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ITS » Master Theses » Disain Sistem Mekanikal
Posted by dewi007 at 14/08/2009 11:33:36  •  3753 Views

KOMPARASI TEORITIS-EKSPERIMEN BATAS LELAH BAJA AISI 1045 PADA PEMBEBANAN LENTUR PUTAR DENGAN VARIASI KEKASARAN PERMUKAAN

COMPARISON OF THEORITICAL-EXPERIMENTAL FATIGUE LIMIT OF STEEL AISI 1045 EXERTED BY ROTATING BENDING LOAD WITH VARIATION OF SURFACE ROUGHNEES

Created by :
Susanto, Yosep Ardi Ang ( 2106205005 )



SubjectPermesinan
Alt. Subject Fatigue esting machiness
Material -- Fatigue
Keywordkekasaran permukaan
tegangan
siklus
batas lelah
pola patahan
dan sifat patahan

[ Description ]

Poros merupakan komponen yang sangat penting dalam konstruksi mesin, karena berfungsi untuk meneruskan daya dan putaran. Oleh karena itu poros hendaknya didesain agar mampu menahan beban dan berumur panjang. Banyak faktor yang mempengaruhi batas lelah suatu material, salah satunya adalah kekasaran permukaan. Penelitian ini bertujuan untuk mendapatkan pengaruh kekasaran permukaan terhadap batas lelah, mendapatkan pola patahan, jenis patahan, dan sifat patahan baja poros AISI 1045. Pengujian utama dalam penelitian ini adalah uji lelah khususnya pengujian lentur putar. Untuk mendukung pengujian utama diperlukan pengujian pendukung yaitu uji tarik, pengukuran kekasaran permukaan dan pengamatan permukaan patahan dengan mikroskop optik dan Scanning Electron Microscope. Eksperimen dilakukan pada tiga variasi kekasaran permukaan yaitu: kekasaran tinggi (Rz = 28 μ m); kekasaran medium (Rz = 12 μ m); kekasaran rendah (Rz = 4 μ m) dan tiga level tegangan yaitu: σ = 231 .654 Mpa (0.342 σu); σ =260.628 Mpa (0.385 σU ); dan σ =289.592 MPa(0.427 σu). Hasil eksperimen menunjukkan bahwa baja poros AISI 1045 tersebut mempunyai batas lelah yang berbeda-beda. Semakin tinggi angka kekasaran permukaan (Rz), maka semakin rendah batas lelah material tersebut. Masing– masing batas lelah pada setiap variasi kekasaran permukaan adalah sebagai berikut: kekasaran tinggi (Rz = 28 μ m), batas lelah = 241.454 Mpa (0.356 σu); kekasaran sedang (Rz = 12 μm), batas lelah = 256.4 Mpa (0.378 σu) atau sekitar 6.17% lebih tinggi dari batas lelah dengan kekasaran tinggi; dan kekasaran rendah (Rz = 4 μ m), batas lelahnya adalah = 260.03 Mpa (0.384 σu) atau sekitar 7.86 % lebih tinggi dari batas lelah spesimen kekasaran tinggi. Sedangkan dari pengamatan pola patahan, gagalnya material diakibatkan oleh beban lentur murni dan sifat patahan digolongkan sebagai patah ulet.


Alt. Description

Shaft is an important component in machine construction, because its function is to continue both power and rotation. Therefore shaft shall be designed to be able to support loads and to be long life. There are many factors influencing fatigue limits in particular material. One of them is surface roughness. The goals of this research are to get surface roughness influence to fatigue limit, surface fracture pattern, type of fracture, and fracture surface characteristic of AISI 1045. The main test in this research is fatigue test especially rotary bending fatigue test. To support the main test is required other tests such as: tensile test, measurement of surface roughness and surface fracture observation with optical microscope and Scanning Electron Microscope. Experiment is done at three levels of surface roughness those are: coarse surface (Rz = 28 μ m); medium surface (Rz = 12 μ m); and fine surface ( Rz = 4 μ m) and three levels of stress: σ = 231 . 654 MPa (0.342 σu ); σ = 260.628 MPa (0.385 σu ); σ = 289.592 MPa (0.427 σu). Experiment indicates that steel shaft AISI 1045 has different fatigue limit. Increasing the surface roughness number, lowering the fatigue limit of material. Each fatigue limit in each various surface roughness are as follow: coarse surface ( Rz = 28 μ m), fatigue limit = 241.454 MPa (0.356 σu ); medium surface ( Rz = 12 μm), fatigue limit = 256.4 MPa ( 0378 σu ) or around higher 6.17% than fatigue limit with coarse surface; and fine surface( Rz = 4 μ m), fatigue limit = 260.03 MPa ( 0.384 σu) or around 7.86 higher % than fatigue limit of coarse surface. While from surface fracture observation, failure of material only caused by pure bending load and surface fracture characteristic classified as ductile fracture.

Contributor:
  1. Dr.Ir. Soeharto, DEA
    Ir. Yusuf Kaelani, MSc.E
Date Create:14/08/2009
Type:Text
Format:pdf.
Language:Indonesian
Identifier:ITS-master-3100009035230
Collection ID:3100009035230
Call Number:RTM 620.112 6 Sus k


Source :
Master Theses of Mechanical Engineering, RTM 620.112 6 Sus k, 2009

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batas , batas lelah , dan , dan sifat patahan , kekasaran , kekasaran permukaan , lelah , patahan , permukaan , pola , pola patahan , sifat , siklus , tegangan




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