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<http://digilib.unila.ac.id/id/eprint/83706> <http://purl.org/dc/terms/title> "KARAKTERISTIK PERAMBATAN RETAK FATIK PIPA BAJA TYPE\r\n\r\nAPI 5L PSL -1 GRADE B\r\n"^^<http://www.w3.org/2001/XMLSchema#string> .
<http://digilib.unila.ac.id/id/eprint/83706> <http://purl.org/ontology/bibo/abstract> "Pipa baja API 5L Grade B merupakan pipa yang digunakan dalam\r\ntransportasi minyak bumi dan gas alam. Tujuan dari penelitian ini adalah\r\nuntuk mengetahui karakteristik perambatan retak fatik pada material pipa\r\nbaja API 5L-B. Uji tarik (ASTM 8) dan uji perambatan retak fatik (ASTM\r\nE647) menggunakan spesimen Compact Tension (CT). Parameter pengujian\r\nyang digunakan dalam penelitian ini yaitu Pmax = 3,566 kN, Pmin = 0,357 kN,\r\nσyield = 399.251 MPa dan f = 10 Hz. Pengukuran panjang retak\r\nmenggunakan metode compliance serta data panjang retak dan jumlah siklus\r\ndianalisis menggunakan metode polynomial incremental untuk menentukan\r\nlaju perambatan retak fatik (da/dN) dan faktor intensitas tegangan (ΔK).\r\nPlot data da/dN vs ΔK dilakukan untuk menentukan koefisien persamaan\r\nParis pada daerah perambatan retak stabil-stage II. Nilai konstanta m =\r\n3,607 dan nilai konstanta C = 1,176x10-12\r\n\r\n. Pengamatan mikrostruktur\r\nmaterial menggunakan mikroskop optik menunjukkan fasa ferit dan perlit.\r\nPengamatan SEM pada permukaan patahan menunjukkan pola patahan\r\nintergranular. Selain itu, permukaan patahan menunjukkan adanya garis\r\nstriasi, secondary crack dan voids.\r\n\r\nKata Kunci : Pipa baja API 5L grade B, Perambatan retak fatik,\r\n\r\nMikrostruktur, Fraktografi\r\n\r\niv\r\n\r\nABSTRACT\r\n\r\nFATIGUE CRACK PROPAGATION CHARACTERISTICS OF TYPE API 5L\r\n\r\nPSL -1 GRADE B STEEL PIPE\r\n\r\nBy\r\n\r\nTRI KUSUMA WARDANI\r\n\r\nAPI 5L Grade B steel pipe is a pipe used in the transportation of petroleum\r\nand natural gas. The purpose of this study is to determine the characteristics\r\nof fatigue crack propagation in API 5L-B steel pipe material. Tensile test\r\n(ASTM 8) and fatigue crack propagation test (ASTM E647) using Compact\r\nTension (CT) specimens. The parameters used during the test were Pmax =\r\n3,566 kN, Pmin = 0,357 kN, σyield = 399.251 MPa and f = 10 Hz. Crack\r\nlength measurements using the compliance method and data on crack length\r\nand number of cycles were analyzed using the incremental polynomial\r\nmethod to determine the fatigue crack propagation rate (da/dN) and stress\r\nintensity factor (ΔK). A plot of da/dN vs ΔK data was performed to\r\ndetermine the coefficients of the Paris equation in the stable-stage II crack\r\npropagation region. The constant value m = 3,607 and the constant value\r\nC = 1,176x10-12\r\n\r\n. Microstructural observations of the material using optical\r\nmicroscopy showed ferrite and pearlite phases. SEM observation of the\r\nfracture surface showed an intergranular fracture pattern. In addition, the\r\nfracture surface showed the presence of striation lines, secondary cracks\r\nand voids.\r\n\r\nKey words : API 5L grade B steel pipe, Fatigue crack propagation,\r\n\r\nMicrostructure, Fractograf"^^<http://www.w3.org/2001/XMLSchema#string> .
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<http://digilib.unila.ac.id/id/document/2319503> <http://eprints.org/relation/isVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
<http://digilib.unila.ac.id/id/document/2319503> <http://eprints.org/relation/isVolatileVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
<http://digilib.unila.ac.id/id/document/2319503> <http://eprints.org/relation/ispreviewThumbnailVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
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<http://digilib.unila.ac.id/id/document/2319504> <http://eprints.org/relation/isVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
<http://digilib.unila.ac.id/id/document/2319504> <http://eprints.org/relation/isVolatileVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
<http://digilib.unila.ac.id/id/document/2319504> <http://eprints.org/relation/ismediumThumbnailVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
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<http://digilib.unila.ac.id/id/document/2319505> <http://eprints.org/relation/issmallThumbnailVersionOf> <http://digilib.unila.ac.id/id/document/2319475> .
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