Mekanika: Majalah Ilmiah Mekanika最新文献_第4页

The Effect of Stirrer Depth And Electroless Coating of Hardness And Tensile Strength in Aluminium Matrix Composite AL6061-AL2O3 搅拌深度和化学涂覆对铝基复合材料AL6061-AL2O3硬度和抗拉强度的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2021-03-31 DOI: 10.20961/MEKANIKA.V20I1.48073

S. Andini, E. Surojo, T. Triyono

{"title":"The Effect of Stirrer Depth And Electroless Coating of Hardness And Tensile Strength in Aluminium Matrix Composite AL6061-AL2O3","authors":"S. Andini, E. Surojo, T. Triyono","doi":"10.20961/MEKANIKA.V20I1.48073","DOIUrl":"https://doi.org/10.20961/MEKANIKA.V20I1.48073","url":null,"abstract":"Metal matrix composite (MMC) are composite materials that are widely used in the industrial sector. Examples of metal matrix composites are Al6061 as matrix alloys and Al2O3 as reinforcement. In general, making Al6061-Al2O3 composites using the stir casting method. The stirring parameter in the stir casting affects the physical and mechanical properties of the composites. The physical and mechanical properties of composites can be improved by increasing the wettability of the reinforcement. This research was conducted to determine the effect of the depth of stirring and electroless coating treatment on the hardness and tensile strength of Al6061-Al2O3 composites. The process of making composites with Al2O3 reinforcing particles with 6% weight fraction mixed with aluminum alloys and 2.5% magnesium powder as a wetting agent. Variations of this study were the depth of the stirrer and electroless coating treatment. The depths of stirring used for the experiment were 30%, 45%, and 60% of the height of the fluid. The testing phases in this study were the density and porosity test, metallographic observation, hardness test, and tensile test. The most efficient variation of the mixer depth was obtained at a mixer depth of 30% of the fluid height. The highest hardness and tensile strength test results are hardness value of 72.43 HBN and tensile strength of 182.19 MPa with electroless coating reinforcement treatment","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132267343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of the Pressure Vessel Saddle Thickness Effect to Stress Distribution 压力容器鞍座厚度对应力分布影响的仿真研究

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2021-03-31 DOI: 10.20961/MEKANIKA.V20I1.44938

Krisdiyanto Krisdiyanto

引用次数: 0

Surface Roughness and Fiber Angular Orientation Analysis Toward Laminated Composite Crack Propagation 层状复合材料裂纹扩展的表面粗糙度和纤维角取向分析

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2021-03-31 DOI: 10.20961/MEKANIKA.V20I1.48188

H. Firmansyah, Bayu Pranoto, C. Gunawan, H. Wicaksono, M. Fakhruddin

{"title":"Surface Roughness and Fiber Angular Orientation Analysis Toward Laminated Composite Crack Propagation","authors":"H. Firmansyah, Bayu Pranoto, C. Gunawan, H. Wicaksono, M. Fakhruddin","doi":"10.20961/MEKANIKA.V20I1.48188","DOIUrl":"https://doi.org/10.20961/MEKANIKA.V20I1.48188","url":null,"abstract":"Composite is a material that consisting of two or more materials, either micro or macro, where the properties of the material differ in shape and chemical composition from the original substance. In this study, fatigue testing of fiber metal composites was carried out to determine the rate of crack propagation so that the age of the fiber metal composite specimen was known. The independent variable in this research is the angular orientation of the carbon fiber and the surface roughness of the aluminum with the dependent variable response is the bridge crack rate. The manufacture of fiber metal laminates specimens uses the Vacuum Resin Infuse (VARI) method, which uses a vacuum pump as a means to flow the resin from the reservoir to the mold. This method is used to minimize the occurrence of air bubbles trapped on the specimen which causes porosity defects which will reduce the strength of the metal laminates specimen itself. Fatigue testing is performed using the stress amplitude method. That is, the value of the load when the tensile test is one third of the tensile strength. After the fatigue test was carried out, the results were obtained on specimens with an angular orientation of 0/90 ° fibers, the crack propagation rate slowed down with a cycle value of 90000 in specimens with a surface roughness value of 2.128 µm then decreased cycles on specimens with a value of 2.887 µm, namely 11000 cycles.","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122789821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Karakterisasi dan Laju Biodegradasi Biokomposit Serbuk Tulang Sapi/Shellac/Tepung Tapioka sebagai Material Pengisi Tulang 牛骨/虫胶/木薯粉粉的特性和生物降解速度作为骨料

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2020-03-30 DOI: 10.20961/mekanika.v19i1.39913

J. Triyono, Bhorin Tantomo Christiawan, Abu Masykur

{"title":"Karakterisasi dan Laju Biodegradasi Biokomposit Serbuk Tulang Sapi/Shellac/Tepung Tapioka sebagai Material Pengisi Tulang","authors":"J. Triyono, Bhorin Tantomo Christiawan, Abu Masykur","doi":"10.20961/mekanika.v19i1.39913","DOIUrl":"https://doi.org/10.20961/mekanika.v19i1.39913","url":null,"abstract":"Hasil RISKESDAS menyatakan kasus patah tulang di Indonesia cukup tinggi untuk setiap tahunnya akibat dari kecelakan, jatuh, dan trauma benda tumpul. Salah satu metode penyelesaian dari patah tulang adalah dengan melakukan implan material bone filler dengan komponen dasarnya adalah hidroksiapatit. Tujuan dari penelitian ini adalah untuk mengetahui apakah tepung tapioka dan shellac akan hilang setelah proses sintering, dan mengetahui pengaruh tepung tapioka pada pembentukan porusitas dan degradasi pada material biokomposit BHA. Penelitian ini menggunakan metode kalsinasi untuk menghilangkan zat organik pada serbuk tulang sapi, kompaksi untuk membentuk sebuah tablet biokomposit BHA/Shellac/Tapioka, dan proses sintering untuk menghasilkan porusitas pada tablet spesimen uji. Berdasarkan hasil analisis data uji yang dilakukan, dapat disimpulkan bahwa pengamatan SEM memperlihatkan porusitas yang terjadi pada spesimen uji. Pengamatan pola difraktogram XRD menunjukkan 2θ nilai sampel sesuai dengan pola difraktogram standar HA JCPDS 9-432. Pengamatan spektrum FTIR menunjukkan adanya tiga titik puncak utama yang berupa gugus fungsi fosfat ( ), karbonat ( ) dan hidroksil (OH-). Dari ketiga pengamatan tersebut menunjukkan bahwa kandungan tapioka dan shellac telah hilang sepenuhnya saat proses sintering dan hanya menyisakan kandungan BHA dan semakin banyak campuran tapioka yang digunakan akan mempercepat laju degradasi.","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"117 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125722107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pembakaran Bersama Biomassa dan Batu Bara: Pengaruh Rasio Biomassa-Batu Bara dan Excess Air

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2020-03-30 DOI: 10.20961/mekanika.v19i1.40039

Heru Sutarto, Tito Gusti Nurrohim, Albert Xaverio Ilyas, S. Suyitno

引用次数: 2

Ferrite Magnet Effect terhadap Emisi Gas Buang Four Stroke Engine 125 CC 铁氧体磁体效应废气排放四冲程发动机125cc

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2020-03-30 DOI: 10.20961/mekanika.v19i1.40011

F. Y. Utama, Y. Pratama

{"title":"Ferrite Magnet Effect terhadap Emisi Gas Buang Four Stroke Engine 125 CC","authors":"F. Y. Utama, Y. Pratama","doi":"10.20961/mekanika.v19i1.40011","DOIUrl":"https://doi.org/10.20961/mekanika.v19i1.40011","url":null,"abstract":"<div class=\"WordSection1\"><div class=\"WordSection1\">Emisi gas buang merupakan zat/unsur dari pembakaran didalam ruang bakar yang dilepas ke udara yang ditimbulkan oleh kendaraan bermotor, sehingga dapat menimbulkan dampak terhadap lingkungan, terutama dapat menyebabkan polusi udara, lingkungan, dan perubahan iklim global. Untuk mengatasi permasalahan tersebut diperlukan cara lain agar dapat menghemat bakar yang sederhana, bahan relatif murah, dan mudah didapatkan. Salah satu caranya menggunakan ferrite magnet untuk mengurangi emisi gas buang yang dihasilkan. Metode yang digunakan dalam penelitian ini berdasarkan standar SNI 19-7118.3-2005 dengan pengukuran emisi gas buang pada kendaraan berbahan bakar bensin yang dilakukan pada kondisi idle. Namun untuk penelitian dapat juga dilakukan pengujian pada bukaan katup (throttle) yang berubah yang menggunakan metode pengujian kecepatan berubah dengan katup (throttle) terbuka penuh. Dari penelitian ini diperoleh bahwa pemasangan ferrite magnet pada kendaraan four stroke engine 125 cc dapat mempengaruhi emisi gas buang kendaraan yang dihasilkan saat menggunakan bahan bakar pertalite maupun pertamax. Kadar emisi gas buang yang didapat adalah 562 ppm vol (ferrite pertalite) untuk gas HC, 8,53% untuk gas CO (pertalite/pertamax), 10,8% untuk gas CO2 (ferrite pertamax), dan untuk gas O2 kadar emisinya sebesar 14,91% (ferrite pertalite).</div></div>","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130734589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

PENGARUH VARIASI CAMPURAN OKSI-ASETILEN PADA PROSES FLAME HEATING TERHADAP SIFAT FISIS DAN MEKANIK ALUMINIUM SERI 7075

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2019-11-13 DOI: 10.20961/MEKANIKA.V18I2.35406

Purnadityanto Purnadityanto, T. Triyono, Nurul Muhayat

引用次数: 0

DIAGNOSIS KETIDAKLURUSAN (MISALIGNMENT) POROS MENGGUNAKAN METODE MULTICLASS SUPPORT VECTOR MACHINE (SVM) 基于蒙古纳坎方法的多类支持向量机诊断

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2019-11-13 DOI: 10.20961/mekanika.v18i2.35403

Wanto Wanto, D. Susilo

{"title":"DIAGNOSIS KETIDAKLURUSAN (MISALIGNMENT) POROS MENGGUNAKAN METODE MULTICLASS SUPPORT VECTOR MACHINE (SVM)","authors":"Wanto Wanto, D. Susilo","doi":"10.20961/mekanika.v18i2.35403","DOIUrl":"https://doi.org/10.20961/mekanika.v18i2.35403","url":null,"abstract":"<pre>Misalignment is a condition where the centerlines of two coupled shafts do not coincide. Misalignment is the commonly fault in rotating machinery. Detection and diagnosis of shaft misalignment is crucial to achieve its optimal performance. The purpose of research is to diagnose shaft misalignment using multiclass support vector machine (SVM). The time-domain vibration signals of a shaft alignment rig with normal, parallel misalignment and angular misalignment of shaft conditions were obtained from vibration measurement signals. The accelerometer was used to measure vibration with a sampling frequency of 20 kHz at the constant speed operation of 1000 rpm. The features of median, RMS, crest factor, variance, kurtosis, shape factor, impulse factor, skewness, range, standard deviation and maximum were extracted from the vibration signal. The Principal Component Analysis (PCA) was applied for reduce the number of variables for data input to principal components with lower dimension. The multiclass SVM with One Against One (OAO) methodand linear kernel were used for classification. The results show that SVM for diagnosis of shaft misalignment show a good performance with an accuracy of 100%.</pre>","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"89 44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129809456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANALISIS PENGARUH INFILL OVERLAP TERHADAP KARAKTERISTIK PRODUK HASIL 3D PRINTING DENGAN MENGGUNAKAN MATERIAL POLY LACTIC ACID (PLA)

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2019-11-13 DOI: 10.20961/mekanika.v18i2.35408

Fajri Sri Ardion, H. Sukanto, J. Triyono

{"title":"ANALISIS PENGARUH INFILL OVERLAP TERHADAP KARAKTERISTIK PRODUK HASIL 3D PRINTING DENGAN MENGGUNAKAN MATERIAL POLY LACTIC ACID (PLA)","authors":"Fajri Sri Ardion, H. Sukanto, J. Triyono","doi":"10.20961/mekanika.v18i2.35408","DOIUrl":"https://doi.org/10.20961/mekanika.v18i2.35408","url":null,"abstract":"<div class=\"WordSection1\">Rapid prototyping or commonly known as additive manufacturing uses metal and non-metal semi-liquid materials which are compacted layer by layer. Fused deposition modeling (FDM) is one of the methods in the additive manufacturing process that uses thermoplastic filaments (PLA and ABS). Poly Lactic Acid (PLA) or poly lactic acid is an organic plastic or bioplastic made from renewable biomass sources such as corn starch, pea starch and vegetable oils. Important factors affecting the quality of 3D Printing results are nozzle diameter, nozzle temperature, bed temperature, infill patern, infill percentage, print speed, layer thickness and infill overlap. Infill overlap is the percentage of overlapping processes of the filament during the printing process. This research was conducted to determine the effect of infill overlapon the physical and mechanical properties of 3d printing products. The infill overlapvariations used are 0%, 25%, 50%, and 75% of the nozzle diameter. 50% variation shows better quality when compared to other variations for density test, tensile test, and bending test.</div> ","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130059769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

EXPERIMENTAL STUDY THE EFFECT ANGLE OF BLADE ON THE ELECTRICAL POWER OUTPUT OF PROPELLER PICOHYDRO TURBINE 实验研究了桨叶角度对螺旋桨水轮机输出功率的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2019-11-13 DOI: 10.20961/mekanika.v18i2.35405

Abdullah Shalih, P. J. Widodo, D. A. Himawanto

引用次数: 1