Garuda - Garba Rujukan Digital

Distribusi dan Interaksi Tegangan Sisa antar Lubang Setelah Proses Cold Expansion Hole Wahjudi, Ari; Purnowidodo, Anindito; P, Andika H
Jurnal Rekayasa Mesin Vol 3, No 3 (2012)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (409.404 KB)

It is well known that the main cause of a failure of structure is initiated by cracks on a member. A crack may originate easily in a region with high stress concentration. Because in the rivet and the bolt joining method are usual with number of holes, and to reduce the stress concentration, the compressive residual stress is introduced in the region near by the hole. The cold expansion hole technique is used to developed compressive residual on the vicinity of the edge hole. The present study was carried out by the computer simulation based on finite element method to investigate the distribution and interaction residual stress in the region between holes related to the cold expansion hole. The result of the study suggests that the distance between holes influence the state of residual stress and its magnitude. These cause by the deformed material between holes interact each other.Keywords: residual stress distribution, stress interaction, region between holes

Hubungan Diameter Pasak, Lubang Sambungan Dan Ketebalan Plat Terhadap Distribusi Tegangan Sisa Wahjudi, Ari; Purnowidodo, Anindito; Pambudi, Wijil
Rekayasa Mesin Vol 2, No 3 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.524 KB)

The discontinuities on the structures or members are often to be encountered such as, rivet and bolt holes as well as notches. These discontinuities are agents for stress raiser and itcan initiate cracks in the vicinity of holes or in the notch roots. It is well known that most of the fatigue failure is caused by cracks growth initiated from the discontinuities. To reduce possibilitythe initiation of crack in those stress raisers, the compressive residual stress, in general, is imposed to the region in which the stress concentrates. In the present study, using expansionhole technique carried out by aid of computer simulation, the effect of mandrel diameter and thickness of the blank to the residual stress in the vicinity of the hole is investigated. The result shows that the magnitude of the residual stress in the vicinity of the hole varies depending onthe magnitude of the expansion and the thickness of blank. In addition, in the certain distancefrom the hole, the tensile residual stress develops, hence, it may endanger a component because it causes the crack growth rate increase, as consequent, the life time of a componentis shorter.Keyword: mandrell diameter, hole diameter, thickness, residual stress distribution

Analisa Kegagalan pada Spindle Mesin Batch Centrifugal Purnowidodo, Anindito; Wahjudi, Ari; Prawira, Riza
Jurnal Rekayasa Mesin Vol 2, No 1 (2011)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.242 KB)

Failure analysis was conducted on the failure shaft of batch centrifugal. In the analysis the stress analysis was used to know the stress distribution, and in conjuction with stress analysis the life time of the component can be estimated. In addition, the fractography anlaysis together with mechanical properties test were carried out to understand the mechanism of the failure. With respect to the result of analysis shows that the failure was caused by fatigue crack initated on the surface of shaft due to the inhomogeneus mechanical properties, in this case, the hardness is lower than that on sub surface of the shaft. Besides that, the stress concentration was found take place on the surface of shaft on which the crack was initated. Further, it was known that during machining process, the material of shaft was heated on elevated temperature on the surface to ease the process. The heating reduced the hardness as well as the strength of the material.Keywords : Failure, Fatigue, Crack.

PENGARUH MODE GETAR DAN ASPEK RASIO TERHADAP DISTRIBUSI TEGANGAN PADA FIBER METAL LAMINATES Khairul Anam; Anindito Purnowidodo; Tamara F. Utama; Djarot B. Darmadi; Ari Wahjudi; Agung Sugeng Widodo
Jurnal Rekayasa Mesin Vol. 13 No. 2 (2022)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v13i2.817

Fiber metal laminates (FMLs) are widely used in various fields such as automotive and aerospace due to their high stiffness and strength-to-weight ratios. Moreover, they also have high fatigue resistance. In some applications such as aircraft structures, it is crucial to do dynamic analysis of the FMLs structure. FMLs compose of aluminium and fiberglass reinforced polymers (FRPs) are used in this study. The aim of this study is to investigate the effect of shape mode and aspect ratio on the stress distribution of FML by using finite element analysis software. Ten initial mode shapes and the aspect ratio of 1:1.5, 1:2, and 1:2.5 are used as the environmental conditions of the FMLs. The results indicate that the mode shape will change the stress distribution and the maximum stress position. Besides, the results have shown that a wider FMLs plate will increase the maximum stress and deformation. The maximum to minimum stress distribution occurs on the outer aluminium surface, the inner aluminium surface, and the FRPs surface, respectively.

A COMPREHENSIVE REVIEW ON THE NON-DESTRUCTIVE TEST FOR POLYMER MATRIX COMPOSITE Wahjudi, Ari; Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1681

Polymer matrix composite (PMC) is widely applied in structural engineering mainly due to its high strength-to-weight ratio. Of many benefits, the transportation industry uses this type of material mainly due to its high strength-to-weight ratio. In many cases, this strength-to-weight ratio is higher than aluminum or steel base materials. Its manufacturing and fabrication, however, are challenging. For this reason, destructive and non-destructive tests to control product quality during the manufacturing process are worked out. The non-destructive test delivers many benefits since the finished product does not. This paper discusses the benefits of polymer matrix composite application in the structural engineering. In addition, this work also outlined the key parameters and comparison of various non-destructive tests applied for the PMC.

Desain Kawasan Sapi Perah untuk Menopang Wisata Desa Lembah Mbencirang di Desa Kebontunggul Widodo, Teguh Dwi; Budiarto, Agus; Wahjudi, Ari; Maftuch, Maftuch; Asmaranto, Runi; Raharjo, Rudianto; Sugiarto, Sugiarto; Bintarto, Redi
Jurnal Pengabdian pada Masyarakat Ilmu Pengetahuan dan Teknologi Terintegrasi Vol. 7 No. 2 (2023): June
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jindeks.v7i2.389

Ketahanan pangan merupakan program yang telah di canangkan oleh pemerintah. Dalam pelaksanaanya pembuatan wilayah dengan ketahanan dapat diintegrasikan dengan wilayah penopang ekonomi lainnya seperti daerah wisata sehingga akan didapat sentra Ekonomi yang mampu dijadikan sebagai sumber penghasilan warga setempat. Desa Kebontunggul merupakan desa yang ada di Kecamatan Gondang Kabupaten Mojokerto. Melalu program Matching Fund Kedaireka yang didanai oleh Kementerian Pendidikan, Kebudayaan, Riset, dan Teknologi Universitas Brawijaya mengadakan program hilirisasi Teknologi berupa pengembangan Kawasan Peternakan sapi perahyang diintegrasikan dengan Kawasan wisata yang ada di daerah setempat yaitu Lembah Mbendcirang yang sebelumnya sudah beroprasi. Tim Matching Fund Universitas Brawijaya mengadakan pemetaan wilayah di desa Kebontunggul terkait potensi lokasi sapi perah, sumberdaya paka, serta akses lokasi integrasi dengan lembah mbencirang. Selanjutnya dengan bantuan drone dan satelit Map Tim Martching Fund Universitas Brawijaya Melakukan pembuatan Materplan dimana dalam pembuatannya juga melibatkan masyarakat setempat sehingga sesuai dengan harapan masyarakat namun tetap memegang aspek Teknolologi yang dikembangkan oleh Universitas Brawiajaya. Selin itu juga dilakukan pelatihan budidaya sapi perah yang dilakukan oleh Tim Matching fund 2022 Universitas Brawijaya

SPATIAL AND TEMPORAL POTENTIAL OF CURRENT ENERGY AND WAVE HEIGHT IN INDONESIAN SEA Alamsah, Azwar; Wahjudi, Ari; Moon, Park Jae; Hamidi, Nurkholis; Widhiyanuriyawan, Denny
International Journal of Mechanical Engineering Technologies and Applications Vol. 6 No. 2 (2025)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2025.006.02.8

The energy demand in Indonesia continues to rise, with a primary reliance on fossil fuels, leading to environmental issues such as increased CO2 emissions. To address these challenges, the exploration of renewable energy, particularly from wave and ocean current sources, becomes crucial. This research analyzes the energy potential generated from waves and ocean currents throughout Indonesia using the WAVEWATCH-III method for modeling marine data over a 10-year period. The results indicate that the energy potential from ocean currents ranges between 120-150 kW, with strategic locations around straits such as the Makassar Strait and the Java Sea. Meanwhile, the potential energy from ocean waves reaches approximately 2.5 GW over a three-month period, thanks to Indonesia's extensive coastline of 99,093 km. Spatial and temporal analyses reveal significant variations in Sea Level Anomaly (SLA) values, which can be utilized for the development of renewable energy projects. The conclusion of this research emphasizes the need for a deeper understanding of the dynamics of ocean currents and waves to maximize the utilization of renewable energy potential in Indonesia.

Potensi Energi Arus dan Tinggi Gelombang Laut Indonesia Berdasarkan Data Penginderaan Jauh Alamsah, Azwar; Wahjudi, Ari; Moon, Park Jae; Hamidi, Nurkholis; Widhiyanuriyawan, Denny
TECHNO-SOCIO EKONOMIKA Vol 18 No 1 (2025): Jurnal Techno-Socio Ekonomika - April
Publisher : LPPM Universitas Sangga Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32897/techno.2025.18.1.4087

Indonesia's energy demand continues to increase, with a primary reliance on fossil fuels that contribute to environmental issues, such as rising CO₂ emissions. To address this challenge, this study explores the potential of renewable energy from wave and ocean current sources. The research process analyzes the energy potential generated from waves and ocean currents across Indonesian waters using the WAVEWATCH-III method to model ocean data over a 10-year period, focusing on energy potential at strategic locations in Indonesian waters. The results show that the energy potential from ocean currents ranges between 120–150 kW, with strategic locations around straits, such as the Makassar Strait and the Java Sea. Meanwhile, the wave energy potential reaches approximately 2.5 GW over a three-month period, thanks to Indonesia’s extensive coastline of 99,093 km. Spatial and temporal analyses reveal significant variations in Sea Level Anomaly (SLA) values, which can be utilized for the development of renewable energy projects. The conclusion of this study emphasizes the need for a deeper understanding of ocean current and wave dynamics to maximize the utilization of renewable energy potential in Indonesia. Spatial and temporal analyses show significant variations in SLA values across Indonesia, reflecting the dynamics of ocean currents. Understanding these changes is crucial for planning adaptive ocean current energy projects, and seasonal trend analysis can help optimize the use of ocean current patterns.

Optimizing Aluminium 6061 Turning using Kesambi Oil-Based Cutting Fluid and Response Surface Methodology to Reduce Surface Roughness Wahjudi, Ari; Baihaki, Raihan; Anam, Khairul
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p305

This study investigates the viability of Kesambi oil (Schleichera oleosa) as an environmentally sustainable, bio-based cutting fluid to reduce surface roughness during the turning of Aluminium 6061. The study employs Response Surface Methodology in conjunction with a Central Composite Design to identify the optimal parameter combination between two primary variables, including the composition of Kesambi oil and the depth of cut during machining. The best configuration, comprising 19.57% Kesambi oil and a cutting depth of 0.99 mm, yielded a surface roughness of 3.61 µm, closely matching the predicted value of 3.59 µm. A Fourier Transform Infrared Spectroscopy was conducted to indicate the presence of a thin lubricating film on the surface. This film can reduce the friction and enhance the high surface quality. Generally, the results show that Kesambi oil is effective and sustainable compared to conventional petroleum-based cutting fluids.

A COMPREHENSIVE REVIEW ON THE NON-DESTRUCTIVE TEST FOR POLYMER MATRIX COMPOSITE Wahjudi, Ari; Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1681

Polymer matrix composite (PMC) is widely applied in structural engineering mainly due to its high strength-to-weight ratio. Of many benefits, the transportation industry uses this type of material mainly due to its high strength-to-weight ratio. In many cases, this strength-to-weight ratio is higher than aluminum or steel base materials. Its manufacturing and fabrication, however, are challenging. For this reason, destructive and non-destructive tests to control product quality during the manufacturing process are worked out. The non-destructive test delivers many benefits since the finished product does not. This paper discusses the benefits of polymer matrix composite application in the structural engineering. In addition, this work also outlined the key parameters and comparison of various non-destructive tests applied for the PMC.

Title

Found 10 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 10 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 10 Documents
Search