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How ploughing and frictional melting regulate ice-skating friction

摩擦:英文版 2023年第11期11卷 2036-2058页

作者： Feng DU Peng KE Ping HONG School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Beijing Sports University Beijing 100084China

The slipperiness of ice is well known while,for ice skating,its mechanism still needs further investigation,where the complex interactions including the thermal conduction of the skate–meltwater–ice system,the ploughing and the frictional melting of ice to the friction force are still unclear.This study presents a theoretical framework and a simplified analytical solution to unveil the friction mechanism when a curved skate sliding on ice.The theory is validated by experiments and the effects of these various factors,including the sliding velocity,the ice temperature,the supporting weight,and the geometry of the skate blade to the friction are revealed in detail.This study finds that the contribution of friction force from the ploughing deformation through skate indentation and that from the fluid friction through the shear motion of the meltwater layer is comparable with each other,which thus clarifies how the ploughing deformation of the ice substrate together with its frictional melting regulates the friction during skating.

关键词： ice friction skating ploughing frictional melting coefficient of friction

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Investigation of Nanoscale Scratching on Copper with Conical Tools Using Particle-Based Simulation

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Nanomanufacturing and Metrology 2023年第1期6卷 49-60页

作者： Anuj Sharma Sivakumar Kulasegaram Emmanuel Brousseau Kane Esien Dan Read School of Engineering Cardiff UniversityCardiff CF243AAUK School of Physics and Astronomy Cardiff UniversityCardiff CF243AAUK Department of Electrical and Computer Engineering University of California Santa BarbaraSanta BarbaraCA 93106USA

In this study,a modeling approach based on smooth particle hydrodynamics(SPH)was implemented to simulate the nanoscale scratching process using conical tools with different negative rake angles.The implemented model enables the study of the topography of groove profiles,scratching forces,and the residual plastic strain beneath the groove.An elastoplastic material model was employed for the workpiece,and the tool–workpiece interaction was defined by a contact model adopted from the Hertz theory.An in-house Lagrangian SPH code was implemented to perform nano-scratching simulations.The SPH simulation results were compared with nanoscale scratching experimental data available in the literature.The simulation results revealed that the normal force was more dominant compared to the cutting force,in agreement with experimental results reported for a conical tip tool with a 60°negative rake angle.In addition,the simulated groove profile was in good agreement with the groove profile produced in the aforementioned experiment.The numerical simulations also showed that the normal and cutting forces increased with the increase in the scratching depth and rake angle.Although the cutting and ploughing mechanisms were noticed in nano-scratching,the ploughing mechanism was more dominant for increased negative rake angles.It was also observed that residual plastic strain exists below the groove surface,and that the plastically deformed layer thickness beneath a scratched groove is larger for more negative values of the tool rake angle and higher scratching depths.

关键词： Nanoscale scratching SPH modeling ploughing Cutting Groove profiles

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ploughing

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中国总会计师 2004年第2期 7-7页

作者： lily

Whenspringcomesandthenaturestartsitsrebirth,ChinaChiefFinancialOfficerisendeavoringtocarveoutanewfield.Thewholeyear’sworkdependsonagoodstartinspring.Onlywhenonestoopstoploughhardthefield,canhehasthehopetoharvest.Therehasbeenthetillagesincetheancienttime,anditisthetraditionofagriculture.Towritefrequentlywithapenisjustlikestoopingtoploughthefield.Thefluentcompositioncomesfromwritingsnowandthen.Totakeupapenwritingabout"ploughing",isreallybecauseIperceivethetimeandsituation,tosingforChinaChiefFinancialOfficerinthenewyear.Fromthisyear,manydifficultiesexitthough,ChinaMagazineofChiefFinancialOfficerwilltakethe"plough"tohaveChinaChiefFinancialOfficerwalktotheworld.Blocksandobstaclesareontheway,buttheycannotstopourforwardsteps.

关键词： work ploughing

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小流域经济与市场经济联结之浅见

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中国水土保持 1995年第8期 51-53页

作者：李秋兰山东省水土保持办公室

小流域经济与市场经济联结之浅见李秋兰（山东省水土保持办公室，济南２５００１３）原水利部部长杨振怀同志于１９９３年撰文指出：“把水土保持引向市场经济是实现９０年代水土流失防治目标的关键。水土保持要适应社会主义市场经济的... 详细信息

小流域经济与市场经济联结之浅见李秋兰（山东省水土保持办公室，济南２５００１３）原水利部部长杨振怀同志于１９９３年撰文指出：“把水土保持引向市场经济是实现９０年代水土流失防治目标的关键。水土保持要适应社会主义市场经济的发展，否则将失去生存和发展的条件，...

关键词： ] soil and water conservation plough measure " rat road" ploughing techniquethe benefit of output increase

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