Analysis of sharp-tip-indentation load–depth curve for contact area determination taking into account pile-up and sink-in effects
- 1 November 2004
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 19 (11), 3307-3315
- https://doi.org/10.1557/jmr.2004.0419
Abstract
Hardness and elastic modulus of micromaterials can be evaluated by analyzing instrumented sharp-tip-indentation load–depth curves. The present study quantified the effects of tip-blunting and pile-up or sink-in on the contact area by analyzing indentation curves. Finite-element simulation and theoretical modeling were used to describe the detailed contact morphologies. The ratio f of contact depth, i.e., the depth including elastic deflection and pile-up and sink-in, to maximum indentation depth, i.e., the depth measured only by depth sensing, ignoring elastic deflection and pile-up and sink-in, was proposed as a key indentation parameter in evaluating real contact depth during indentation. This ratio can be determined strictly in terms of indentation-curve parameters, such as loading and unloading slopes at maximum depth and the ratio of elastic indentation energy to total indentation energy. In addition, the value of f was found to be independent of indentation depth, and furthermore the real contact area can be determined and hardness and elastic modulus can be evaluated from f. This curve-analysis method was verified in finite-element simulations and nanoindentation experiments.Keywords
This publication has 23 references indexed in Scilit:
- Mechanical Behavior of MaterialsPublished by Cambridge University Press (CUP) ,2008
- Understanding nanoindentation unloading curvesJournal of Materials Research, 2002
- Scaling relationships for indentation measurementsPhilosophical Magazine A, 2002
- Method to determine the plastic properties of bulk materials by nanoindentationPhilosophical Magazine A, 2002
- Direct measurement of residual contact area and volume during the nanoindentation of coated materials as an alternative method of calculating hardnessPhilosophical Magazine A, 2002
- Indentation load–displacement curve, plastic deformation, and energyJournal of Materials Research, 2002
- Analysis of mechanical property distribution in multiphase ultra-fine-grained steels by nanoindentationScripta Materialia, 2001
- Simplified method for analyzing nanoindentation data and evaluating performance of nanoindentation instrumentsJournal of Materials Research, 2001
- Determination of indenter tip geometry and indentation contact area for depth-sensing indentation experimentsJournal of Materials Research, 1998
- Analysis of nanoindentation load-displacement loading curvesJournal of Materials Research, 1996