A Potential Solution to Mystical Materials in Indentation Test

Billur E., Cetin B., Music O., Simsir C. , Davut K.

International Conference on the Technology of Plasticity (ICTP), Cambridge, Canada, 17 - 22 September 2017, vol.207, pp.962-967 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 207
  • Doi Number: 10.1016/j.proeng.2017.10.967
  • City: Cambridge
  • Country: Canada
  • Page Numbers: pp.962-967


Various methods have been designed to determine the elasto-plastic properties of metals. Instrumented indentation test (IIT) is considered to be a good candidate to determine local properties after manufacturing operations. In order to acquire elastoplastic properties from IIT, either dimensional analysis or inverse analysis of the force-displacement curve is performed. However, the major drawback of those methods is the uniqueness of the solution. Some materials may exhibit almost identical force-depth curves, although they have different elastoplastic properties. Those materials are referred as "mystical materials". In this contribution, topological features of the indentation surfaces, i.e. indent size, pile-up and sink-in behaviour, are investigated to find a differentiating property. According to the results, indent size, pile-up and sink-in behaviour may help to find the unique solution to the inverse problem. (C) 2017 The Authors. Published by Elsevier Ltd. Peer-review under responsibility of the scientific committee of the International Conference on the Technology of Plasticity.