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Acoustical properties of a 3D printed honeycomb structure filled with nanofillers:Experimental analysis and optimization for emerging applications

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Defence Technology（防务技术） 2024年第5期35卷 248-258页

作者： Jeyanthi subramanian Vinoth kumar selvaraj Rohan singh ilangovan s Naresh Kakur Ruban Whenish school of Mechanical Engineering Vellore Institute of TechnologyChennai600127Tamil NaduIndia Department of Mechanical Engineering SRM Institute of Science and TechnologyRamapuramChennai600089India Department of Chemical Engineering and Materials science University of Southern CaliforniaLos Angeles90089USA Advanced Materials Research Centre Technology Innovation InstituteAbu Dhabi9639UAE Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVellore632014Tamil NaduIndia

The novelty of this research lies in the successful fabrication of a 3D-printed honeycomb structure filled with nanofillers for acoustic properties,utilizing an impedance tube setup in accordance with AsTM standard E *** Creality Ender-3,a 3D printer,was used for printing the honeycomb structures,and polylactic acid(PLA)material was employed for their *** organic,inorganic,and polymeric compounds within the composites were identified using fourier transformation infrared(FTIR)*** structure and homogeneity of the samples were examined using a field emission scanning electron microscope(FEsEM).To determine the sound absorption coefficient of the 3D printed honeycomb structure,numerous samples were systematically developed using central composite design(CCD)and analysed using response surface methodology(RsM).The RsM mathematical model was established to predict the optimum values of each factor and noise reduction coefficient(NRC).The optimum values for an NRC of 0.377 were found to be 1.116 wt% carbon black,1.025 wt% aluminium powder,and 3.151 mm distance between parallel ***,the results demonstrate that a 3Dprinted honeycomb structure filled with nanofillers is an excellent material that can be utilized in various fields,including defence and aviation,where lightweight and acoustic properties are of great importance.

关键词： 3D printing Honeycomb structure Acoustics Field emission scanning electron microscope Response surface methodology

Effect of composition and aging time on hardness and wear behavior of Cu-Ni-sn spinodal alloy

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Journal of Central south University 2019年第10期26卷 2634-2642页

作者： s.ilangovan R.VAIRA VIGNEsH R.PADMANABAN J.GOKULACHANDRAN Department of Mechanical Engineering Amrita School of Engineering

Copper alloyed with various compositions of nickel and tin were cast into molds under argon *** cast rods were homogenized,solution heat treated,followed by aging for different time *** specimens were characterized for microstructure and tested for microhardness and wear rate.A hybrid model with a linear function and radial basis function was developed to analyze the influence of nickel,tin,and aging time on the microhardness and tribological behavior of copper-nickel-sin alloy *** results indicate that increase in the composition of nickel and tin increases the microhardness and decreases the wear rate of the *** increase in the concentration of nickel and tin decreases the peak aging time of the alloy system.

关键词： spinodal decomposition microhardness wear radial basis function model

Effect of tool pin profile on microstructure and tensile properties of friction stir welded dissimilar AA 6061e AA 5086 aluminium alloy joints

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Defence Technology（防务技术） 2015年第2期11卷 174-184页

作者： M.ilangovan s.RAJENDRA BOOPATHY V.BALAsUBRAMANIAN Department of Mechanical Engineering College of Engineering GuindyAnna University Center for Materials Joining & Research (CEMAJOR) Department of Manufacturing EngineeringAnnamalai University

Joints between two different grades of aluminium alloys are need of the hour in many light weight military *** this investigation,an attempt has been made to join the heat treatable(AA 6061) and non-heat treatable(AA 5086) aluminium alloys by friction stir welding(FsW)process using three different tool pin profiles like straight cylindrical,taper cylindrical and threaded *** microstructures of various regions were observed and analyzed by means of optical and scanning electron *** tensile properties and microhardness were evaluated for the welded *** this investigation it is founded that the use of threaded pin profile of tool contributes to better flow of materials between two alloys and the generation of defect free stir *** also resulted in higher hardness values of 83 HV in the stir zone and higher tensile strength of 169 MPa compared to other two *** increase in hardness is attributed to the formation of fine grains and intermetallics in the stir zone,and in addition,the reduced size of weaker regions,such as TMAZ and HAZ regions,results in higher tensile properties.

关键词：摩擦搅拌焊铝合金接头焊接接头组织与性能轮廓扫描电子显微镜异种刀具

Microstructure and tensile properties of friction stir welded dissimilar AA6061-AA5086 aluminium alloy joints

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Transactions of Nonferrous Metals society of China 2015年第4期25卷 1080-1090页

作者： M.ilangovan s.RAJENDRA BOOPATHY V.BALAsUBRAMANIAN Department of Mechanical Engineering College of Engineering Guindy Anna UniversityChennai India Center for Materials Joining & Research Department of Manufacturing Engineering Annamalai UniversityAnnamalai Nagar Chidambaram 608002 Tamilnadu India

The fusion welding of dissimilar heat treatable and non-heat treatable aluminium alloy faced many problems related to solidification. The difficulties can be overcome to achieve the combined beneficial properties of both aluminium alloys using friction stir welding(FsW). The microstructural features and tensile properties of friction stir welded(FsW) similar and dissimilar joints made of AA6061 and AA5086 aluminium alloys were investigated. The microstructures of various regions were observed and analyzed by means of optical and scanning electron microscopy. Microhardness was measured at various zones of the welded joints. The tensile properties of the joints were evaluated and correlated with the microstructural features and microhardness values. The dissimilar joint exhibits a maximum hardness of HV 115 and a joint efficiency of 56%. This was attributed to the defect free stir zone formation and grain size strengthening.

关键词： friction stir welding dissimilar joint aluminium alloy microstructure tensile strength