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KAJI NUMERIK PENCEGAHAN PERTUMBUHAN RETAK DENGAN MENGGUNAKAN METODE MODIFIKASI BENTUK STOP-DRILLED HOLE (SDH) Yudi Dwianda; Hendery Dahlan; Meifal Rusli
Media Mesin: Majalah Teknik Mesin Vol 18, No 2 (2017)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v18i2.5239

Abstract

ABSTRAK Salah satu mekanisme kegagalan yang utama dalam aplikasi teknik atau komponen mesin adalah penjalaran retak kelelahan. Penjalaran retak ini biasanya dimulai dari titik-titik pada daerah yang mengalami konsentrasi tegangan yang tinggi. Oleh karena itu salah satu metode untuk menghambat penjalaran retak adalah  mereduksi konsentrasi tegangan dimana salah satu metode yang digunakan adalah pemberian lubang di ujung retak atau dikenal dengan stop-drilled hole (SDH). Pada penelitian ini akan dikembangkan modifikasi bentuk model SDH. Pada dasarnya model yang dikembangkan ini adalah merubah bentuk pada sisi lubang agar tidak berbentuk lengkungan sehingga  konsentrasi tegangan menurun di daerah tersebut. Pemodelan lubang yang dikembangkan pada peneltian ini adalah penggambungan dua lubang dan tiga lubang pada ujung retak. Pada penelitian ini akan dilakukan penghitungan faktor konsentrasi tegangan untuk variasi jari-jari lubang yang diberikan. Dari penelitian yang telah dilakukan dapat disimpulkan bahwa pemberian dua lubang dan tiga lubang pada ujung cetak tersebut dapat mereduksi faktor konsentrasi tegangan dengan signifikan, nilai faktor konsentrasi tegangan antara dua lubang dan tiga lubang tidak berbeda signifikan terutama dengan meningkatnya nilai jari-jari lubang. Sementara itu, faktor konsentrasi tegangan tetinggi terjadi pada daerah perubahan geometri pada lubang untuk pemberian dua atau tiga lubang, akan tetapi faktor konsentrasi tegangannya masih cukup rendah jika dibandingkan dengan pemberian satu lubang. Kata Kunci : Konsentrasi Tegangan, Penjalaran Retak, Stop-Drilled Hole (SDH)   ABSTRACT One of the major failure mechanisms in engineering applications or machine components is the propagation of fatigue cracking. The spreading of these cracks usually are started from the points on the regions that are  experiencing high stress concentrations. Therefore, one of the method to inhibit this crack propagation is reducing the stress concentration in which one of the used methods  is the provision of a hole at the end of a crack or known as a stop-drilled hole (SDH). In this research will be developed  a modification form of SDH model. Basically the developed model is changing the shape on the hole side so there are not forming of the curve so that the stress concentration decreases in this area. The developed hole model in this research is the binding of two holes and three holes at the crack tip. This research will be calculated the stress concentration factor for variation of given hole radius. From the research that has been done, it can be concluded that the two holes and three holes on the tip of the crack can reduce the stress concentration factor significantly. Moreover,  the value of the stress concentration factor between two holes and three holes is not significantly different, especially with the increment of the hole radius. Meanwhile, the high stress concentration factor occured in the geometrical change area of the hole for two or three holes, but the stress concentration factor is still quite low when compared to the one hole. Keywords : Stress Concentration, Crack Propagation, Stop-Drilled Hole (SDH)
Design and Manufacturing of Soybean Epidermis Peeler Machine Romiyadi Romiyadi; Yudi Dwianda
Jurnal Teknik Mesin (JTM) Vol 9, No 1 (2019)
Publisher : LP2M - Institut Teknologi Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (320.451 KB)

Abstract

The soybean epidermis peeler machine was a machine used to peel of soybean epidermis from  the soybean. The purpose of the study was to design and manufacture of soybean epidermis peeler machine with a capacity of  3 kg for a process. In this study,  the soybean epidermis peeler machine was designed and manufactured with uses 2 shaft to peel the soybean epidermis from the soybean. From the process of designing and manufacturing, has produced a soybean epidermis peeler machine with a capacity of  3 kg for a process. The machine uses a electric motor with a power of 0.5 HP. The transmission system uses pulley transmission between electric motor with 1st shaft and uses sprocket and gear transmission between 1st shaft and 2nd shaft.
KAJI NUMERIK PENCEGAHAN PERTUMBUHAN RETAK DENGAN MENGGUNAKAN METODE MODIFIKASI BENTUK STOP-DRILLED HOLE (SDH) Dwianda, Yudi; Dahlan, Hendery; Rusli, Meifal
Media Mesin: Majalah Teknik Mesin Vol 18, No 2 (2017)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

ABSTRAK Salah satu mekanisme kegagalan yang utama dalam aplikasi teknik atau komponen mesin adalah penjalaran retak kelelahan. Penjalaran retak ini biasanya dimulai dari titik-titik pada daerah yang mengalami konsentrasi tegangan yang tinggi. Oleh karena itu salah satu metode untuk menghambat penjalaran retak adalah  mereduksi konsentrasi tegangan dimana salah satu metode yang digunakan adalah pemberian lubang di ujung retak atau dikenal dengan stop-drilled hole (SDH). Pada penelitian ini akan dikembangkan modifikasi bentuk model SDH. Pada dasarnya model yang dikembangkan ini adalah merubah bentuk pada sisi lubang agar tidak berbentuk lengkungan sehingga  konsentrasi tegangan menurun di daerah tersebut. Pemodelan lubang yang dikembangkan pada peneltian ini adalah penggambungan dua lubang dan tiga lubang pada ujung retak. Pada penelitian ini akan dilakukan penghitungan faktor konsentrasi tegangan untuk variasi jari-jari lubang yang diberikan. Dari penelitian yang telah dilakukan dapat disimpulkan bahwa pemberian dua lubang dan tiga lubang pada ujung cetak tersebut dapat mereduksi faktor konsentrasi tegangan dengan signifikan, nilai faktor konsentrasi tegangan antara dua lubang dan tiga lubang tidak berbeda signifikan terutama dengan meningkatnya nilai jari-jari lubang. Sementara itu, faktor konsentrasi tegangan tetinggi terjadi pada daerah perubahan geometri pada lubang untuk pemberian dua atau tiga lubang, akan tetapi faktor konsentrasi tegangannya masih cukup rendah jika dibandingkan dengan pemberian satu lubang. Kata Kunci : Konsentrasi Tegangan, Penjalaran Retak, Stop-Drilled Hole (SDH)   ABSTRACT One of the major failure mechanisms in engineering applications or machine components is the propagation of fatigue cracking. The spreading of these cracks usually are started from the points on the regions that are  experiencing high stress concentrations. Therefore, one of the method to inhibit this crack propagation is reducing the stress concentration in which one of the used methods  is the provision of a hole at the end of a crack or known as a stop-drilled hole (SDH). In this research will be developed  a modification form of SDH model. Basically the developed model is changing the shape on the hole side so there are not forming of the curve so that the stress concentration decreases in this area. The developed hole model in this research is the binding of two holes and three holes at the crack tip. This research will be calculated the stress concentration factor for variation of given hole radius. From the research that has been done, it can be concluded that the two holes and three holes on the tip of the crack can reduce the stress concentration factor significantly. Moreover,  the value of the stress concentration factor between two holes and three holes is not significantly different, especially with the increment of the hole radius. Meanwhile, the high stress concentration factor occured in the geometrical change area of the hole for two or three holes, but the stress concentration factor is still quite low when compared to the one hole. Keywords : Stress Concentration, Crack Propagation, Stop-Drilled Hole (SDH)
Failure Mode and Effect Analysis (FMEA) of Pneumatic System of CNC Milling Machine Yudi Dwianda
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 65 No 1 (2021): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (163.967 KB) | DOI: 10.36842/jomase.v65i1.239

Abstract

The purpose of this study is to determine the type of failures, the causes, as well as efforts and proposed actions that can be taken to improve the performance of the pneumatic system of CNC milling machines. The Failure Mode and Effect Analysis (FMEA) method is used to find priority problems through Risk Priority Number (RPN) for pneumatic system of components of CNC milling machine. The results of critical component analysis were a leakage occurs in pneumatic valve component, which the most critical risk of the RPN value. It potential failure was caused the high humidity and poor air quality from the compressor, which the RPN of 392 and 384 respectively. The proposed improvement was the replacement of damaged components and optimizing the preventive maintenance, which follow the right operation and maintenance procedures recommended as suggested by the manufacturer.
KAJI EKSPERIMETAL PENGHAMBAT PENJALARAN RETAK DENGAN MENGGUNAKAN PENGAKU Dahlan, Hendery; Dwianda, Yudi; Rusli, Meifal
Media Mesin: Majalah Teknik Mesin Vol 19, No 2 (2018)
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Salah satu penyebab retak muncul di struktur biasanya berawal pada daerah yang mengalami konsentrasi tegangan yang tinggi. Jika pembebanan terus dilakukan maka retak akan terus tumbuh dan menjalar sehingga menyebabkan terjadinya kegagalan. Oleh karena itu, diperlukan suatu cara atau metode yang efektif untuk menahan laju pertumbuhan retak sebelum kegagalan terjadi. Pada penelitian ini akan dilakukan kajian secara eksperimental pengaruh lasan, dimensi pengaku dan jumlah pengaku terhadap beban kritis sebelum retak menjalar. Dari penelitian yang telah dilakukan dapat disimpulkan bahwa pengaku yang diberikan sangat efektif mempengaruhi laju perambatan retak. Selain itu, dimensi pengaku mempengaruhi penghambatan penjalaran retak dimana semakin besar dimensi pengaku maka rata rata beban kritis yang dibutuhkan untuk retak mulai menjalar semakin besar. Sementara itu kualitaspengelasan pada retak sangat mempengaruhi penghambatan retak untuk menjalar.
Experimental Study of Crack Growth Arrest Using Stop-Drilled Hole (SDH) with Pre-Stress Yudi Dwianda; Tulus Swasono
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 64 No 1 (2020): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (382.393 KB) | DOI: 10.36842/jomase.v64i1.153

Abstract

When critical cracks are detected, the choice of one or a combination of repair techniques to be used depends on many factors, such as crack conditions, expected precision, type of material, availability of tools and experience required. One method is to make Stop-Drilled Hole (SDH) at the ends of the crack. This research examines crack growth arrest in the form of Stop-Drilled Hole. Variation was given the initial stress (Pre-Stress) with a combination of variations in the size of the SDH. This combination has a varied effect on the average critical load that can be held before cracking propagates. In this study, it was found that the greater the dimensions of the SDH, the average critical load needed to re-propagate the crack also increases. It was also found that the initial stress applied to the SDH would raise the average value of the critical load.
KAJI EKSPERIMETAL PENGHAMBAT PENJALARAN RETAK DENGAN MENGGUNAKAN PENGAKU Hendery Dahlan; Yudi Dwianda; Meifal Rusli
Media Mesin: Majalah Teknik Mesin Vol 19, No 2 (2018)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v19i2.7498

Abstract

Salah satu penyebab retak muncul di struktur biasanya berawal pada daerah yang mengalami konsentrasi tegangan yang tinggi. Jika pembebanan terus dilakukan maka retak akan terus tumbuh dan menjalar sehingga menyebabkan terjadinya kegagalan. Oleh karena itu, diperlukan suatu cara atau metode yang efektif untuk menahan laju pertumbuhan retak sebelum kegagalan terjadi. Pada penelitian ini akan dilakukan kajian secara eksperimental pengaruh lasan, dimensi pengaku dan jumlah pengaku terhadap beban kritis sebelum retak menjalar. Dari penelitian yang telah dilakukan dapat disimpulkan bahwa pengaku yang diberikan sangat efektif mempengaruhi laju perambatan retak. Selain itu, dimensi pengaku mempengaruhi penghambatan penjalaran retak dimana semakin besar dimensi pengaku maka rata rata beban kritis yang dibutuhkan untuk retak mulai menjalar semakin besar. Sementara itu kualitaspengelasan pada retak sangat mempengaruhi penghambatan retak untuk menjalar.
The Effect of Misalignment to Vibration, Electric Current and Shaft Rotation Speed on Gear Transmission Romiyadi Nawir; Yudi Dwianda; Adi Febrianton; Purnama Irwan
Journal of Ocean, Mechanical and Aerospace -science and engineering- Vol 66 No 1 (2022): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Publisher : International Society of Ocean, Mechanical and Aerospace -scientists and engineers- (ISOMAse)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (791.346 KB) | DOI: 10.36842/jomase.v66i1.278

Abstract

Gear is a rotating machine that is widely used as a power transfer transmission in many industries. Gear has a long life times. However, the gears can be damaged due to many factors such as out of the maintenance, which one factor of misalignment. This study aim is to determine the effect of misalignment on the gear transmission to vibration, electric current and shaft rotation speed. In this study, was done alignment process with variations of misalignment on the gear transmission alignment kit and was done measurement value of vibration, electric current and shaft rotation speed. The study results show the greater the misalignment, the greater the vibration that occurs either radially or axially for all conditions measured. The shaft rotation was slower with the greater misalignment. The misalignment can affect the decrease in the rotation speed of the shaft. Therefore, it can reduce the efficiency for power transmission of engine.
Design and Manufacturing of Soybean Epidermis Peeler Machine Romiyadi Romiyadi; Yudi Dwianda
Jurnal Teknik Mesin Vol 9 No 1 (2019): Jurnal Teknik Mesin Vol.9 No.1 April 2019
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2019.v9.i1.36-40

Abstract

The soybean epidermis peeler machine was a machine used to peel of soybean epidermis from the soybean. The purpose of the study was to design and manufacture of soybean epidermis peeler machine with a capacity of 3 kg for a process. In this study, the soybean epidermis peeler machine was designed and manufactured with uses 2 shaft to peel the soybean epidermis from the soybean. From the process of designing and manufacturing, has produced a soybean epidermis peeler machine with a capacity of 3 kg for a process. The machine uses a electric motor with a power of 0.5 HP. The transmission system uses pulley transmission between electric motor with 1st shaft and uses sprocket and gear transmission between 1st shaft and 2nd shaft.