Failure of an internally threaded structure: the valve centre spool

    Authors

    S. N. Akour;J. F. Nayfeh

    Comments

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    Abbreviated Journal Title

    Proc. Inst. Mech. Eng. Part C-J. Eng. Mech. Eng. Sci.

    Keywords

    internally threaded centre-spool; valves; brittle fracture; stress; intensity factor; failure criterion; STRESS-CONCENTRATION FACTORS; INTENSITY FACTORS; CONNECTIONS; CRACK; Engineering, Mechanical

    Abstract

    The failure of the internally threaded centre spool of large valves is investigated. Brittle fracture occurred at the root of the internally threaded area. Several visual tests were performed. Visual investigation shows that the failure occurs on the last thread engaged with the bolt. Primary finite element method analysis shows that the last thread root has the highest stress concentration and opening mode of fracture mechanics. Redesign optimization and a parametric study are carried out. Reduction of the stress concentration is achieved and so the fracture is prevented.

    Journal Title

    Proceedings of the Institution of Mechanical Engineers Part C-Journal of Mechanical Engineering Science

    Volume

    216

    Issue/Number

    12

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    1157

    Last Page

    1163

    WOS Identifier

    WOS:000180289600002

    ISSN

    0954-4062

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