Volume 6, Issue 9 (October 2009)

    Determination of ΔKth by Compression Pre-Cracking in a Structural Steel

    (Received 15 June 2009; accepted 4 August 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    The traditional experimental procedures used to generate thresholds (known as “ΔK-decreasing” and “constant Kmax”) have been challenged because it seems they affect the experimental results, sometimes in a non conservative way. In order to fix this problem, different experimental procedures (“compression pre-cracking constant amplitude” and “compression pre-cracking load reduction” (CPLR)) based on a compression-compression pre-cracking of fracture mechanics specimens have been proposed. Up till now, such procedures are not yet wide-spread between fracture mechanics experimentalists. In particular, due to the recent introduction, CPLR has been applied only to few cases: Al alloys, Ti alloys, and high strength steels (ultimate tensile strength>1300 MPa), all in the shape of M(T) or C(T) specimens subjected to positive stress ratios. The present paper deals with the application of these novel “compression pre-cracking” procedures, with particular attention to CPLR, to the unexplored and technically very important case of the structurally mild A1N steel grade (very commonly used to produce European railway axles) in the shape of SE(B) specimens subjected to stress ratios varying between −2 and 0.85.


    Author Information:

    Carboni, M.
    Dept. of Mechanical Engineering, Politecnico di Milano, Milano,

    Patriarca, L.
    Dept. of Mechanical Engineering, Politecnico di Milano, Milano,

    Regazzi, D.
    Dept. of Mechanical Engineering, Politecnico di Milano, Milano,


    Stock #: JAI102617

    ISSN: 1546-962X

    DOI: 10.1520/JAI102617

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    Author
    Title Determination of ΔKth by Compression Pre-Cracking in a Structural Steel
    Symposium Ninth International ASTM/ESIS Symposium on Fatigue and Fracture Mechanics (37th ASTM National Symposium on Fatigue and Fracture Mechanics), 2009-05-22
    Committee E08