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ITS » Undergraduate Theses » Teknik Perkapalan
Posted by sarwono@its.ac.id at 22/04/2010 15:54:53  •  3436 Views


ANALISA PENGARUH UNDERCUT TERHADAP STRESS INTENSITY FACTOR PADA PENGELASAN BUTT-JOINT PELAT ASTM A36 DENGAN METODE ELEMEN HINGGA

ANALYSIS EFFECT OF UNDERCUT ON THE STRESS INTENSITY FACTOR TO BUTT WELDED JOINT ASTM A36 PLATE USING FINITE ELEMENT METHOD

Author :
Pramono, Charisma Aji ( 4103100023 )




ABSTRAK

Metode numerik telah dikembangkan untuk memperkirakan pengaruh dari cacat undercut terhadap fatigue strength dan fatigue life pada sambungan las butt-joint. Pendekatan Linear Elastic Fracture Mechanics LEFM dan Finite Element Analysis FEA telah digunakan untuk memodelkannya. Evaluasi terhadap fatigue life dari struktur pesawat terbang kapal jembatan bangunan lepas pantai dan lain-lain adalah penting untuk memastikan keselamatan umum perlindungan lingkungan dan pertimbangan ekonomi. Suatu bencana akibat kegagalan dari struktur dapat dihindari jika tindakan pencegahan dilakukan dengan baik. Telah ditemukan bahwa efek dari geometri undercut sangat signifikan terhadap harga stress intensity factor dan laju perambatan retak pada sambungan las butt-joint. Penyelidikan pada sambungan las butt-joint pelat ASTM A36 yang dilakukan pada tebal pelat 10 15 dan 20 mm dengan variasi kedalaman undercut didapatkan bahwa setiap penambahan kedalaman undercut 3 dari tebal pelat akan mengakibatkan pertambahan intensitas tegangan pada crack front sebesar 1.7 dan peningkatan laju perambatan retak sebesar 3000 untuk tebal pelat 10 mm. Pada tebal pelat 15 mm pertambahan intensitas tegangan pada crack front sebesar 2.2 dan peningkatan laju perambatan retak sebesar 4800. Kemudian untuk pelat 20 mm didapatkan pertambahan intensitas tegangan pada crack front sebesar 2.5 dan peningkatan laju perambatan retak sebesar 7900. Pada sambungan las butt-joint di daerah weld metal dan HAZ memiliki mechanical properties yang berbeda dengan base metal. Dengan mengasumsikan weld metal dan HAZ memiliki mechanical properties dalam hal ini modulus elastisitasnya yang sama dengan base metal didapatkan bahwa kenaikan harga modulus elatisitas 10 pada weld metal dan HAZ dapat menurunkan stress intensity factor sebesar 6 dan penurunan laju perambatan retak sebesar 22.1 untuk tebal pelat 10 mm. Pada pelat dengan tebal 15 dan 20 mm terjadi penurunan stress intensity factor sebesar 5.5 dan penurunan laju perambatan retak sebesar 20.4


ABSTRACT

A numerical method is developed to predict the effect of undercut on the fatigue strength and fatigue life of butt welded joints. Linear Elastic Fracture Mechanics LEFM and Finite Element Analysis FEA approaches have been used for the modeling. Evaluation of fatigue life of structures aircraft ship railways bridges offshore structures etc. is important to ensure the public safety environmental protection and economical consideration. Catastrophic failure of any structure can be avoided if precaution is taken appropriately. It has been found that the effect of undercut geometry is significant on the stress intensity factor and crack growth rate of butt welded joints. The investigation to butt welded joints ASTM A36 plate at 10 15 and 20 mm of thickness at various undercut depth obtained that in every increasing undercut depth 3 of plate thickness the stress intensity factor on the crack front increase 1.7 and the crack growth rate increase 3000 for thickness 10 mm. For the 15 mm thickness stress intensity factor on the crack front increase 2.2 and the crack growth rate increase 4800. For 20 mm thickness is obtained that stress intensity factor on the crack front increase 2.5 and the crack growth rate increase 7900. The weld metal and HAZ area of butt welded joint have different mechanical properties with base metal. Assuming that weld metal and HAZ have mechanical properties modulus elasticity are same to base metal is obtained that the increasing 10 modulus elasticity of weld metal and HAZ will decrease 6 of stress intensity factor and crack growth rate decrease 22.1 for thickness 10 mm. On the 15 and 20 mm plate thickness stress intensity factor decrease 5.5 and crack growth rate decrease 20.4.



Keywordsundercut; stress intensity factor; laju perambatan retak
 
Subject:  Pengelasan
Contributor
  1. Totok Yulianto, S.T., M.T.
Date Create: 22/04/2010
Type: Text
Format: pdf
Language: Indonesian
Identifier: ITS-Undergraduate-3100010038696
Collection ID: 3100010038696
Call Number: RSKe 671.52 Pra a


Source
Undergraduate theses, Naval Architecture and Shipbuilding RSKe 671.52 Pra a, 2009

Coverage
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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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  1.  ITS-Undergraduate-9462-4103100023-Abstract_in.pdf - 9 KB
  2.  ITS-Undergraduate-9462-4103100023-Abstract_en.pdf - 8 KB
  3.  ITS-Undergraduate-9462-4103100023-Conclusion.pdf - 9 KB




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