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Experimental study of the effect of slotted blades on the Savonius wind turbine performance

Theoretical & Applied Mechanics Letters 2021年第3期11卷 162-171页

作者： Dominicus Danardono Dwi Prija Tjahjana Zainal Arifin suyitno suyitno Wibawa Endra Juwana Aditya Rio Prabowo Catur Harsito Department of Mechanical Engineering Universitas Sebelas MaretSurakartaIndonesia Vocational School of Mechanical Engineering Universitas Sebelas MaretSurakartaIndonesia

This study investigates the effect of Reynolds number on the performance of Savonius wind turbine with slotted *** turbine performance investigation was based on the torque coefficient(Ct),power coefficient(Cp),and tip speed ratio(TSR).The experiment used two number of blade configuration,blade overlap ratio of 10%,12.5%and 20%,slotted position of 15%,20%,25%and 35%,and also slotted gap width of 3 mm,5 mm,7 mm,and 9 *** wind speed carried out in this experiment are 5.94 m/s,6.46 m/s,6.99 m/s,and 7.27 m/s,which are generated from the fan blowers as a wind *** Savonius turbine with 10%overlap ratio shows the best *** highest Cp obtained is 0.138 by the variation of a 3 mm gap with Re of 1.44×10^(4) and 0.526 TSR.

关键词： Reynolds number Slotted blades Savonius wind turbine

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Surface modification of titanium using steel slag ball and shot blasting treatment for biomedical implant applications

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 788-795页

作者： Budi Arifvianto suyitno Muslim Mahardika Center for Innovation of Medical Equipments and Devices(CIMEDs) Department of Mechanical and Industrial EngineeringFaculty of EngineeringGadjah Mada UniversityJl.Grafika 2 Yogyakarta 55281Indonesia

Surface modification is often performed using grit or shot blasting treatment for improving the performances of biomedical implants. The effects of blasting treatments using steel slag balls and spherical shots on the surface and subsurface of titanium were studied in this paper. The treatments were conducted for 60-300 s using 2-5 mm steel slag bails and 3.18 mm spherical shots. The surface morphology, roughness, and elemental composition of titanium specimens were examined prior to and after the treatments. Irregular and rough titanium surfaces were formed after the treatment with the steel slag balls instead of the spherical shots. The former treatment also introduced some bioactive elements on the titanium surface, but the latter one yielded a harder surface layer. In conclusion, both steel slag ball and shot blasting treatment have their own specialization in modifying the surface of metallic biomaterials. Steel slag ball blasting is potential for improving the osseointegration quality of implants; but the shot blasting is more appropriate for improving the mechanical properties of temporary and load bearing implants, such as osteosynthesis plates.

关键词： biomedical implants titanium surface treatment blasting

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Effect of cold working and sandblasting on the microhardness, tensile strength and corrosion resistance of AISI 316L stainless steel

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International Journal of Minerals,Metallurgy and Materials 2012年第12期19卷 1093-1099页

作者： suyitno Budi Arifvianto Teguh Dwi Widodo Muslim Mahardika Punto Dewo Urip Agus Salim Center for Innovation of Medical Equipments and Devices (CIMEDs) Department of Mechanical and Industrial Engineering Faculty of Engineering Universitas Gadjah MadaJl. Grafika 2 Yogyakarta 55281 Indonesia

The aim of this work is to investigate the effect of cold working and sandblasting on the microhardness, tensile strength and corro-sion rate of AISI 316L stainless steel. The specimens were deformed from 17% to 47% and sandblasted for 20 min using SiC particles with a diameter of 500-700 μm and an air flow with 0.6-0.7 MPa pressure. The microhardness distribution and tensile test were conducted and a measurement on the corrosion current density was done to determine the corrosion rate of the specimens. The result shows that the cold working enhances the bulk microhardness, tensile and yield strength of the specimen by the degree of deformation applied in the treatment. The sandblasting treatment increases the microhardness only at the surface of the specimen without or with a low degree of deformation. In addition, the sandblasting enhances the surface roughness. The corrosion resistance is improved by cold working, especially for the highly deformed specimen. However the follow-up sandblasting treatment reduces the corrosion resistance. In conclusion, the cold working is prominent to be used for improving the mechanical properties and corrosion resistance of AISI 316L stainless steel. Meanwhile, the sandblasting subjected to the cold worked steel is only useful for surface texturing instead of improving the mechanical properties and corrosion resistance.

关键词： stainless steel cold working sandblasting microhardness tensile strength corrosion resistance

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