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Title: Finite element studies of the influence of pile-up on the analysis of nanoindentation data

Abstract

Methods currently used for analyzing nanoindentation load-displacement data give good predictions of the contact area in the case of hard materials, but can underestimate the contact area by as much as 40% for soft materials which do not work harden. This underestimation results from the pile-up which forms around the hardness impression and leads to potentially significant errors in the measurement of hardness and elastic modulus. Finite element simulations of conical indentation for a wide range of elastic-plastic materials are presented which define the conditions under which pile-up is significant and determine the magnitude of the errors in hardness and modulus which may occur if pile-up is ignored. It is shown that the materials in which pile-up is not an important factor can be experimentally identified from the ratio of the final depth after unloading to the depth of the indentation at peak load, a parameter which also correlates with the hardness-to-modulus ratio.

Authors:
;  [1];  [2]
  1. Rice Univ., Houston, TX (United States). Dept. of Materials Science
  2. Nano Instruments, Inc., Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States); Oak Ridge Associated Universities, Inc., TN (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
230353
Report Number(s):
CONF-960401-17
ON: DE96009403; TRN: 96:003005
DOE Contract Number:  
AC05-96OR22464; AC05-76OR00033
Resource Type:
Conference
Resource Relation:
Conference: Spring meeting of the Materials Research Society (MRS), San Francisco, CA (United States), 8-12 Apr 1996; Other Information: PBD: 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; PLASTICS; ELASTICITY; HARDNESS; MEASURING METHODS; ERRORS; FINITE ELEMENT METHOD

Citation Formats

Bolshakov, A, Pharr, G M, and Oliver, W C. Finite element studies of the influence of pile-up on the analysis of nanoindentation data. United States: N. p., 1996. Web.
Bolshakov, A, Pharr, G M, & Oliver, W C. Finite element studies of the influence of pile-up on the analysis of nanoindentation data. United States.
Bolshakov, A, Pharr, G M, and Oliver, W C. Wed . "Finite element studies of the influence of pile-up on the analysis of nanoindentation data". United States. https://www.osti.gov/servlets/purl/230353.
@article{osti_230353,
title = {Finite element studies of the influence of pile-up on the analysis of nanoindentation data},
author = {Bolshakov, A and Pharr, G M and Oliver, W C},
abstractNote = {Methods currently used for analyzing nanoindentation load-displacement data give good predictions of the contact area in the case of hard materials, but can underestimate the contact area by as much as 40% for soft materials which do not work harden. This underestimation results from the pile-up which forms around the hardness impression and leads to potentially significant errors in the measurement of hardness and elastic modulus. Finite element simulations of conical indentation for a wide range of elastic-plastic materials are presented which define the conditions under which pile-up is significant and determine the magnitude of the errors in hardness and modulus which may occur if pile-up is ignored. It is shown that the materials in which pile-up is not an important factor can be experimentally identified from the ratio of the final depth after unloading to the depth of the indentation at peak load, a parameter which also correlates with the hardness-to-modulus ratio.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {5}
}

Conference:
Other availability
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