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Prediction and optimization of process parameter of friction stir welded AA5083-H111 aluminum alloy using response surface methodology

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Journal of Central South University 2012年第1期19卷 1-8页

作者： r.palanivel P.Koshy Mathews Department of Mechanical Engineering Kalaivani College of TechnologyCoimbatoreIndia research and Development Department of Mechanical EngineeringKalaivani College of TechnologyCoimbatoreIndia

A systematic approach was presented to develop the empirical model for predicting the ultimate tensile strength of AA5083-H111 aluminum alloy which is widely used in ship building industry by incorporating friction stir welding(FSW) process parameters such as tool rotational speed,welding speed,and axial *** was carried out considering three-factor five-level central composite rotatable design with full replications *** surface methodology(rSM) was applied to developing linear regression model for establishing the relationship between the FSW process parameters and ultimate tensile *** of variance(ANOVA) technique was used to check the adequacy of the developed *** FSW process parameters were also optimized using response surface methodology(rSM) to maximize the ultimate tensile *** joint welded at a tool rotational speed of 1 000 r/min,a welding speed of 69 mm/min and an axial force of 1.33 t exhibits higher tensile strength compared with other joints.

关键词： friction stir welding design expert design of experiments analysis of variance (ANOVA) response surfacemethodology (rSM) optimization

Optimization of process parameters to maximize ultimate tensile strength of friction stir welded dissimilar aluminum alloys using response surface methodology

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Journal of Central South University 2013年第11期20卷 2929-2938页

作者： r.palanivel P.Koshy Mathews N.Murugan Kalaivani College of Technology Coimbatore Institute of Technology

Aluminium alloys generally present low weldability by traditional fusion welding process. Development of the friction stir welding （FSW） has provided an alternative improved way of producing aluminium joints in a faster and reliable manner. The quality of a weld joint is stalwartly influenced by process parameter used during welding. An approach to develop a mathematical model was studied for predicting and optimizing the process parameters of dissimilar aluminum alloy （AA6351 T6-AA5083 Hlll）joints by incorporating the FSW process parameters such as tool pin profile, tool rotational speed welding speed and axial force. The effects of the FSW process parameters on the ultimate tensile strength （UTS） of friction welded dissimilar joints were discussed. Optimization was carried out to maximize the UTS using response surface methodology （rSM） and the identified optimum FSW welding parameters were reported.

关键词： frictions stir welding dissimilar aluminum alloy tool pin profile design of experiments rSM material flow behavior optimization

Mechanical and metallurgical properties of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys

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Transactions of Nonferrous Metals Society of China 2014年第1期24卷 58-65页

作者： r.palanivel P.KOSHY MATHEWS I.DINAHArAN N.MUrUGAN Department of Mechanical Engineering Roever College of Engineering and Technology Department of Mechanical Engineering Kalaivani College of Technology Department of Mechanical Engineering V V College of Engineering Department of Mechanical Engineering Coimbatore Institute of Technology

The microstructure and mechanical characterization of dissimilar friction stir welded AA5083-H111 and AA6351-T6 aluminum alloys were studied. Three different welding speeds （36, 63 and 90 mm/min） were used to weld the dissimilar alloys. The effect of welding speed on mechanical and metallurgical properties was analyzed. It is found that the welding speed of 63 mm/min produces better mechanical and metallurgical properties than other welding speeds. The weld zone is composed of three kinds of microstructures, namely unmixed region, mechanically mixed region and mixed flow region. The fracture mode was observed to be a ductile fibrous fracture.

关键词： aluminum alloys friction stir welding welding speed tensile strength microstructure

Synthesize of AZ31/TiC magnesium matrix composites using friction stir processing

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Journal of Magnesium and Alloys 2015年第1期3卷 76-78页

作者： M.Balakrishnan I.Dinaharan r.palanivel r.Sivaprakasam Department of Mechanical Engineering Akshaya College of Engineering and TechnologyCoimbatore 642109Tamil NaduIndia Department of Mechanical Engineering V V College of EngineeringTisaiyanvilai 627657Tamil NaduIndia Department of Mechanical Engineering Roever College of Engineering and Technology621212 PerambalurTamil NaduIndia Department of Aeronautical Engineering Karpagam UniversityCoimbatore 641021Tamil NaduIndia

Friction stir processing(FSP)is a novel solid state technique to synthesize metal matrix *** the present work,an attempt has been made to synthesize AZ31/TiC magnesium matrix composites using FSP and to analyze the microstructure using scanning electron microscopy.A groove was prepared on 6 mm thick AZ31 magnesium alloy plates and compacted with TiC *** width of the groove was varied to result in four different volume fraction of TiC particles(0,6,12 and 18 vol.%).A single pass FSP was carried out using a tool rotational speed of 1200 rpm,traverse speed of 40 mm/min and an axial force of 10 *** electron microscopy was employed to study the microstructure of the synthesized *** results indicated that TiC particles were distributed uniformly in the magnesium matrix without the formation of *** was no interfacial reaction between the magnesium matrix and the TiC *** particles were properly bonded to the magnesium matrix.

关键词： Magnesium alloy Friction stir processing TiC Microstruture

rare earth(Gd,La) co-doped ZnO nanoflowers for direct sunlight driven photocatalytic activity

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Journal of rare Earths 2023年第1期41卷 77-84页

作者： Baskaran palanivel romulo r.Macadangdang Jr Md Shahadat Hossain Fahad A.Alharthi Mohanraj Kumar Jih-Hsing Chang Sreedevi Gedi Department of Physics Kings Engineering CollegeSriperumbudurKancheepuram602117TamilnaduIndia Department of Medical Technology Institute of Arts and SciencesFar Eastern UniversityManilaPhilippines Department of Innovation Systems Engineering Graduate School of EngineeringUtsunomiya UniversityYoto 7-1-2Utsunomiya321-8585Japan Chemistry Department College of ScienceKing Saud UniversityRiyadh1145Saudi Arabia Department of Environmental Engineering and Management Chaoyang University of Technology168Jifeng E.Rd.Wufeng DistrictTaichung41349TaiwanChina School of Chemical Engineering Yeungnam UniversityGyeongsan38541Republic of Korea

In this work Gd/La@ZnO nanoflower photocatalyst was successfully synthesized by a co-precipitation method and applied for rhodamine B(rh B) and tetracycline(TCN) degradation under direct sunlight *** doping of rare earth elements extends the optical absorption wavelength of ZnO from UV region(390 nm) to visible-light region(401 nm).In addition,the co-doped ZnO nanoflower exhibits a lower charge recombination efficiency which was confirmed by photoluminescence emission ***,the co-doped ZnO nanoflower exhibits the maximum degradation efficiency of 91% for rh B and 74% for TCN under sunlight *** calculated synergistic index of co-doped ZnO is higher than that of the pure *** radicals’ production was confirmed by terephthalic acid(TA) and nitro-blue tetrazolium(NBT) *** holes and hydroxyl(·OH) radicals play the major role in degradation reaction and it was confirmed by scavenger’s ***,the recycling test confirms the stability of the photocatalyst.

关键词： Gd La ZnO Nanoflower Photocatalyst Sunlight

Effect of rGO support on Gd@ZnO for UV-visible-light driven photocatalytic organic pollutant degradation

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Journal of rare Earths 2023年第10期41卷 1525-1531,I0002页

作者： Baskaran palanivel Md Shahadat Hossain romulo r.Macadangdang Jr. S.Sahaya Jude Dhas Abdullah M.Al-Enizi Mohd Ubaidullah Woo Kyoung Kim Sreedevi Gedi S.Ignatius Arockiam Department of Physics Kings Engineering CollegeSriperumbudurKancheepuram602117Tamil NaduIndia Department of Innovation Systems Engineering Graduate School of EngineeringUtsunomiya UniversityYoto 7-1-2Utsunomiya 321-8585Japan College of Allied Health National UniversityManila1008Philippines Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia School of Chemical Engineering Yeungnam UniversityGyeongsan38541Republic of Korea PG and research Department of Chemistry GTN Arts CollegeDindigul624005Tamil NaduIndia

In this manuscript,we report the hydrothermally prepared rGO/Gd@ZnO nanocomposite for the utilization of photocatalytic rh B(rhodamine B)dye *** required characterization techniques were carried out to analyse the structural,morphological,chemical,environmental and optical behaviour of the prepared *** efficiency of the prepared nanoparticles was studied by rh B dye degradation upon UV-Vis-light illumination which reveals that composite catalyst degrades the dye molecule about 91%after 40 min of *** comparing the higher degradation efficiency of the rGO/Gd@ZnO nanocomposite with that of ZnO and Gd doped ZnO,it reveals a greater reduction of charge carriers'recombination,higher visible-light utilization and higher adsorption *** trapping experiment and recycling test were conducted to study the influence of active radicals for the degradation reaction and to know the stability of the prepared nanocomposite,***,this rGO supported Gd doped ZnO nanocomposite can provide a new path way in preparing a highly efficient photocatalyst for organic pollutant degradation at large.

关键词： rGO Gd doped ZnO UV-Vis photocatalyst Dye degradation rare earths

Synergistic anticancer effect of green synthesized nickel nanoparticles and quercetin extracted from Ocimum sanctum leaf extract

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Journal of Materials Science & Technology 2018年第3期34卷 508-522页

作者： palanivel rameshthangam Jeyaraj Pandian Chitra Department of Biotechnology Science Campus Alagappa University Department of Biochemistry Manonmaniam Sundaranar University

Leaf extract of medicinally important plant Ocimurn sanctum （O. sanctum） has been used for the synthesis of nickel nanoparticles （NiGs） and extraction of quercetin （Qu）. Qu has been conjugated with NiGs for enhanced anticancer effect on human breast cancer MCF-7 cells. Extracted Qu was conjugated with polyethylene glycol （PEG） coated NiGs （Qu-PEG-NiGs） which was used as carriers for breast cancer treatment. Anticancer activity of Qu-PEG-NiGs was evaluated by assessing cell viability, reactive oxygen species （rOS） production, caspase activity, mitochondrial membrane potential （MMP） and changes in nuclear morphology （staining methods）. 0.85 mg of quercetin was extracted from I g of leaves with retention time （rt） of 2.914 rain. Loading and encapsulation efficiency of quercetin onto PEG-NiGs was 15.04% and 82% respectively and Qu-PEG-NiGs has shown a sustained release of Qu of about 84% after 48 h. Qu and Qu-PEG-NiGs showed dose dependent （1.56-50 μg/mL） anticancer effect against MCF-7 cells with IC50 values of 50 and 6.25 μg/mL respectively which was mediated by oxidative stress due to rOS over-production that induced loss of mitochondrial membrane potential, capsase -9, -7 activities leading to apoptosis. The present study validates that Qu-PEG-NiGs can be used as a potential anticancer agent for cancer therapy.

关键词： Nickel nanoparticles Quercetin Anticancer Apoptosis MCF-7 cells Ocimum sanctum

An EOQ model of non-instantaneous deteriorating items with price,time-dependent demand and backlogging

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Journal of Control and Decision 2021年第2期8卷 135-154页

作者： r.Sundararajan M.palanivel r.Uthayakumar Department of Mathematics PSNA College of Engineering and Technology624622 DindigulTamilnaduIndia Department of Mathematics Mepco Schlenk Engineering CollegeSivakasiIndia Department of Mathematics The Gandhigram Rural Institute-Deemed UniversityGandhigramIndia

This paper considers an inventory model with non-instantaneous deteriorating item in which demand rate is a function of selling price and time,taking account of time value of *** paper aids the retailer in maximising the total profit by determining optimal replenishment *** are allowed which are partially *** model also takes into cognizance the fact that in business activities nowadays customers are given delay in *** these assumptions,a mathematical model is formulated over a finite planning horizon and then some useful theoretical results have been framed to characterise the optimal *** necessary and sufficient conditions for the existence and the uniqueness of the optimal solutions are also *** algorithm is designed to find the optimum solutions of the proposed *** examples are included to illustrate the algorithmic procedure and the effects of key parameters are studied to analyse the behaviour of the model.

关键词： Inventory deterioration backlogging inflation finite planning

Two-warehouse inventory model for non-instantaneous deteriorating items with optimal credit period and partial backlogging under inflation

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Journal of Control and Decision 2016年第2期3卷 132-150页

作者： M.palanivel r.Uthayakumar Department of Mathematics The Gandhigram Rural Institute-Deemed UniversityDindigulIndia

This paper analyses an inventory model for non-instantaneous deteriorating items under a two-warehouse system with the effect of inflation and time value of *** propose the model from the seller’s prospective by incorporating the fact that granting the trade credit from the seller to its buyer not only increases sales and revenue but also opportunity cost and default ***,in this model,shortages are allowed and partially *** backlogging rate is dependent on the waiting time for the next *** purpose of this study is to determine the optimal credit period and the optimal order quantity such that the total profit of the seller is *** numerical examples are presented for illustrating the proposed inventory ***,sensitivity analysis of the optimal solutions with respect to major parameters is carried out and some managerial inferences are obtained.

关键词： two-warehouse non-instantaneous partial backlogging trade credit inflation