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Materials characterisation part II: tip geometry of the Vickers indenter for microindentation tests

Jamal, M and Morgan, MN (2017) Materials characterisation part II: tip geometry of the Vickers indenter for microindentation tests. International Journal of Advanced Manufacturing Technology. ISSN 0268-3768

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Abstract

This is the second of two papers by the authors associated with materials characterisation methods based on hardness testing. It is important to have knowledge of the tip geometry of the indenter employed in the hardness test as this affects the correctness of the value of contact area parameter used to determine the mechanical properties. In this paper, outcomes of a study concerned with the tip geometry of the Vickers microindenter are presented. Results from experiment are compared with results from published works and the most current accepted analytical models. A new non-contact methodology based on a residual imprint imaging process is developed and further compared with other methods using experimental and numerical analyses over a wide range of material properties. For confirmation, an assessment was undertaken using numerical dimensional analysis which permitted a large range of materials to be explored. It is shown that the proposed method is more accurate compared with other methods regardless of the mechanical properties of the material. The outcomes demonstrate that measuring contact area with the new method enhanced the overall relative error in the resulting mechanical properties including hardness and Young’s modulus of elasticity. It is also shown that the value of the contact area using actual indenter geometry obtained from experimental load-displacement analysis or FEM numerical analysis is more accurate than the value obtained from the assumption of perfect indenter geometry and hence can be used for materials with low strain hardening property. © 2017 Springer-Verlag London

Item Type: Article
Additional Information: The final publication is available at Springer via http://dx.doi.org/10.1007/s00170-017-0176-6
Uncontrolled Keywords: 09 Engineering, 08 Information And Computing Sciences, 01 Mathematical Sciences
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TJ Mechanical engineering and machinery
Divisions: General Engineering Research Institute
Publisher: Springer Verlag
Date Deposited: 28 Mar 2017 11:01
Last Modified: 28 Mar 2017 11:01
DOI or Identification number: 10.1007/s00170-017-0176-6
URI: http://researchonline.ljmu.ac.uk/id/eprint/6133

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