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A Method to Evaluate Abrasion of Shoe-Sole Using 3D Scanning Technique

Journal of Sports Science 2016年第5期4卷 279-286页

作者： Glen Lim Chun Yee Yeo Joon Hock Tsuyoshi Nishiwaki Kenta Moriyasu kenichi harano Nanyang Technological University~School of Mechanical & Aerospace Engineering 50 Nanyang Avenue Singapore 639798Singapore ASICS Institute of Sport Science ASICS Corporation 2-1 Takatsukadai 6-chome Nishi-ku Kobe 651-2271 Japan

A study was carried out to evaluate abrasion of shoe-sole for subjects with different running gait. A 3 dimensional （3D） scanning approach together with a commercial software, CloudCompare Mesh Cloud Comparison was utilized for this study. In CloudCompare, a grid system and colored scale was applied to identify the region and extend of abrasion of the shoe-sole. This study clearly showed the extent of abrasion on regions of shoe-sole identified from the colored scale. This paper was done with kind support from Asics Institute for Sports Science, Kobe, Japan and Institute for Sport Research （ISR-NTU）.

关键词： Shoe wear pattern cloud comparison 3D Wear analysis.

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Laser Processing Mechanism of Monocrystalline Diamond

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Journal of Mechanics Engineering and Automation 2011年第3期1卷 191-199页

作者： Etsuji Ohmura Katsuko harano kenichi Watatani Keiji Ebata Graduate School of Engineering Osaka University Suita 565-0871 Japan Sumitomo Electric Industnes LTD Itami 664-0016 Japan

When a Nd：YAG laser, the wavelength of which is permeable for diamond, is focused on the surface of a diamond sample, a layer of surface material is ablated. Therefore, diamond can be cut by repetitive irradiation. In this study, the processing mechanism of ablation for a single crystal diamond was examined using a heat conduction analysis, considering laser absorption at the surface or the temperature dependence of absorption coefficient. When the laser beam is absorbed at the surface layer, the surface layer is ablated during an early period in the laser pulse. Once the absorption surface layer is ablated, the laser beam penetrates the base material and ablation stops. On the other hand, if the authors assume that single crystal diamond has the temperature dependence of absorption coefficient which is about equal to that of CVD （chemical vapor deposition） diamond, the temperature rise is not enough to ablate the material. However, it became clear that the diamond is ablated deeply when the authors consider both absorption at the surface layer and the temperature dependence of the absorption coefficient. It can be considered that the surface is transformed to graphite and becomes the absorption layer during the repetitive irradiation. It is estimated that the phase change to graphite is very small and its volume fraction is a few percent at most.

关键词： Laser ablation laser cutting single crystal diamond absorption layer absorption coefficient heat conduction analysis

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