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slippery Customers

China Weekly 2024年第3期 33-35页

作者： Yu Yuanr 不详

More than a decade after the first gutter oil'scandal hit the food industry,consumer confidence has been dented again after hot pot restaurants were found to be recycling cooking oil.Is increased use ofbiqfuel the ans... 详细信息

关键词： cooking restaurant slip

Effects of temperature on critical resolved shear stresses of slip and twining in Mg single crystal via experimental and crystal plasticity modeling

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镁合金学报(英文) 2023年第6期11卷 2027-2041页

作者： Kwang Seon Shin Lifei Wang Mingzhe Bian Shihoon Choi Alexander Komissarov Viacheslav Bazhenov Magnesium Technology Innovation Center Department of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Korea Laboratory of Medical Bioresorption and Bioresistance Moscow State University of Medicine and DentistryDelegatskaya 20/1Moscow127473 Russia Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China Departments of Advanced Components and Materials Engineering Sunchon National UniversitySuncheonJeonnam57922Republic of Korea Laboratory of Hybrid Nanostructured Materials National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia Casting Department National University of Science and Technology"MISiS"Leninskiy pr.4Moscow119049 Russia

Magnesium(Mg)single crystal specimens with three different orientations were prepared and tested from room temperature to 733 K in order to systematically evaluate effects of temperature on the critical resolved shear stress(CRSS)of slips and twinning in Mg single crystals.The duplex non-basal slip took place in the temperature range from 613 to 733 K when the single crystal samples were stretched along thedirection.In contrast,the single basal slip and prismatic slip were mainly activated in the temperature range from RT to 733 K when the tensile directions were inclined at an angle of 45°with the basal and the prismatic plane,respectively.Viscoplastic self-consistent(VPSC)crystal modeling simulations with genetic algorithm code(GA-code)were carried out to obtain the best fitted CRSSs of major deformation modes,such as basal slip,prismatic slip,pyramidalⅡ,{1012}tensile twinning and{1011}compressive twinning when duplex slips accommodated deformation.Additionally,CRSSs of the basal and the prismatic slip were derived using the Schmid factor(SF)criterion when the single slip mainly accommodated deformation.From the CRSSs of major deformation modes obtained by the VPSC simulations and the SF calculations,the CRSSs for basal slip and{1012}tensile twinning were found to show a weak temperature dependence,whereas those for prismatic,slip and{1011}compressive twinning exhibited a strong temperature dependence.From the comparison of previous results,VPSC-GA modeling was proved to be an effective method to obtain the CRSSs of various deformation modes of Mg and its alloys.

关键词： Magnesium Single crystal Critical resolve shear stress slip Twinning

Development of a Tribofidelic Human Heel Surrogate for Barefoot slip Testing

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Journal of Bionic Engineering 2022年第2期19卷 429-439页

作者： Subhodip Chatterjee Arnab Chanda Centre for Biomedical Engineering Indian Institute of Technology DelhiNew Delhi 110016India Department of Biomedical Engineering All India Institute of Medical ScienceNew Delhi 110029India

Barefoot slips contribute to over 37% of recurrent fall-related injuries across all age groups.To study slip risk across a wide range of flooring conditions,slip meters with barefoot surrogates(i.e.,sensors,as per ASTM standard nomenclature)such as animal skins and rubbers have been used to date,which exhibit biomechanical and frictional properties widely different from the barefoot human skin.Development of a surrogate which can accurately simulate the human heel skin properties would be immensely beneficial for realistic assessment of barefoot slipping risk.A novel surrogate was developed using 3D scanning and printing,and biomimetics,which precisely simulates the biomechanical and frictional properties of the barefoot human heel skin.Mechanical slip testing was conducted with this surrogate on three common bathroom floorings and with six different contaminants.Coefficient of Friction(COF)results similar to human slipping experiments,high repeatability and reproducibility across wet and oily flooring conditions,were confirmed through experiments with the developed heel skin surrogate.The heel skin surrogate would be an indispensable model for accurate estimation of barefoot risk against slips and falls in bathrooms,bathtubs,and swimming pools.

关键词： Barefoot Surrogate slip Fall Bathroom Bathtub

Anisotropy in dynamic recrystallization behavior of AZ31 magnesium alloy

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Journal of Magnesium and Alloys 2022年第12期10卷 3470-3484页

作者： S.M.Fatemi S.Kheyrabadi H.Paul Department of Metallurgy and Materials Engineering Shahid Rajaee Teacher Training University136-16785 TehranIran Institute of Metallurgy and Materials Science Polish Academy of Sciences(PAS)25 Reymonta Street30-059 KrakowPoland

Deformation behavior as well as microstructural evolutions of a rolled AZ31 magnesium alloy with and without pre-existing extension twins were studied using compression tests which performed along different orientations at a temperature range of 25–350 ℃. The results implied that the initial texture not only influence the evolution of flow stress, but also change the size and fraction of recrystallized grains.In contrast to samples parallel to rolling and transverse directions, compression along normal direction resulted in a respectful softening at 150 ℃. The largest size and fraction of new grains at 250 ℃ were recorded after deformation along rolling direction, while the maximum flow softening was observed during deformation along normal direction. The anisotropy in microstructural evolutions was still retained at 350 ℃. Pre-existing twins could reduce the anisotropy of material in respect of flow stress as well as DRX progression, where TD sample showed the lowest DRX fraction at 250 ℃. Quaternion misorientation data obtained from EBSD analysis of pretwinned material implied that initial texture could not significantly influence final texture. A different misorientation distribution was realized after deformation of pretwinned material along ND and RD directions.

关键词： slip Recrystallization Grain size Growth Twin

Achieving High Strength-plasticity of Nanoscale Lamellar Grain Extracted from Gradient Lamellar Nickel

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 67-78页

作者： Zimeng Wang Yunfei Jia Yong Zhang Pei Tang Xiancheng Zhang Shantung Tu Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Traditional metallic materials usually face a dilemma between high strength and poor strain hardening capacity.However,heterogeneous structured metallic materials have been found to obviously overcome the trade-of.Herein,gradient lamellar structure was fabricated through ultrasound-aided deep rolling technique in pure Ni with high stacking fault energy after heat treatment.The gradient lamellar Ni was successively divided into the four regions.In-situ micropillar compression tests were conducted in diferent regions to reveal the corresponding microscopic mechanical properties.Microscopic characterization techniques were performed to explore underlying deformation mechanisms and the efects of microstructural parameters on deformation behaviors.This work demonstrates that the micropillar with near nanoscale lamellar thickness possesses excellent strength and plasticity.On one hand,the reason for high strength of near nanoscale micropillar is that the strength of micropillar increases with the decrease of lamellar thickness according to the Hall-Petch efect.On the other hand,numerous lamellar grain boundaries perpendicular to the loading direction is found to hinder the motion of slip bands,resulting in great strain hardening capacity in the near nanoscale lamellar micropillar.

关键词： Nanoscale lamellar structure Compression test slip Dislocation

Quantitative study on the tension-compression yield asymmetry of a Mg-3Al-1Zn alloy with bimodal texture components

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Journal of Magnesium and Alloys 2022年第6期10卷 1680-1693页

作者： Lingyu Zhao Wenhao Chen Beian Zhou Cong He Changjian Yan Zhaoyang Jin Huihui Yu Yunchang Xin School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China Key Laboratory for Light-weight Materials Nanjing Tech University 10009China National Institute for Materials Science 1-2-1 SengenTsukub1305-0047Japan Institute of Corrosion Science and Technology Guangdong 510070China Institute of Applied Physics Jiangxi Academy of SciencesNanchang 330029China

This study demonstrates the yield asymmetry in Mg-3Al-1Zn alloy containing both ND-texture(c-axis//ND(Normal direction))and TD-texture(c-axis//TD(Transverse direction))in a quantitative view.The results showed that the yield asymmetry is strongly dependent on the distribution of bimodal texture components,on the basis of the successful establishment of the quantified relationship between pre-deformation parameters and texture components distribution.It’s meaningful for providing key reference to texture design.Mechanical behavior of bimodal textured Mg alloy under tension and compression was tested.CYS/TYS(compressive yield stress/tensile yield stress)equal to 1 is obtained,implying that the yield asymmetry is eliminated when two textures distribute at specific fractions.The corresponding mechanism for the texture-dependence of tension-compression yield asymmetry is revealed by the analysis of slip/twinning activities and a compound use of the activation stress difference of slip/twinning(ΔStress)and geometrical compatibility factor(m′)between neighboring grains.Balanced activity of{10■2}twinning and a quite similar boundary obstacle effect against slip/twinning transfer under tension and compression accounts for such good symmetry performance.

关键词： Mg alloy Texture Mechanical anisotropy Twinning slip

Effect of plantar pressure on stepping friction under cross-slope condition

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Biosurface and Biotribology 2022年第1期8卷 15-22页

作者： Yanzhao Wang Deqiang Chen Yongzhen Zhang Yongping Niu Xiaohui Yang National United Engineering Laboratory for Advanced Bearing Tribology Henan University of Science and TechnologyHenanLuoyangChina School of Materials Science and Engineering Henan University of Science and TechnologyHenanLuoyangChina Department of Neurology The First Affiliated Hospital of Henan University of Science and TechnologyHenanLuoyangChina

There are various walking pavements in daily life.slip accidents will happen if required friction for safe walking is greater than available friction between the foot and ground surface.Existing researches mostly focus on horizontal or slope pavements,whereas the cross-slope walkways are less.A self-developed gait friction test platform was used to test friction,distribution of plantar pressure and spatiotemporal parameters of human walking under cross-slope condition.With the increase of cross-slope angles,the mediolateral friction increases(R^(2)=0.972,Pslip and fall than low foot.Therefore,plantar pressure distribution of both feet was shifted to left.The gait cycle was prolonged(P<0.001),swing period of both feet decreased(P=0.029)and support period increased(P=0.015)with the increase of cross-slope angle.

关键词： cross-slope walkway slip spatiotemporal parameters

Transformation and removal of ammonium sulfate aerosols and ammonia slip from selective catalytic reduction in wet flue gas desulfurization system

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Journal of Environmental Sciences 2020年第2期32卷 72-80页

作者： Teng Cheng Xincheng Zhou Linjun Yang Hao Wu Hongmei Fan Key Laboratory for Energy Thermal Conversion and Control Ministry of EducationSoutheast UniversityNanjing 210096China Jiangsu Frontier Electric Technology Co. Ltd.Nanjing 211102China School of Energy and Mechanical Engineering Nanjing Normal UniversityNanjing 210042China

Selective catalytic reduction(SCR) denitration may increase the emission of NH4+and NH3.The removal and transformation characteristics of ammonium sulfate aerosols and ammonia slip during the wet flue gas desulfurization(WFGD) process, as well as the effect of desulfurization parameters, were investigated in an experimental system equipped with a simulated SCR flue gas generation system and a limestone-based WFGD system.The results indicate that the ammonium sulfate aerosols and ammonia slip in the flue gas from SCR can be partly removed by slurry scrubbing, while the entrainment and evaporation of desulfurization slurry with accumulated NH4+will generate new ammoniumcontaining particles and gaseous ammonia.The ammonium-containing particles formed by desulfurization are not only derived from the entrainment of slurry droplets, but also from the re-condensation of gaseous ammonia generated by slurry evaporation.Therefore,even if the concentration of NH4+in the desulfurization slurry is quite low, a high level of NH4+was still contained in the fine particles at the outlet of the scrubber.When the accumulated NH4+in the desulfurization slurry was high enough, the WFGD system promoted the conversion of NH3 to NH4+and increased the additional emission of primary NH4+aerosols.With the decline of the liquid/gas ratio and flue gas temperature, the removal efficiency of ammonia sulfate aerosols increased, and the NH4+emitted from entrainment and evaporation of the desulfurization slurry decreased.In addition, the volatile ammonia concentration after the WFGD system was reduced with the decrease of the NH4+concentration and p H values of the slurry.

关键词： Selective catalytic reduction (SCR) Wet flue gas desulfurization (WFGD) Ammonium sulfate Ammonia slip Emission characteristics

slip casting and pressureless sintering of Ti3AlC2

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Journal of Advanced Ceramics 2019年第3期8卷 367-376页

作者： Yimin GONG Wubian TIAN Peigen ZHANG Jian CHEN Yamei ZHANG Zhengming SUN Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and EngineeringSoutheast UniversityNanjing211189China Jiangsu Key Laboratory of Construction Materials School of Materials Scienceand EngineeringSoutheast UniversityNanjing211189China

slip casting and subsequent pressureless sintering(PLS)allow the preparation of complex-shaped and large-sized Ti3AlC2 components for many potential applications.The behaviors of the suspensions,green compacts,and sintered samples of Ti3AlC2 were studied in this paper.The optimized condition of 1 wt%of arabic gum as dispersant at pH=10 results in a Ti3AlC2 suspension for slip casting Ti3AlC2 green compacts without macro defects or cracks.The sintering temperature and Al4C3 embedding powder are found to dominate the properties of the sintered Ti3AlC2 samples.The Ti3AlC2 sample sintered at 1450℃for 1.5 h with Al4C3 embedding powder reaches the best properties,namely 95.3%relative density,hardness of 4.18 GPa,thermal conductivity of 29.11W·m-1·K-1,and electrical resistivity of 0.39μΩ·m.The findings in this work may pave the way for the application of MAX phases with large size and complex shape.

关键词： slip casting pressureless sintering(PLS) properties Ti3AlC2