A novel method to determine material properties and residual stresses simultaneously using spherical indentation

Mahmoudi, A. H.; Ghanbari-Matloob, M.; Nourbakhsh, S. H.

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.

• Journal Article Type: Article
• Acceptance Date: Jan 22, 2014
• Online Publication Date: Mar 18, 2014
• Publication Date: Jan 22, 2015
• Deposit Date: Sep 13, 2024
• Journal: Journal of Testing and Evaluation
• Print ISSN: 0090-3973
• Publisher: ASTM International
• Peer Reviewed: Peer Reviewed
• Volume: 43
• Issue: 1
• Pages: 87-95
• DOI: https://doi.org/10.1520/jte20130236
• Public URL: https://uwe-repository.worktribe.com/output/12888814