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Djoeli Satrijo
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Automotive Engineering Chemistry Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Karakterisasi Kekuatan Lelah Siklus Rendah Besi Cor Kelabu: Characterization of Low Cycle Fatigue Strength of Gray Cast Iron Agus Suprihanto; Dwi Basuki Wibowo; Djoeli Satrijo
Jurnal Metalurgi dan Material Indonesia Vol. 2 No. 3 (2019): Desember
Publisher : Badan Kerja Sama Pendidikan Metalurgi dan Material (BKPMM)

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Low cycle fatigue testing has been carried out on gray cast iron. 60 specimens made of three FC200 gray cast iron alloys with Cr (0.23%, 0.32% & 0.47% wt) and Cu (0.6% -0.7%) were tested using a servo pulse machine. Specimen dimensions refer to ASTM E739 standard. Low cycle fatigue testing used strain amplitudes between 0.15 to 0.5%. The fatigue behavior is characterized using Downing and Fash method. The analysis shows that the coefficient of fatigue strength (A) is between 2.336 –2.896 and the exponent of fatigue strength is between -0.251 to –0.266.
OPTIMASI PELAPISAN MATERIAL VISKOELASTIK I Wayan Suweca; Bagus Budiwantoro; Gatot Santoso; Djoeli Satrijo
Mesin Vol. 11 No. 1 (1996)
Publisher : Mesin

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Dalam tulisan ini dibahas suatu penerapan dari metode optimasi untuk mendapatkan redaman struktur melalui pelapisan material viskoelastik secara optimal. Algoritme optimasi yang digunakan didasarkan pada metode kriteria optimalitas (optimality criteria) dari Kuhn-Tucker, di mana berat total struktur di ambil sebagai fungsi objektif dengan kendala dinamik berupa redaman struktur. Model redaman yang digunakan adalah redaman jenis histeritik. Gradien fungsi kendala terhadap disain variabel dihitung dengan menggunakan perhitungan sensitivitasdengan variabel kompleks. Sebagai contoh numerik diberikan satu kasus optimasi pelapisan material viskoelastik pada suatu beam Euler-Bernoulli.
Co-Authors Agus Suprihanto Bagus Budiwantoro Dwi Basuki Wibowo I Wayan Suweca Ir. Gatot Santoso