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All Journal Turbo : Jurnal Program Studi Teknik Mesin Jurnal Teknologi Terapan Infotekmesin Jurnal Pendidikan Teknik Mesin Undiksha Jurnal Vokasi Mekanika AMMA : Jurnal Pengabdian Masyarakat Majalah Teknik Mesin Jurnal Pendidikan Teknik Mesin J-Proteksion : Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Journal of Industrial and Mechanical Engineering
Pujiyulianto, Eko
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Humanities Automotive Engineering Chemistry Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing

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Pengaruh Orientasi Sudut Terhadap Faktor Delaminasi dan Nilai Kekuatan Tarik Pada Proses Pengeboran Komposit Fiberglass woven bermatriks Poliester Paundra, Fajar; Pujiyulianto, Eko; Muhyi, Abdul; Sri Bagaskara, Firman; Manzeis, Ilhan; Ramadhan Siregar, Ilham; Elmiawan, Puguh
Infotekmesin Vol 15 No 2 (2024): Infotekmesin, Juli 2024
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v15i2.2216

Abstract

Composite is a material that is formed from a combination of 2 or more materials. The orientation of the inclination angle of the webbing on the composite affects the tensile strength value. This research was conducted to determine the effect of variations in the angle of inclination of the webbing and the phenomenon of delamination on the value of tensile strength. The process of making fiberglass woven fiber composites and a mixture of resin and catalyst uses the vacuum bagging method. The variations used in this study are the angle of inclination of the webbing 0°, 15°, 30° and 45°. Tensile test specimens using the ASTM D638 standard. The specimens that have been cut will then be perforated with a diameter of 4 mm using a milling machine. Tensile testing was carried out using a Universal Testing Machine. The highest tensile strength value is at an angle of 0° with a value of 189.30 MPa and the lowest tensile strength is at an angle of 45° with a value of 34.25 MPa and for the value of the delamination factor has little effect on the value of tensile strength.
Pengaruh Variasi Waktu Curing Pada Kegagalan Uji Bending Komposit Sandwich Serat Karbon Dengan Core PVC Foam Paundra, Fajar; Rivaldo Aritonang, Joy; Pujiyulianto, Eko; Abdul, Abdul; Elmiawan, Puguh
Infotekmesin Vol 16 No 2 (2025): Infotekmesin: Juli 2025
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v16i2.2730

Abstract

Curing is a method used to enhance the performance of composite materials by heating them in an electric oven for a specific duration and at a controlled temperature. This study aims to examine the effect of curing time variations on the failure analysis of carbon fiber sandwich composites with a PVC foam core under bending tests. The materials used in this research include polyester resin, 240 gsm carbon twill fiber, and a 5 mm thick PVC foam core. The manufacturing method applied was vacuum bagging, followed by a curing process with time variations of 30 minutes, 60 minutes, 90 minutes, and 120 minutes at a constant holding temperature of 80°C. Bending tests were carried out according to ASTM C393 standards. The highest bending strength of the sandwich composite was achieved with a curing time of 120 minutes, reaching 45.55 MPa, while the lowest strength was observed in the specimen without curing, at 25.76 MPa. The failures observed after bending tests included core failures such as core crush, indentation, and delamination, as well as skin failures like micro buckling.
EFFECT OF PREHEATING TEMPERATURE VARIATION ON MICROSTRUCTURE AND HARDNESS OF WELD OVERLAY CLADDING OF SS400 CARBON STEEL BY SMAW METHOD paundra, fajar; Rajagukguk, Kardo; Aldyansyah, Dimas; Pujiyulianto, Eko; Muhyi, Abdul
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/eyamkr90

Abstract

SS400 carbon steel is a type of low carbon steel that has low surface hardness, wears easily, and is not resistant to impact. The application of cladding can reduce the risk of material failure due to the weakness of SS400 carbon steel. In this study, cladding was performed by SMAW method using HV-600 electrodes and a current of 115 A. This welding process causes heat to be concentrated in the melting area, resulting in uneven heating and cooling, so preheating is necessary. This study aims to evaluate the effect of preheating temperature variations of 200°C, 300°C, 400°C, and non-preheating on microstructure and hardness in the cladding process. Macro structural testing shows that the application of preheating can minimize the occurrence of welding defects, and an increase in preheating has an effect on increasing the depth of the HAZ in each specimen tested.  Microstructure testing shows that the application of higher preheating will form more ductile phases in the base metal, diffusion layer, HAZ areas. The base metal area has pearlite and ferrite phases. The diffusion layer shows clear boundaries as a result of the diffusion process. The HAZ section forms a fine pearlite microstructure and coarse pearlite and ferrite phases. The weld metal layer is not affected by the preheating temperature used, there are martensite and ferrite phases. Hardness testing on 200oC preheating specimens has the highest hardness in the weld metal of 680.11 HV. Hardness in the diffusion layer, HAZ, and base metal which shows that an increase in preheating temperature affects the decrease in the hardness value of the specimen.
EFFECT OF VARIATION IMMERSION TIME  FIBER HEMP COMPOSITE USING NaOH MATRIX POLYURETHANE ON TENSILE STRENGTH METHOD paundra, fajar; Wibawa, Gilang Putra; Pujiyulianto, Eko; Syaukani, Muhammad; muhyi, Abdul; Nurullah, Fajar Perdana; Syanur, Farid Nanda
Jurnal Pendidikan Teknik Mesin Vol. 24 No. 02 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/4sj3jr07

Abstract

NaOH immersion treatment on hemp fiber is very important in making composites. This is because natural fibers still contain materials such as lignin and hemicellulose so hemp fibers are cleaner and can provide strong fiber and resin attachment. The aim of this research is to find out how the best time for soaking in NaOH for hemp fiber compares to the tensile strength of hemp fiber composites. The materials used are polyurethane and hemp fiber. The research focused on variations without treatment, 2 hours, 3 hours, 4 hours, and 5 hours with a percentage of 5% NaOH and dried under direct sunlight after soaking. Composite manufacture was carried out using the compression molding method for 24 hours with a pressure of 5 bar. Tensile testing was also used in this research with reference to the ASTM D 638 standard. The fiber surface experiences changes in shape such as cleanliness, color and fiber structure which are different in each variation. It should be noted that the maximum tensile strength is 11,597 MPa at 4 hours of immersion, and the lowest tensile strength is 6,054 MPa at 5 hours of immersion. Then the lowest modulus of elasticity value is found in the variation without treatment at 0,049 GPa. The highest value of elastic modulus is found in the 4 hour variation with a value of 0,076 GPa.
Analisa Pengaruh Variasi Media Pendingin Pada Perlakuan Panas Terhadap Struktur Mikro Dan Nilai Kekerasan Fully Pearlitic Steel Muhyi, Abdul; Ramadhanty, Nabila; Pujiyulianto, Eko; Rajagukguk, Kardo; Paundra, Fajar
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2567

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh variasi media pendingin pada perlakuan panas terhadap nilai kekerasan dan struktur mikro fully pearlitic stell. Proses penelitian dilakukan dengan pemotongan fully pearlitic stell dengan ukuran 10 x 10 x 10 mm, kemudian dilakukan proses perlakuan panas dengan temperatur 900℃, selanjutnya dilakukan proses pendinginan dengan berbeda media pendingin seperti: udara, di dalam oven, air, oli bekas, dan salah satu spesimen yang tidak dilakukan perlakuan apapun sebagai pembanding. Hasil pengujian struktur mikro rel tanpa perlakuan mengandung struktur perlit dan ferit, dengan nilai kekerasan yang didapat 392,64 HVN. Media pendingin udara memiliki fasa ferit dan perlit, dengan nilai kekerasan 335,92 HVN. Pendinginan di dalam oven struktur mikronya adalah sementit, perlit, austenit dengan nilai kekerasan yang diperoleh 287,67 HVN, merupakan nilai kekerasan terendah. Untuk media pendingin air struktur mikro yang terbentuk ferit, austenit, martensit, nilai kekerasannya 915,89 HVN. Untuk pendinginan oli bekas struktur mikronya martensit, austenit, ferit dengan nilai kekerasan 916,38 HVN, media pendingin oli bekas mendapatkan nilai kekekarasan tertinggi.Kata kunci: Perlakuan panas, baja karbon tinggi, kekerasan, struktur mikro.
PENGARUH FRAKSI VOLUME TERHADAP TEGANGAN DAN ELASTISITAS STRUKTUR KISI DENGAN METODE NUMERIK Arif, Muhamad F.; Pujiyulianto, Eko; Muhyi, A.; Paundra, F.; Firdaus, M. Adrian; Munte, Daniel C.
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 1 (2024): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i1.622

Abstract

Penelitian ini bertujuan untuk mengevaluasi pengaruh variasi fraksi volume struktur kisi 3D printing terhadap tegangan dan elastitstas dengan menggunakan metode numerik. Beberapa struktur kisi yang akan dievaluasi yaitu SchwarzD, SchwarzP, ScheonIWP, dan Nevious. Model CAD dari struktur kisi akan dihasilkan dengan menggunakan script berbasis Python. Variasi fraksi volume dihasilkan dengan cara memvariasikan nilai ketebalan shell struktur kisi pada script Python. Analisis dilakukan dengan menggunakan metode numerik berbasis metode elemen hingga dengan analisis statis dan model material elastis. Material yang digunakan adalah material ABS. Berdasarkan hasil penelitian, hubungan ketebalan script dan fraksi volume menunjukan bahwa setiap sturktur kisi akan menghasilkan fraksi volume yang berbeda satu sama lain. Hal ini dapat terlihat ketika memvariasikan nilai ketebalan shell. Semakin besar nilai ketebalan shell maka nilai fraksi volume struktur kisi akan semakin besar. Setiap struktur memberikan respon tegangan yang berbeda, dan setiap tegangan memliki daerah titik konsentrasi tegangan yang berbeda. Setiap struktur kisi memiliki sifat dan prilaku yang unik yang hubunganya tidak selalu linier terhadap fraksi volume. Secara umum, berdasarkan data tersebut, urutan struktur kisi yang memiliki nilai tegangan dan modulus elastisitas paling tinggi hingga yang rendah adalah struktur 3D printing SchwarzD, Nevious, ScheonIWP, dan SchwarzP
ANALYSIS REMANING LIFE ASSESSMENT (RLA) SHELL 1st STAGE SEPARATOR USING API 510 STANDARD Syaukani, Muhammad; Suharno, Suharno; Sukmana, Irza; Mahesa, Iqbal; Pujiyulianto, Eko
Jurnal Vokasi Mekanika (VoMek) Vol 6 No 1 (2024): Jurnal Vokasi Mekanika
Publisher : Departemen Teknik Mesin Fakultas Teknik Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/vomek.v6i1.627

Abstract

This study aims to conduct a Remaining Life Assessment (RLA) on the shell 1st stage separator. The process is carried out through the stages of calculating the minimum permissible shell thickness, MAWP, corrosion rate, and determining the operational feasibility of the separator. The method used is non-destructive test (NDT) inspection to determine the minimum actual thickness. Calculations were made using the API 510 standard. Based on the evaluation of the minimum thickness and MAWP value, the 1st separator shell is still feasible to operate. The ST corrosion rate that occurred in 2012, 2016, and 2019 was 0.123 mm/year, respectively; 0.007 mm/year; and 0.023 mm/year. While the LT corrosion rate is 0.089 mm/year, RLA analysis shows that the remaining life in 2012 was 93.75 years, 93.42 years in 2016, and 92.63 years in 2019. Thus, the shell 1st stage separator is still feasible to operate.
Co-Authors Abdul, Abdul Aditia Prahmana, Rico Aldyansyah, Dimas Andi Kolala, Putra Arif, Muhamad F. Arirohman, Ilham Dwi Budi Darsono, Febri Dicky J. Silitonga Elmiawan, Puguh Firdaus, M. Adrian Gahana Cindi Alfian, Devia galih, Rene hario Hadi Teguh Yudistira, Hadi Teguh Imam Prabowo, Imam Irza Sukmana, Irza Kardo Rajagukguk, Kardo Lathifa Putri Afisna Mahesa, Iqbal Manzeis, Ilhan Maulana, Sena Muhamad Fatikul Arif Muhammad Syaukani Muhyi, A. Muhyi, Abdul muhyi, andul Munte, Daniel C. Nanda Syanur, Farid Nurullah, Fajar Perdana Paundra, F. Paundra, Fajar Perdana Nurullah, Fajar Permata, Ariyo Nurachman Satiya Prabowo, Andi Pratama, Angga Jihan Rakha Yudanta, Faturrizky Ramadhan Siregar, Ilham Ramadhanty, Nabila Rivaldo Aritonang, Joy Rizky Saputra, Rizky Rodian, Afiko Setyawati, Annisa Indah Sidik, M Farhan Sidik, M. Farhan Sidik, Muhammad Farhan Sri Bagaskara, Firman Suharno Suharno Syah, Muhammad Aksel SYANUR, FARID NANDA Wibawa, Gilang Putra Yasmin, Dzikrina Salsabila