Volume 43, Issue 1 (January 2015)

    A Novel Method to Determine Material Properties and Residual Stresses Simultaneously Using Spherical Indentation

    (Received 19 September 2013; accepted 22 January 2014)

    Published Online: 2014

    CODEN: JTEOAD

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    Abstract

    Spherical indentation is one of the non-destructive techniques that has gained great interest among researchers in recent years. Spherical indentation is inexpensive and quick and can provide a fairly accurate estimation of in-plane residual stresses. This method has typically been used to characterize material properties. However, the application of the technique to measure residual stresses has also been practiced. In this paper, the parameters of Hollomon’s equation and residual stresses were determined using the load–penetration (P–h) curve technique obtained from a single loading-unloading spherical indentation test. Artificial Neural Networks (ANN) were employed to achieve the best results from the data. Neural networks are trained using the data from a series of finite element analyses. An exponential equation is then fitted to the loading curve. Having the fitted equation and the trained neural networks, the residual stresses and the material characteristics were found simultaneously. An important benefit of this method was that it could be used with no requirement for a reference stress-free sample.


    Author Information:

    Mahmoudi, A. H.
    Mechanical Engineering Department, Engineering Faculty, Bu-Ali Sina Univ., Hamedan,

    Ghanbari-Matloob, M.
    Mechanical Engineering Dept., Engineering Faculty, Bu-Ali Sina Univ., Hamedan,

    Nourbakhsh, S. H.
    Mechanical Engineering Dept., Engineering Faculty, Bu-Ali Sina Univ., Hamedan,


    Stock #: JTE20130236

    ISSN: 0090-3973

    DOI: 10.1520/JTE20130236

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    Author
    Title A Novel Method to Determine Material Properties and Residual Stresses Simultaneously Using Spherical Indentation
    Symposium , 0000-00-00
    Committee E28