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Materials 2017, 10(4), 404; doi:10.3390/ma10040404

Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation

Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
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Academic Editor: Ting Tsui
Received: 14 March 2017 / Revised: 5 April 2017 / Accepted: 6 April 2017 / Published: 12 April 2017
(This article belongs to the Special Issue Advanced Nanoindentation in Materials)
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Abstract

Vickers indentation fracture can be used to estimate equibiaxial residual stresses (RS) in brittle materials. Previous, conceptually-equal, analytical models were established on the assumptions that (i) the crack be of a semi-circular shape and (ii) that the shape not be affected by RS. A generalized analytical model that accounts for the crack shape and its change is presented. To assess these analytical models and to gain detailed insight into the crack evolution, an extended finite element (XFE) model is established. XFE analysis results show that the crack shape is generally not semi-circular and affected by RS and that tensile and compressive RS have different effects on the crack evolution. Parameter studies are performed to calibrate the generalized analytical model. Comparison of the results calculated by the analytical models with XFE results reveals the inaccuracy inherent in the previous analytical models, namely the neglect of (the change of) the crack aspect-ratio, in particular for tensile RS. Previous models should therefore be treated with caution and, if at all, used only for compressive RS. The generalized model, on the other hand, gives a more accurate description of the RS, but requires the crack depth. View Full-Text
Keywords: residual stress; indentation fracture; fracture toughness; extended finite element analysis residual stress; indentation fracture; fracture toughness; extended finite element analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Rickhey, F.; Marimuthu, K.P.; Lee, H. Investigation on Indentation Cracking-Based Approaches for Residual Stress Evaluation. Materials 2017, 10, 404.

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