NDLI: Significance of Finite Compliance of a Cracked Piping System on Fracture Integrity Assessment

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Khan, I. A. Bhasin, V. Vaze, K. K. Ghosh, A. K. Kushwaha, H. S.
Copyright Year	2005
Abstract	One of the thrust areas in the integrity analysis of cracked nuclear piping system is concern with the reduction in moment, at the crack section due to combined effects of local and global residual compliance. However an important consideration in the design of piping system, which is generally not considered, is the re-distribution of load that occurs due to finite compliance of the piping system. The load at the crack section reduces while it increases generally at support/anchor locations, which may be high stressed locations. In case of stiff-piping system this re-distribution of load may be quite significant. Hence for the complete integrity of the piping system these un-cracked locations should also be re-assessed. A generalized procedure is suggested to take care of the reduction in load at the cracked section and corresponding increase in reactions at the support/anchor locations in a 3-D cracked piping system. Thus the stability of cracked section as well as other highly stressed locations can be simultaneously assessed. Here it is assumed that the remaining piping system behaves in a linear elastic manner and the plasticity remains confined to the cracked section only. Detailed finite element analyses are performed on circuitous (3-D) cracked piping system to validate the developed approach. Results presented in this article clearly show that due to reduction in moment the crack driving force, for the same external load, reduces significantly.
Sponsorship	Pressure Vessels and Piping Division
Starting Page	145
Ending Page	154
Page Count	10
File Format	PDF
ISBN	079184191X
DOI	10.1115/PVP2005-71278
e-ISBN	0791837637
Volume Number	Volume 6: Materials and Fabrication
Conference Proceedings	ASME 2005 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2005-07-17
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Stability Plasticity Fracture (materials) Finite element analysis Pipes Piping design Piping systems Stress Thrust
Content Type	Text
Resource Type	Article

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