Prediction of wear resistance model for magnesium metal composite by response surface methodology using central composite design

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Prem Sagar ◽  
Amit Handa
Keyword(s):  
Wear Resistance ◽  
Response Surface Methodology ◽  
Central Composite Design ◽  
Process Parameters ◽  
Wear Mechanism ◽  
Metal Composite ◽  
Magnesium Metal ◽  
Content Type ◽  
Tool Rotation ◽  
Central Composite

Purpose In recent days, friction stir processing (FSP) has emerged as a pioneering approach for the manufacture of composites with enhanced mechanical and tribological properties. The present study aims to examine the impact of process parameters such as tool rotation speed and number of FSP pass on the AZ61A/TiC magnesium metal composite for responses such as hardness and wear resistance. Design/methodology/approach To minimize number of experimental runs, design of experiment was configured according to the response surface methodology using central composite design. Analysis of variance has been conducted to develop mathematical and empirical model for studying relationship between tool rotation and number of pass for responses such as microhardness and wear resistance. Microhardness was checked on vickers microhardness testing machine, and tribological behavior were examined on pin-on-disc using tribotester. Wear morphology was analyzed via scanning electron microscopy. Findings The responses were predicted using validated mathematical model, and contour plots were generated to study the interaction and influence of process parameters. Wear observations suggest that for the base magnesium alloy adhesive wear mechanism was dominating and for the developed nanocomposites, abrasive wear mechanism is a prominent factor. It was also observed that both the selected parameters significantly influenced the responses. Originality/value To the best of the authors’ knowledge, no prior work has been conducted with this material and preparation of composites with TiC nanoparticles. Furthermore, no mathematical models have been developed to predict the response values.

scholarly journals Central Composite Design: a Response Surface Methodology Approach in Biodegradation of Textile Dye Wastewater

2021 ◽  
Vol 43 (6) ◽  
pp. 461-475
Author(s):  
Nur Hanis Mohamad Hanapi ◽  
Sharifah Hanis Yasmin Sayid Abdullah ◽  
Azimah Ismail ◽  
Hafizan Juahir
Keyword(s):  
Response Surface Methodology ◽  
Chemical Oxygen Demand ◽  
Central Composite Design ◽  
Response Surface ◽  
Process Parameters ◽  
Oxygen Demand ◽  
Textile Dye ◽  
Initial Concentration ◽  
Bacterial Inoculum ◽  
Central Composite

Objectives : This study evaluated and identified the removal of colors and chemocal oxygen demands from thextile dye effluents by Bacillus cereus isolated from the local textile wastewater treatment plant.Methods : Central composite design (CCD) from response surface methodology (RSM) was applied in order to achieve the optimized treatment process condition for the textile dyes wastewater degradation. Two-level of three process parameters with six center points resulted a total of twenty runs of experiments were performed. Bacterial inoculum (-1,+1) (%, v/v), agitation (-1, +1) (rpm), and pH (-1, +1) were tested.Results and Discussion : During the ten days of biodegradation process, highest decolourization achieved was 88.67% with low pH and agitation; and medium level of initial concentration of bacterial inoculum. Highest chemical oxygen demand (COD) removal was achieved with 99.20% from high pH (pH 10), low agitation (100 rpm) and high initial concentration of bacterial inoculum (15%, v/v).Conclusions : The biological treatments was able to remove colour and chemical oxygen demand with application of CCD, giving the optimum settings of the three process parameters studied.

scholarly journals Optimization of Eugenol Extraction from Clove Oil using Response Surface Methodology

2015 ◽  
Vol 9 (11) ◽  
pp. 68
Author(s):  
Widayat Widayat ◽  
Hadiyanto Hadiyanto ◽  
Bambang Cahyono ◽  
Ngadiwiyana Ngadiwiyana
Keyword(s):  
Response Surface Methodology ◽  
Optimum Condition ◽  
Central Composite Design ◽  
Response Surface ◽  
Design Method ◽  
Main Process ◽  
Clove Oil ◽  
Design Variables ◽  
Central Composite

The objective of this research was to obtain optimum condition of eugenol production from clove oil using a central composite design method. The main process occured in the eugenol production was saphonification and neutralization processes. In order to optimize these processes, the ratio of NaOH/clove oil and temperature were studied as design variables i.e. ratio of NaOH/clove oil=1:2.5-1:3.5 while temperature was varied between 40 and 60oC. The yield of eugenol was considered as the main response in of this experiment. The result showed that the optimum condition was achieved when the temperature and the ratio of NaOH/clove oil were 50oC and 2.75:1, respectively and the yield was 39.17%.<br />

scholarly journals Pembuatan Biodiesel dari Minyak Sawit Off-Grade Menggunakan Katalis CaO Melalui Proses Dua Tahap

2015 ◽  
Vol 10 (3) ◽  
Author(s):  
Febrina Dwi Putri ◽  
Zuchra Helwani ◽  
Drastinawati Drastinawati
Keyword(s):  
Response Surface Methodology ◽  
Central Composite Design ◽  
Response Surface ◽  
Central Composite

Biodiesel merupakan sumber bahan bakar alternatif yang bisa dihasilkan dari minyak nabati melalui transesterifikasi dengan metanol. Sawit Off-grade merupakan salah satu sumber minyak nabati yang mempunyai potensi untuk digunakan sebagai bahan dasar produksi biodiesel. Reaksi transesterifikasi dilangsungkan dengan bantuan katalis CaO dari cangkang telur yang dikalsinasi pada suhu 900ºC selama 2 jam. Tujuan dari penelitian ini adalah untuk memproduksi biodiesel dari minyak sawit off-grade melalui reaksi dua-tahap, melihat performa katalis Cao terhadap reaksi transesterifikasi, serta mempelajari pengaruh temperatur reaksi, rasio mol minyak:metanol dan konsentrasi katalis terhadap yield biodiesel pada reaksi transesterifikasi. Esterifikasi dilakukan pada suhu 60°C dengan perbandingan mol minyak:metanol 1:12 menggunakan 1%wt katalis H2SO4. Asam lemak bebas (ALB) tereduksi dari 16,18% menjadi 0,6%. Reaksi transesterifikasi dilakukan dengan variasi perbandingan mol minyak:metanol 1:7, 1:9, 1:11, konsentrasi katalis 2%wt, 4%wt, 6%wt, serta suhu reaksi pada 50ºC, 60ºC, 70ºC selama 2 jam. Data yang diperoleh diproses dengan menggunakan response surface methodology (RSM), sedangkan jumlah eksperimen ditentukan dengan central composite design (CCD). Yield yang diperoleh pada penelitian ini yaitu sebanyak 62,30%-87,41%. Yield optimum dihasilkan pada reaksi dengan suhu 70ºC menggunakan minyak:metanol dengan perbandingan 1:11 dan katalis CaO 2%wt. Kondisi proses yang berpengaruh terhadap yield biodiesel adalah suhu reaksi, perbandingan mol minyak:metanol, serta interaksi antara suhu dengan perbandingan mol minyak:metanol. Akan tetapi tidak ditemukan adanya pengaruh signifikan konsentrasi katalis terhadap yield biodiesel.

scholarly journals OPTIMASI TEKSTUR BUAH TOMAT SETELAH SIMULASI TRANSPORTASI MENGGUNAKAN RESPON SURFACE METODOLOGY (RSM)

2019 ◽  
Vol 7 (2) ◽  
pp. 139-147
Author(s):  
Ida Ayu Widhiantari ◽  
Sandra Sandra ◽  
Gunomo Djoyowasito
Keyword(s):  
Response Surface Methodology ◽  
Central Composite Design ◽  
Response Surface ◽  
Central Composite

Selama kegiatan transportasi buah tomat dapat mengalami kerusakan akibat adanya frekuensi getaran yang berasal dari mesin transportasi dan juga lama waktu kegiatan transportasi. Adanya getaran selama proses transportasi buah tomat dapat mempengaruhi perubahan tekstur buah tomat. Optimasi dilakukan dalam penelitian ini dengan tujuan untuk memperoleh mutu buah tomat yang optimal setelah dilakukan simulasi transportasi. Optimasi dilakukan dengan menggunakan Response Surface Methodology (RSM) central composite design (CCD) dengan dua variabel bebas yaitu frekuensi getaran (3 Hz, 6HZ, dan 9Hz) dan lama waktu penggetaran (120, 150, dan 180 menit) serta tekstur buah tomat sebagai respon. Kondisi optimum diperoleh pada frekuensi getaran  2,33 Hz dan waktu simulasi transportasi 133,42 menit dengan nilai tekstur optimum buah tomat yaitu 0,147768 dengan nilai desirability sebesar 0,928.    

scholarly journals Optimization of Pectin Extraction from Nephrolepis biserrata Leaves Using Response Surface Methodology

2014 ◽  
Vol 625 ◽  
pp. 920-923 ◽  
Author(s):  
Halifah Pagarra ◽  
Roshanida Abd Rahman ◽  
Rosli Md. Illias ◽  
Nor Azah Ramli
Keyword(s):  
Response Surface Methodology ◽  
Optimum Condition ◽  
Central Composite Design ◽  
Galacturonic Acid ◽  
Dry Weight ◽  
Extraction Time ◽  
Extraction Condition ◽  
Degree Of Esterification ◽  
Independent Variables ◽  
Central Composite

A central composite design was employed to optimize the extraction of pectin from Nephrolepis biserrata leaves. The independent variables were pH (1.5 to 2.5), extraction time (60 to 120 minutes) and temperature (60oC to 100oC). The combined effect of these variables on yields of pectin was investigated. The results showed that the yield of extracted pectin ranged from 3.76% to 8.50% (w/w, based on dry weight of Nephrolepis biserrata leaves). The optimum condition for the yield of pectin extraction was predicted at pH (1.5), extraction time (76.25 minutes) and temperature (100oC). Under the optimum condition, the actual pectin yield was 8.18%, which was below the predicted extraction condition of 8.316 %. The characteristics were 47.52% galacturonic acid and 83.71% degree of esterification. Keyword: Nephrolepis biserrata leaves, Extraction, Pectin, RSM, Characterization.

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