An overview of using the minimum of three equivalent (MOTE) in the assessment of fracture toughness behaviour in the context of BS 7910

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-12-06 DOI:10.1016/j.ijpvp.2024.105403

Paul U. Sukpe , Fabian S. Sorce , Catrin M. Davies , Stephen J. Garwood , Dan Cogswell , Henryk Pisarski

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Abstract

In this work, fracture toughness values used in engineering critical assessment (ECA) based on the minimum of three equivalent (MOTE) concept within the British Standard (BS) 7910 framework has been examined. The MOTE concept, statistical analyses, and the implications of selecting fracture toughness values using MOTE on ECA outcome are discussed. BS 7910 specifies that the lowest test result should be used when 3 to 5 results are available, the second lowest for 6 to 10 and third lowest for 11 to 15. However, this approach assumes that the data is homogeneous, and the MOTE concept is only valid for minimum of three results when scatter is limited.

Four fracture toughness distributions were defined in this study, with characteristic values estimated using a

\ln

-normal distribution and Monte Carlo simulations. The findings suggest that the

\ln

-normal approach offers more reliable fracture toughness estimates, and ten test results are generally adequate. However, for high-integrity applications, it is recommended to use at least twenty-five test results to estimate the characteristic fracture toughness based on a 5th percentile with 75 % confidence.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.