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Djarot B Darmadi
Staf pengajar jurusan teknik mesin FT-UNDIP
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Tensile Strength Of Round Bar A 6061 Friction Weld Joint Influenced By Changes Room Temperature Kido, Muhammad Ikram; Sugiarto, Sugiarto; Darmadi, Djarot B
SENATIK STT Adisutjipto Vol 5 (2019): Peran Teknologi untuk Revitalisasi Bandara dan Transportasi Udara [ISBN XXX-XXX-XXXXX-
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/senatik.v5i0.346

Abstract

Aluminum alloy is non-Ferro material that very difficult to amalgamate using fusion welding, so it requires friction method. Friction welding is process for connecting metals without melting (solid state process), Process merging between the rotating speeds of material forces cause heat friction and at somepoint can be able to melt the materials and melting process occurs. The study aim is to determine tensile strength results from friction weld joints due to changes in ambient temperature of room. Material test is Aluminum A6061. Friction welding uses a lathe with rotation speed of 1600 rpm. The length size of material is 80 mm and 120 mm, diameter 15 mm, Champer angle 15°, 65 bar friction force for 60 seconds, final compressive force 375 bar for 60 seconds and variations in ambient temperature namely room temperature (T0),125 °C,150°C. The A 6061 joint produces the highest tensile strength at temperature 150 oC (188 MPa).
PENGARUH ZALIR DAN PUTARAN KATUP TERHADAP UNJUK KERJA PEREDAM VISKOUS Darmadi, Djarot B; Haryadi, Gunawan Dwi
ROTASI Volume 3, Nomor 2, April 2001
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (154.028 KB) | DOI: 10.14710/rotasi.3.2.21-27

Abstract

Fenomena getaran bebas teredam dengan getaran satu derajat kebebasan ini diuji di Laboratorium FenomenaDasar Mesin dengan memanfaatkan alat uji getaran Sanderson (Sanderson Simple Vibration Aparatus). Pengujiandilakukan dengan mengganti peredam zalir yaitu SAE 20, SAE 40 dan SAE 90, serta mengganti jumlah putaran katup(dashpot) untuk menghasilkan osilasi pada alat uji yang ditunjukkan dengan grafik gelombang sinusoidal di plotteralat uji.Data yang didapatkan berupa data amplitudo getaran terhadap waktu. Dipilih dua amplitudo X1 dan X2 yangberurutan sehingga didapatkan besaran-besaran yang mempunyai hubungan dengan fenomena getaran bebas teredamyaitu pengurangan logaritmik (), rasio peredaman () dan konstanta peredaman (c). Dengan melakukan analisa datasecara grafik dan matematik diperoleh kesimpulan semakin besar putaran katup memberikan efek peredaman yangmenurun dan peredam zalir yang memberikan efek peredaman dari yang terbesar secara berturut-turut SAE 40, SAE90 dan SAE 20.
Pengaruh Kecepatan Pengadukan pada Proses Stircasting terhadap Sifat Mekanik pada Paduan Aluminium Jauhari, Mochamad Helmi; Darmadi, Djarot B; Widodo, Teguh Dwi
Jurnal Rekayasa Mesin Vol 12, No 1 (2021)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2021.012.01.5

Abstract

The composite material is a material composed of a mixture or combination of two or more of the major elements that macro differ in shape and material composition that basically can not be separated. In this research, the aluminum used was the outcome of production cesspool with the addition of volcanic dust from Mount Kelud by 2% as reinforcement. The stir casting process is the casting process by adding a material (powder form) in pure metal (aluminum), which has been melted and then stirring constantly. After that, the composite materials (the volcanic dust from Mount Kelud) were mixed slowly into the stirred liquid material. In this research, the variations of stirring speed were 0,200,300,400,500  and 600 rpm. The stirring each time for 4 minutes. In this study, the stirring speed in the casting process was 0, 200, 300, 400, 500, and 600 rpm. Tensile test, Impact test, and microstructure observations were carried out on the casting results. From these tests, the highest modulus of elasticity and impact value was obtained at the 600rpm stirring process. It may due to globular grains are more evenly distributed. And the result of metallographic testing was stirring speed could affect the amount and density of composite grain structure. The faster the stirring, the grain structure was getting smaller and close.
Co-Authors Gunawan Dwi Haryadi Jauhari, Mochamad Helmi Muhammad Ikram Kido Sugiarto S Teguh Dwi Widodo