Use of spherical indentation technique for measurement of property variations of γTiAl

2011 ◽  
Vol 27 (1) ◽  
pp. 378-388 ◽  
Author(s):  
Alfred Cornec ◽  
Mohammad Rizviul Kabir ◽  
Norbert Huber
Keyword(s):  
Spherical Indentation ◽  
Indentation Technique ◽  
Image Position

Abstract

A spherical indentation technique for property evaluation of hyperelastic rubber

2012 ◽  
Vol 27 (20) ◽  
pp. 2677-2690 ◽  
Author(s):  
Hong Chul Hyun ◽  
Jin Haeng Lee ◽  
Minsoo Kim ◽  
Hyungyil Lee
Keyword(s):  
Spherical Indentation ◽  
Indentation Technique ◽  
Property Evaluation ◽  
Image Position

Abstract

Can indentation technique measure unique elastoplastic properties?

2009 ◽  
Vol 24 (3) ◽  
pp. 784-800 ◽  
Author(s):  
Ling Liu ◽  
Nagahisa Ogasawara ◽  
Norimasa Chiba ◽  
Xi Chen
Keyword(s):  
Critical Strain ◽  
Indentation Test ◽  
Strain Curve ◽  
Spherical Indentation ◽  
Plastic Behavior ◽  
Displacement Curve ◽  
Application Range ◽  
Indentation Technique ◽  
Elastoplastic Properties ◽  
Force Displacement

Indentation is widely used to extract material elastoplastic properties from measured force-displacement curves. Many previous studies argued or implied that such a measurement is unique and the whole material stress-strain curve can be measured. Here we show that first, for a given indenter geometry, the indentation test cannot effectively probe material plastic behavior beyond a critical strain, and thus the solution of the reverse analysis of the indentation force-displacement curve is nonunique beyond such a critical strain. Secondly, even within the critical strain, pairs of mystical materials can exist that have essentially identical indentation responses (with differences below the resolution of published indentation techniques) even when the indenter angle is varied over a large range. Thus, fundamental elastoplastic behaviors, such as the yield stress and work hardening properties (functions), cannot be uniquely determined from the force-displacement curves of indentation analyses (including both plural sharp indentation and deep spherical indentation). Explicit algorithms of deriving the mystical materials are established, and we qualitatively correlate the sharp and spherical indentation analyses through the use of critical strain. The theoretical study in this paper addresses important questions of the application range, limitations, and uniqueness of the indentation test, as well as providing useful guidelines to properly use the indentation technique to measure material constitutive properties.

scholarly journals Characterization of homogenous and plastically graded materials with spherical indentation and inverse analysis

2011 ◽  
Vol 27 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Charbel Moussa ◽  
Olivier Bartier ◽  
Gérard Mauvoisin ◽  
Philippe Pilvin ◽  
Guillaume Delattre
Keyword(s):  
Inverse Analysis ◽  
Spherical Indentation ◽  
Graded Materials ◽  
Image Position ◽  
Plastically Graded

Abstract

A novel method for determining surface residual stress components and their directions in spherical indentation

2015 ◽  
Vol 30 (8) ◽  
pp. 1078-1089 ◽  
Author(s):  
Lei Shen ◽  
Yuming He ◽  
Dabiao Liu ◽  
Qiang Gong ◽  
Bo Zhang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Spherical Indentation ◽  
Surface Residual Stress ◽  
Stress Components ◽  
Novel Method ◽  
Image Position

Abstract

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