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Sugeng Tirta Atmaja
Department of Mechanical Engineering, Faculty of Engineering, Diponegoro University
Mechanical Engineering

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DISTRIBUSI TEKANAN AKIBAT EFEK SECONDARY FLOW DAN SEPARASI PADA INNER WALL DARI RECTANGULAR ELBOW Atmaja, Sugeng Tirta; Rozi, Khoiri
ROTASI VOLUME 13, NOMOR 3, JULI 2011
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.574 KB) | DOI: 10.14710/rotasi.13.3.9-12

Abstract

Studi ini dibuat untuk menguji karakteristik aliran yang melewati elbow. Hasil-hasil pengukuran tekanan statis pada daerah inner surface menunjukkan bahwa aliran pada sisi upstream mengalami akselerasi secara gradual dan kemudian melewati convex wall/suction side, kondisi aliran dipercepat secara tajam sampai di Ó¨ = 45o. Kondisi aliran menuju downstream saluran menunjukkan bahwa aliran diperlambat secara gradual sampai pada exit saluran di x/L = 1,0 dimana aliran mengalami separasi.
THE EFFECT OF ALLOY ELEMENTS ON FATIGUE STRENGTH OF GRAY CAST IRON AT ROOM AND HIGH TEMPERATURE Sulardjaka, Sulardjaka; Atmaja, Sugeng Tirta; Nugroho, Sri; Adnan, F; Cahyono, A. D.
ROTASI Vol 15, No 1 (2013): VOLUME 15, NOMOR 1, JANUARI 2013
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (362.857 KB) | DOI: 10.14710/rotasi.15.1.23-28

Abstract

Gray cast iron is quite poor in terms of fatigue resistance due to its typical microstructure of distributed graphite lamellas in a pearlite matrix. The objective of this research to improve mechanical properties and fatigue strength gray cast iron (GCI) at high temperature by adding the alloy elements such as: nickel (Ni), molybdenum (Mo), copper (Cu) and chromium (Cr). The mechanical characterization that has been done is tensile test and hardness tesst. The tensile test was conducted based on ASTM E8 standard. The hardess test of GCI was test by Brinell Hardness Test methods based on ASTM E10. Fatigue test was performed on continuous radius fatigue specimens based on JIS Z 2774 standard with cyclic loading frequency of 50 Hz and load ratio R = -1. The fatigue test has been done at room temperature and at temperature 300oC. The results of this experiments show that alloy elements such as : nickel (Ni), molybdenum (Mo), copper (Cu) and chromium (Cr) increase the hardness and tensile strength of Gray cast iron. Nickel results finer graphite grain and improve fatigue strength of Gray cast iron at high temperature.
EFEK SECONDARY FLOW DAN SEPARASI TERHADAP POLA DISTRIBUSI TEKANAN PADA OUTER WALL DARI RECTANGULAR ELBOW Rozi, Khoiri; Atmaja, Sugeng Tirta
ROTASI VOLUME 13, NOMOR 2, APRIL 2011
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (272.34 KB) | DOI: 10.14710/rotasi.13.2.18-21

Abstract

Studi ini secara umum dibuat untuk menguji karakteristik aliran melewati outer wall dari elbow. Hasil-hasil pengukuran tekanan statis pada outer surface ditemukan bahwa aliran mula-mula mengalami deselerasi melewati concave wall/pressure side sampai di Ó¨ = 45o dan kemudian menuju downstream aliran mengalami recovery dengan penambahan kecepatan secara gradual dan sampai di x/L = 1,0 pada exit saluran aliran diprediksi mengalami terseparasi secara masive.
Co-Authors A. D. Cahyono F Adnan Khoiri Rozi Sri Nugroho Sulardjaka Sulardjaka