scholarly journals Corrections to the stiffness relationship in 3-sided and conical indentation problems

2019 ◽  
Vol 166 ◽  
pp. 154-166 ◽  
Author(s):  
Jin Haeng Lee ◽  
George M. Pharr ◽  
Yanfei Gao
Keyword(s):  
Conical Indentation

Finite Thickness Influence on Spherical and Conical Indentation on Viscoelastic Thin Polymer Film

2005 ◽  
Vol 127 (1) ◽  
pp. 33-37 ◽  
Author(s):  
V. Gonda ◽  
J. den Toonder ◽  
J. Beijer ◽  
G. Q. Zhang ◽  
L. J. Ernst
Keyword(s):  
Polymer Film ◽  
Material Properties ◽  
Finite Thickness ◽  
Thin Polymer Film ◽  
Spherical Indentation ◽  
Infinite Plane ◽  
Precise Knowledge ◽  
Thin Polymer ◽  
Measurement Results ◽  
Conical Indentation

The thermo-mechanical integration of polymer films requires a precise knowledge of material properties. Nanoindentation is a widely used testing method for the determination of material properties of thin films such as Young’s modulus and the hardness. An important assumption in the analysis of the indentation is that the indented medium is a semi-infinite plane or half space, i.e., it has an “infinite thickness.” In nanoindentation the analyzed material is often a thin film that is deposited on a substrate. If the modulus ratio is small, (soft film on hard substrate) and the penetration depth is small too, then the Hertzian assumption does not hold. We investigate this situation with spherical and conical indentation. Measurement results are shown using spherical indentation on a visco-elastic thin polymer film and a full visco-elastic characterization is presented.

scholarly journals Non-destructive test of steel structures by conical indentation

2017 ◽  
Vol 129 ◽  
pp. 02046 ◽  
Author(s):  
Alexey Beskopylny ◽  
Andrey Veremeenko ◽  
Elena Kadomtseva ◽  
Natalia Beskopylnaia
Keyword(s):  
Steel Structures ◽  
Destructive Test ◽  
Non Destructive ◽  
Conical Indentation

scholarly journals Conical indentation of incompressible rubber-like materials

2009 ◽  
Vol 46 (6) ◽  
pp. 1436-1447 ◽  
Author(s):  
A.E. Giannakopoulos ◽  
D.I. Panagiotopoulos
Keyword(s):  
Incompressible Rubber ◽  
Conical Indentation

scholarly journals Modeling indentation in linear viscoelastic solids

2004 ◽  
Vol 841 ◽  
Author(s):  
Yang-Tse Cheng ◽  
Che-Min Cheng
Keyword(s):  
Finite Element ◽  
Finite Element Modeling ◽  
Viscoelastic Properties ◽  
Viscoelastic Solids ◽  
Element Modeling ◽  
Elastic Plastic ◽  
Contact Depth ◽  
Linear Viscoelastic ◽  
The Relationship ◽  
Conical Indentation

ABSTRACTUsing analytical and finite element modeling, we study conical indentation in linear viscoelastic solids and examine the relationship between initial unloading slope, contact depth, and viscoelastic properties. We will then discuss whether the Oliver-Pharr method for determining contact depth, originally proposed for indentation in elastic and elastic-plastic solids, is applicable to indentation in viscoelastic solids.

Modeling conical indentation in homogeneous materials and in hard films on soft substrates

2005 ◽  
Vol 20 (2) ◽  
pp. 521-528 ◽  
Author(s):  
Wangyang Ni ◽  
Yang-Tse Cheng
Keyword(s):  
Indentation Depth ◽  
Total Work ◽  
Instrumented Indentation ◽  
Solid Materials ◽  
Reduced Modulus ◽  
Homogeneous Materials ◽  
Von Mises ◽  
Reversible Work ◽  
Incremental Theory Of Plasticity ◽  
Conical Indentation

Dimensional analysis and finite element modeling were conducted to examine conical indentation in homogeneous materials and in hard films on soft substrates. In this paper, the solid materials modeled follow the incremental theory of plasticity with a von-Mises yield surface. The validity of the Oliver–Pharr method was examined. It was found that, for hard films on soft substrates, the Oliver–Pharr method is applicable only when the indentation depth is less than 10% of the film thickness. A linear relationship between the ratio of hardness to reduced modulus and the ratio of reversible work to total work was observed for conical indentation in homogeneous materials and in hard films on soft substrates. This relationship can be used to analyze instrumented indentation experiments.

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