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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 )
| Subject: | Permesinan
| | Alt. Subject : | Fatigue esting machiness Material -- Fatigue
| | Keyword: | kekasaran 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 | : |
- 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
Coverage : ITS Community Only
Rights : Copyright @2009 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library
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