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Sahlan Sahlan
Sekolah Tinggi Teknik PLN
Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering

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Pengaruh Gaya Siklis Aksial-Torsial pada Model Simulasi Sambungan Pipa Apung Menurut Teori Gaya Dua Permukaan Sahlan Sahlan
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v17i2.423

Abstract

The two-surface theory consists of a yield surface and a loading surface, in which the surface may be defined diffrerently (axial and torsional). A Simulation experimental study on the inelastic behavior of tubular annealed alluminum alloy Alumina Duroll tubular specimens subjected to combined axial and torsional stress cycles is presented. Particular attention is paid to the question of how plastic strain is developed and how the yield surface moves along the 90o out-of-phase stress cycle for simulation model of floating hose. Experimental result agree qualitatively with the prediction of the two surface plasticity theory. This Research is based on case study research pipeline buoyancy (floating hoses)
Analisis Cacat Las Incomplete Fusion Dan Retak Memanjang Pada Waterwall Tube Boiler PLTU Paiton Unit 1 Sahlan Sahlan
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/st.v18i1.701

Abstract

Weld defects in the form of "incomplete fusion" and lengthwise (longitudinal) crackswas observed at the boiler tube welding of steam power plants of Paiton Unit 1, row 3, located860 mm above theheader, .Incomplete fusionmay be caused by incorrect use of the the magnitude of current,welding speed, or manipulation or selection of the electrode being used, thatmay lead tounevenfusityand affect generate the cracks along the incomplete fusion region. Incomplete fusion defects in the waterwall tubes welding being visible from the edge of the boundary between the base material and weld region with the presence of indentation or depression in the form of a very deep crater welding. Indentations or hollows, that will be observed more clearly by using an optical microscope with a magnification 1000X, which in the presence of imperfections observed molecular fusion between grain boundaries and inter-molecular crystal. At 1000X magnification ofthe HAZ (heat affected zone) region,transition structure forming brittle fractures was observed 
MODEL SIMULASI UNTUK MENGAMATI PENGARUH TEGANGAN TARIK-SISA SILINDER AUTOFRETTAGE LARAS SENAPAN Sahlan Sahlan
Energi & Kelistrikan Vol 7 No 1 (2015): Energi & Kelistrikan
Publisher : Sekolah Tinggi Teknik PLN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (920.027 KB) | DOI: 10.33322/energi.v7i1.586

Abstract

The analysis of autofrettage on fatigue-crack propagation of crack are well documented, that is experimental work shows the effects of positive stress ratio or tensile-minimum stress during thefatigue cycles on the fatigue-crack inition from holes. This simulates model the effect of the residual-tensile stresses at the outside surface of autofrettage cylinders. S-N curves and modifiedGoodman diagrams are shown for fatigue-crack inition. This allows a tremendous advantage in retarding crack initiation and propagation in the early stages of crack growth, wich accounts for thedramatic increases in useful service life for an autofrettage cylinder compared to a nonautofrettaged cylinder.
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