Analisisfatigue Failure Suhu Rendah Struktur Batang Duralumindengan Mesin Siklus Bending

Tawaf, Nanang (2015) Analisisfatigue Failure Suhu Rendah Struktur Batang Duralumindengan Mesin Siklus Bending. Magister thesis, Universitas Brawijaya.

Abstract

Penggunaanbahanlogam non-ferrous sepertipaduanaluminiumdengankarakteristik yang spesifikseperti strength to density ratio (kekuatan/beratjenis) yang tinggidantahanterhadappengaruhlingkungan.Aluminiumdanaluminiumpaduansangatbanyakdite ukandandigunakandalamindustripesawatterbang.Akhir akhirinipaduanaluminiumsemakinbanyakdigunakandalamsistem cryogenic terutamaaplikasidalamindustriminyak, material bejana yang beroperasipadatemperaturrendah ( cryogenic vessel ), danindustriotomotif.Dalamaplikasi diperkirakan 50% - 90% kegagalanmekanisdisebabkanolehkegagalanlelah (fatigue failure). Padapenelitianini, untukmemprediksiketahananlelah duralumin suhurendahdanmengetahui pengaruhstrukturmikroterhadapketahananlelah duralumin padasuhurendah . P enelitianinimenggunakantegangansebesar 15 MPa, 30 MPa, dan 45 MPadenganmesinsiklusbending. Material ujiadalah duralumin (paduan Al-Cu) yang telahdilakukanpengujianporositas, fatigue suhurendah(-19 o C) dansuhuruang (27 o C), ikrostruktur, raktografi, sertamakrostruktur. Hasilpenelitianmenunjukkanbahwakekuatanlelahduralumin adasuhurendahlebihbesardaripadakekuatanlelah duralumin suhuruang.Padasikluspatah13 x 10 5 duralumin suhu-19 o Cmemilikikekuatanlelahsebesar 33MPa, sedangkankekuatanlelah duralumin suhu27 o Csebesar 15MPa. Strukturmikro material ujisuhurendahmenunjukkanbutir yang memanjang,kecildanhalus.Initerjadikarena proses deformasipadapengujian fatigue suhurendah, material ujidenganbutiranlebihkecilmempunyaihambatan slip yang lebihbesar. Sehinggame . nyebabkankekuatanlelahsuhurendahlebihbesardibandingkankekuatan lelahsuhurua g

English Abstract

re is great interest in certain industries to use non-ferrous metals, including aluminum alloy, because of ir high level of strength to density ratio and ir favorable characteristics resistance to environmental effect. Aluminum and aluminum alloy are often found and mostly used in airplane industry. Recently, aluminum alloy begins so popular in cryogenic system where it is highly applied at oil industry, low temperature operated container material ( cryogenic vessel ), and automotive industry. It is estimated that 50%-90 % mechanical failures are due to fatigue failure . This research attempts to predict duralumin fatigue resistance at low temperature and to understand effect of micro structure on duralumin fatigue resistance at low temperature. This research uses a stress of 15 MPa, 30 MPa, and 45 MPa with machine bending cycle. Test material is duralumin (Al - Cu) which has passed tests over porosity, fatigue level at low temperature (-19 0 C) and room temperature (27 0 C), microstructure, fractography, and macrostructure. Results showed that fatigue strength duralumin low temperatures greater than room temperature fatigue strength duralumin. In broken cycle of 13 x 10 5 duralumin temperature -19 0 C have fatigue strength at 33MPa, while fatigue strength duralumin 27 0 C at 15MPa. Microstructure of material low temperature test showed elongated, small and smooth grains. This occurs because process of deformation at low temperature fatigue testing. Test materials with smaller grains have larger slips barriers. Causing fatigue strength low temperatures greater than room temperature fatigue strength.

Item Type: Thesis (Magister)
Identification Number: TES/620.112 6/TAW/a/2015/041501281
Subjects: 600 Technology (Applied sciences) > 620 Engineering and allied operations > 620.1 Engineering mechanics and materials
Divisions: S2/S3 > Magister Teknik Mesin, Fakultas Teknik
Depositing User: Sugiantoro
Date Deposited: 11 May 2015 09:23
Last Modified: 11 May 2015 09:23
URI: http://repository.ub.ac.id/id/eprint/158592
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