http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : R. Pandiyarajan (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Characterization of AA6061-ZrO2-C friction stir welded composite joints
R. Pandiyarajan,M. P. Prabakaran 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.6
In present work, investigation of metallurgical and mechanical characterization of Friction Stir Welded MMC material, theinfluence of micro structural properties on mechanical properties using different heat inputs were conducted. These heat inputgeneration depend on the FSW process parameters such as Tool Rotational Speed, Welding Speed and Axial Load. The FSWprocess parameters were set such as the tool rotational speed in the range of 800 to 1000 rpm, axial load in the range of 4 to6 kN and a constant welding speed 50 mm/min to fabricate the FS welded specimen of MMC materials. These processparameters play a major role in determining grain growth, phase transformation and change in microstructure of differentzones of weldment like welded nugget zone (WNZ), thermo- mechanically affected zone (TMAZ), heat affected zone (HAZ)and base metal (BM). Moreover, the effects of changes in the microstructure help in improvements of mechanical propertieslike tensile strength and hardness. The weld joints obtained with medium heat input produced the fine grains and maximumtensile strength of 198 MPa and hardness of 56 HRB at the tool rotational speed of 800 rpm, welding speed of 50 mm/minand axial load of 5 kN. The optical microscope (OM) and EDX analysis are employed to identify the presence of the matrix,reinforcement particulates in HMMCs and to confirm defect free welds attained at the WZ, TMAZ and HAZ during themedium heat input condition.
-
Mechanical and tribological behavior of the metal matrix composite AA6061/ZrO2/C
R. Pandiyarajan,P. Maran,S. Marimuthu,K.C. Ganesh 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.10
This study investigates the influence of zirconium dioxide (ZrO 2 ) and graphite (C) on the mechanical and tribological behavior of aluminum-based metal matrix composite (AA6061) fabricated through the stir casting. Metal matrix composites (MMC) are prepared with the following weight percentages: 100 % AA; 96 % AA-2 % ZrO 2 -2 % C; 88 % AA-6 % ZrO 2 -6 % C; 92 % AA-6 % ZrO 2 -2 % C; and 96 % AA-2 % ZrO 2 -6 % C. The microstructure and the mechanical and tribological behavior are characterized, and their correlations are obtained. Microstructural studies of the MMC reveal a uniform distribution of ZrO 2 and C particles in the AA6061 matrix. The addition of ZrO 2 improves the hardness from 6 % to 12 % (30 HRC to 40.94 HRC) and the ultimate tensile strength from 8 % to 15 % (128 MPa to 166.3 MPa) of the base metal (AA6061). The tribological behavior of wear and the frictional properties of the MMC are also studied by performing dry sliding wear test using pin-on-disc method. Result shows that the minimum and maximum wear rates of MMC are 5 E-9 and 6.2 E-9 (g/mm), respectively, at speed of 850 rpm and constant sliding distance of 1000 m.
-
M. Satheeshkumar,M.R. Thansekhar,R. Pandiyarajan 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.6
The increasing need for development in microelectronics and systems has naturally led to pursuit of modern advancementsin the field of cooling technology. Microchannels offer excellent high temperature heat management in electronic systems. Microchannels utilize fluids capable of transferring heat energy released by the operating circuits by fluid flow. The fluid flowand nature of fluid are highly resonant on the performance of the microchannel heat sinks. The present work is a novelapproach of an investigation of three-dimensional ceramic based nanofluids flow performance in a fabricated wavymicrochannel heat sink with varying inlet header geometry. The coolant nanofluids investigated are concentrated with silicondioxide (SiO2) and aluminum oxide (Al2O3) ceramic nanoparticles with varying volume percentages and their hydraulic andthermal performance were investigated. Experimental evaluations were performed to determine variations in local Nusseltnumber and axial coefficient of heat transfer for SiO2 and Al2O3 nanoparticles concentration. Computational fluid analysis wasperformed to evaluate transport equations to determine pressure drop, friction factor and Nusselt number of the fluid flow. It was observed that increasing heat flux amplitude causes rise of local maxima of Nusselt number with corresponding decreaseof the local minima. The decrease of local minima was more profound than increase of local maxima. The different inlet headergeometries influence the local Nusselt number with conical frustum header producing the value followed by semi-circular,rectangular and triangular inlet section geometries. The observed Nusselt number and heat transfer rate was highest in caseof Al2O3 followed by SiO2 and distilled water as coolant fluids for the heat sink. Higher Nusselt number was observed forconical frustum and semi-circular inlet header geometries when SiO2 and Al2O3 based coolant fluids were used. High frictionfactor was observed when the nanoparticle concentration was 0.25 volume percentage for the entire Reynolds number underinvestigation. A computational model was utilized to evaluate the drops in pressure in the wavy microchannel and determinefrictional characteristics of the nanofluids in the present work.
-
Correlation of fracture parameters during onset of crack in middle tension specimen
M.S. Starvin,K.C. Ganesh,R. Pandiyarajan 한국CDE학회 2017 Journal of computational design and engineering Vol.4 No.3
The present study addresses the implementation of finite element analysis and the prediction of fracture parameters in a middle tension (MT) specimen that was fabricated using AISI 4140 steel. The correlation of fracture parameters with external loads and crack sizes was investigated. A Finite Element code was developed to simulate the fracture model. The contour integral method was applied in the calculation of stress intensity factor and J-integral in the cracked specimen. The ASTM standard empirical formula was used to calculate the stress intensity factor (SIF) and the numerical predictions were validated. A standard laboratory experiment was also carried out using the MT specimen to calculate the crack growth rate in this specific material. The SIF values were almost linear with external load but it was decreasing as the crack size increases. The crack requires minimum load for crack propagation as the crack size increases. Similarly the J-integral was accelerated with increase in crack size.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
