NDLI: Propose of Simplified Stress Intensity Factor Equation for SCC Extension of the Pipe Welds

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ochi, Mayumi Hojo, Kiminobu Muroya, Itaru Ogawa, Kazuo
Copyright Year	2008
Abstract	Alloy 600 weld joints have potential for primary water stress corrosion cracks (PWSCC). At the present time it has been understood that PWSCC generates and propagates in the Alloy 600 base metal and the Alloy 600 weld metal and there has been no observation of cracking the stainless and the low alloy steel. For the life time evaluation of the pipes or components the crack extension analysis is required. To perform the axial crack extension analysis the stress intensity database or estimation equation corresponding to the extension crack shape is needed. From the PWSCC extension nature mentioned above, stress intensity factors of the conventional handbooks are not suitable because most of them assume a semi-elliptical crack and the maximum aspect ratio crack depth/crack half length is one (The evaluation in this paper had been performed before API 579-1/ASME FFS was published). Normally, with the advance of crack extension in the thickness direction at the weld joint, the crack aspect ratio exceeds one and the K-value of the conventional handbook can not be applied. Even if those equations are applied, the result would be overestimated. In this paper, considering characteristics of PWSCC’s extension behavior in the welding material, the axial crack was modeled in the FE model as a rectangular shape and the stress intensity factors at the deepest point were calculated with change of crack depth. From the database of the stress intensity factors, the simplified equation of stress intensity factor with parameter of radius/thickness and thickness/weld width was proposed.
Sponsorship	Pressure Vessels and Piping
Starting Page	153
Ending Page	158
Page Count	6
File Format	PDF
ISBN	9780791848265
DOI	10.1115/PVP2008-61828
e-ISBN	0791838285
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2008 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2008-07-27
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Water American petroleum institute Cracking (materials) Welding Metals Alloys Fitness-for-service Fracture (materials) Stress corrosion cracking Stress Alloy steel Base metals Welded joints Fracture (process) Finite element model Databases Shapes Pipes
Content Type	Text
Resource Type	Article

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