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Influence of Shot Peening and Post Heat Treatment on Fatigue Life of Welded Tubular Joint and Determination of Residual Stress Relaxation During Fatigue Loading
, M.Sc. Thesis Sharif University of Technology ; Farrahi, Gholamhossein (Supervisor)
Abstract
In the present work, the residual stress distribution in welded tubular X-joints of offshore platformshas been investigated. For this purpose a 3D thermo-mechanical finite element model for welding process has been proposed using Goldak thermal model. Residual stress of the joint is obtained using this model. The maximum temperature of the welding process and the maximum residual stress are 2050 °C and 370 MPa, respectively.
Then residual stress distribution of post weld heat treatment, fatigue loading and shot peening has been studied too. In order to simulate the post weld heat treatment, a decoupled thermo-mechanical analysis has been performed. The temperature of the furnace and the...
Then residual stress distribution of post weld heat treatment, fatigue loading and shot peening has been studied too. In order to simulate the post weld heat treatment, a decoupled thermo-mechanical analysis has been performed. The temperature of the furnace and the...
Fatigue life of repaired welded tubular joints
, Article International Journal of Engineering, Transactions A: Basics ; Volume 26, Issue 1 , 2013 , Pages 25-31 ; 10252495 (ISSN) ; Majzoobi, G. H ; Mahmoudi, A. H ; Habibi, N ; Sharif University of Technology
2013
Abstract
The subject of this study is to investigate the effect of repair on the fatigue life of tubular joints. Six cracked specimens previously subjected to fatigue loading underwent weld repair. Two of these specimens were shot peened before primary fatigue loading. It is shown that repair for the original specimens increases the fatigue life by roughly 150%. The increase of fatigue life for shot peened and repaired specimens is around 105%. The in-depth residual stresses are measured on the repaired joints before and after fatigue loading. It can be stated that repair made a remarkable improvement on the fatigue behavior of tubular joints examined in this investigation. However, where repair is...
The effect of shot peening on fatigue life of welded tubular joint in offshore structure
, Article Materials and Design ; Volume 36 , 2012 , Pages 250-257 ; 02641275 (ISSN) ; H-Gangaraj, S. M ; Farrahi, G. H ; Majzoobi, G. H ; Mahmoudi, A. H ; Daghigh, M ; Yari, A ; Moridi, A ; Sharif University of Technology
2012
Abstract
An offshore structure is exposed to environmental loading and cyclic stress variations throughout its life. This would result in the possibility of fatigue cracking in its members. Cracks in these structures usually initiate around welded areas, then grow progressively from the heat-affected zone to base metal through the thickness of the tubular members. Therefore, fatigue life improvement of offshore structures is of great importance. In this paper, structural analysis of an offshore platform is carried out and the critical joint is specified. The welding process is simulated and the residual stresses due to the welding are determined. Experimental residual stress measurement is carried...