The continued improvements in non-destructive testing (NDT) make it possible to detect smaller and smaller flaws in pressure vessel and piping. These small flaws are usually simplified as small cracks in structure integrity evaluation and remain life prediction in practice. Traditional fracture parameters can not be used to estimate the fatigue crack growth rate at the small crack tip, so there is not a normalized standard for structural durability and damage tolerance design. In this study the relationship between the stress and strain at the stationary crack tips and the ratio (a/W) of the different crack lengths (a) to the width of the specimen (W) is investigated by the elastic-plastic finite element method (EPFEM) with a central-crack plate model. The results indicate that if the ratio (a/W) is small enough, i.e. a/W⩽0.005, the plastic strain as damage variable should be performed using the small crack theory. Otherwise, damage-tolerant life calculations could be performed using the stress intensity factor.
Skip Nav Destination
ASME 2011 Pressure Vessels and Piping Conference
July 17–21, 2011
Baltimore, Maryland, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4451-9
PROCEEDINGS PAPER
The Effect of the Stress and Strain in Stationary Small Crack Tips for the Different Crack Lengths
Xiurong Fang,
Xiurong Fang
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Search for other works by this author on:
He Xue,
He Xue
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Search for other works by this author on:
Wei Tang,
Wei Tang
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Search for other works by this author on:
Lingyan Zhao
Lingyan Zhao
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Search for other works by this author on:
Xiurong Fang
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
He Xue
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Wei Tang
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Lingyan Zhao
Xi’an University of Science and Technology, Xi’an, Shaanxi, China
Paper No:
PVP2011-57432, pp. 1001-1006; 6 pages
Published Online:
May 21, 2012
Citation
Fang, X, Xue, H, Tang, W, & Zhao, L. "The Effect of the Stress and Strain in Stationary Small Crack Tips for the Different Crack Lengths." Proceedings of the ASME 2011 Pressure Vessels and Piping Conference. Volume 1: Codes and Standards. Baltimore, Maryland, USA. July 17–21, 2011. pp. 1001-1006. ASME. https://doi.org/10.1115/PVP2011-57432
Download citation file:
12
Views
Related Proceedings Papers
Related Articles
Nondestructive Evaluation of FRP Design Criteria With Primary Consideration to Fatigue Loading
J. Pressure Vessel Technol (May,2004)
Comparison of Methods for Calculating Stress Intensity Factors for the Thread of a Pressure Vessel Closure and of a Gun Breech Ring
J. Pressure Vessel Technol (August,2003)
Damage-Mitigating Control With Overload Injection: Experimental Validation of the Concept
J. Dyn. Sys., Meas., Control (June,2000)
Related Chapters
Materials
Power Boilers: A Guide to the Section I of the ASME Boiler and Pressure Vessel Code, Second Edition
Overview of Section XI Stipulations
Companion Guide to the ASME Boiler and Pressure Vessel Code, Volume 2, Third Edition
Overview of Section XI Stipulations
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 2, Second Edition: Criteria and Commentary on Select Aspects of the Boiler & Pressure Vessel and Piping Codes