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Influence of sample surface condition on nano indentation experiment

Rare Metals 2002年第2期21卷 131-132页

作者： WANG Yanli, LIN Zhi, LIN Junpin, PENG Jihua, and CHEN GuoliangState Key laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China University of Science and Technology Beijing State Key Laboratory for Advanced Metals and Materials 北京 100083

The microhardness and elastic modules of the materials weremeasured using the Nano Indenter II, which is a new measuring systemfor the mechanical properties of materials on nano-scale. It candetermine themicrohardness, elastic modules and other mechanicalproperties of materials through measuring applied load and depthunder indenter tip. The results indicated that surface condition ofsample such as the surface roughness affects the experimental preci-sion.

关键词： microhardness elastic modules Nano Indenter

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Bending Properties of GCr15 Steel Guide Rail under the Multi-step Loading

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Journal of Wuhan University of Technology(Materials Science) 2010年第4期25卷 561-564页

作者：卢红 JUNG Jae-Youn School of Mechanical and Electronic Engineering Wuhan University of Technology School of Mechanical and Aerospace System Engineering Chonbuk National University

To analyze the bending properties of GCr15 steel guide rail based on the elastic-plastic theory, the novel bending loading method consisting of multi-step loading and corresponding unloading was applied in three specimens with different cross section shape and different heat treatment condition. According to the experimental results, using numerical calculation software program and the numerical simulation with finite element analysis （FEA）, the relationships among the maximal load and displacement on cross section shape with each step bend loading, the loading stroke with the heat treatment condition, and the loading stroke with cross section shape were gained, and also those curves were discussed qualitatively. Finally, the contrast results between the numerical simulation and experiment were carried out to study the influence about the multi-step loading on specimen. It is put forward that enlightenment for the straightening stroke in the precision linear guide rail manufacture process.

关键词： bending properties guide rail multi-step loading stress-strain curve elastic modules

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