design of viscoelastic surface texture of TENG.

关键词： triboelectric nanogenerator surface textures viscoelasticity adhesive forces contact mechanics electrical characteristics

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