NDLI: Modeling and CMOD Mapping of Surface-Cracked Wide Plates

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Duan, Da-Ming Wang, Yong-Yi Chen, Yaoshan Zhou, Joe
Copyright Year	2008
Abstract	Curved wide plate (CWP) tests are frequently used to measure the tensile stress and strain capacity of pipeline girth welds. The parameters affecting the CWP measurement include specimen geometry and cooling setups. High-quality data is obtained when valid test conditions are confirmed. Crack mouth opening displacement (CMOD) is often measured in CWP tests. CMOD is a direct indicator of the amount of deformation at the cracked plane. It is an indirect indicator of the crack driving force (CDF) imparted on the crack. For a given test geometry and material, certain relationships can be derived between the measured CMOD and the more conventional representation of crack driving force, such as CTOD (crack tip opening displacement) and J-integral. Such relationships are a key element in fracture toughness testing standards. This kind of relationship is also particularly useful in strain-based design where CWP specimens are used for strain capacity and flaw growth prediction. In this paper finite element (FE) analysis is first used in modeling CWP testing conditions for X100 specimens with girth weld flaws to validate the test conditions. A novel approach called CMOD mapping is then developed to characterize the flaw behavior which, by making a direct use of CMOD test data from the CWP tests, is used to estimate the crack growth in the CWP. Finally analysis of strain limits using crack driving force (CDF) for the CWP specimens is also given by comparing experimental test data and FE estimation.
Sponsorship	International Petroleum Technology Institute and the Pipeline Division
Starting Page	665
Ending Page	673
Page Count	9
File Format	PDF
ISBN	9780791848593
DOI	10.1115/IPC2008-64425
e-ISBN	9780791838358
Volume Number	2008 7th International Pipeline Conference, Volume 3
Conference Proceedings	2008 7th International Pipeline Conference
Language	English
Publisher Date	2008-09-29
Publisher Place	Calgary, Alberta, Canada
Access Restriction	Subscribed
Subject Keyword	Test procedure Tensile strain capacity Wide plate test Pipeline Cooling Deformation Pipelines Fracture (materials) Modeling Displacement Fracture toughness Geometry Design Welded joints Plates (structures) Tension Finite element analysis Testing
Content Type	Text
Resource Type	Article

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