Characterization of viscoelastic-plastic properties of solid polymers by instrumented indentation

2011 ◽  
Vol 30 (1) ◽  
pp. 101-109 ◽  
Author(s):  
Jaroslav Menčík ◽  
Li Hong He ◽  
Jiří Němeček
Keyword(s):  
Instrumented Indentation ◽  
Plastic Properties ◽  
Solid Polymers

Characterization of Anisotropy of Strength in API-X80 Line Pipe Welds Through Instrumented Indentation

2020 ◽  
Vol 9 (6) ◽  
pp. 884-894
Author(s):  
A. R. H. Midawi ◽  
N. Huda ◽  
C. H. M. Simha ◽  
A. P. Gerlich
Keyword(s):  
Instrumented Indentation ◽  
Line Pipe

scholarly journals Numerical verification for instrumented spherical indentation techniques in determining the plastic properties of materials

2009 ◽  
Vol 24 (12) ◽  
pp. 3653-3663 ◽  
Author(s):  
Taihua Zhang ◽  
Peng Jiang ◽  
Yihui Feng ◽  
Rong Yang
Keyword(s):  
Numerical Experiments ◽  
Spherical Indentation ◽  
Numerical Verification ◽  
Instrumented Indentation ◽  
Plastic Properties ◽  
Wide Range ◽  
Validity Range ◽  
Indentation Tests ◽  
Properties Of Materials ◽  
Indentation Methods

Instrumented indentation tests have been widely adopted for elastic modulus determination. Recently, a number of indentation-based methods for plastic properties characterization have been proposed, and rigorous verification is absolutely necessary for their wide application. In view of the advantages of spherical indentation compared with conical indentation in determining plastic properties, this study mainly concerns verification of spherical indentation methods. Five convenient and simple models were selected for this purpose, and numerical experiments for a wide range of materials are carried out to identify their accuracy and sensitivity characteristics. The verification results show that four of these five methods can give relatively accurate and stable results within a certain material domain, which is defined as their validity range and has been summarized for each method.

Characterization, structural transitions and properties of a tightly crosslinked polythiourethane network for optical applications

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Boris Jaffrennou ◽  
Nicolas Droger ◽  
Françoise Méchin ◽  
Jean-Louis Halary ◽  
Jean-Pierre Pascault
Keyword(s):  
Chemical Structure ◽  
Reactive System ◽  
Gel Point ◽  
Curing Process ◽  
Structure And Properties ◽  
Critical Temperatures ◽  
Plastic Properties ◽  
Optical Applications ◽  
Different Characteristics

AbstractA new polythiourethane thermosetting system based on a diisocyanate and a trithiol was studied. After characterization of the reactive species, two critical temperatures, namely Tg∞ (maximum glass transition temperature of the thermosetting system) and gelTg (Tg of the material at the gel point), were determined. The conversion at gel point was also determined and compared to the theoretical prediction. Two different characteristics of the evolution of a reactive system, Tg and conversion x as a function of time, were related. This is of particular interest for understanding the curing process, especially when non-isothermal cure schedules are used. Viscoelastic and plastic properties were investigated, with the aim of establishing connections between the chemical structure and properties through detailed analysis of the polymer chain motions (β and α relaxations). Measurements of the storage modulus at the rubbery plateau and of the critical strain intensity factor KIc complete the study.

scholarly journals Quantitative Characterization of Mechanical Properties using Instrumented Indentation

2011 ◽  
Vol 10 ◽  
pp. 3162-3172 ◽  
Author(s):  
Young-Cheon Kim ◽  
Won-Seok Song ◽  
Jong-Heon Kim ◽  
Kug-Hwan Kim ◽  
Dongil Kwon
Keyword(s):  
Mechanical Properties ◽  
Instrumented Indentation ◽  
Quantitative Characterization

Local Mechanical Characterization of Metal Foams by Nanoindentation

2015 ◽  
Vol 662 ◽  
pp. 59-62 ◽  
Author(s):  
Jiří Němeček ◽  
Vlastimil Kralik
Keyword(s):  
Cell Walls ◽  
Plastic Material ◽  
Spherical Indentation ◽  
Isotropic Hardening ◽  
Plastic Properties ◽  
Macro Scale ◽  
Static Indentation ◽  
Indentation Tests ◽  
Constitutive Parameters

This paper deals with microstructure and micromechanical properties of two commercially available aluminium foams (Alporas and Aluhab). Since none of the materials is available in a bulk and standard mechanical testing at macro-scale is not possible the materials need to be tested at micro-scale. To obtain both elastic and plastic properties quasi-static indentation was performed with two different indenter geometries (Berkovich and spherical tips). The material phase properties were analyzed with statistical grid indentation method and micromechanical homogenization was applied to obtain effective elastic wall properties. In addition, effective inelastic properties of cell walls were identified with spherical indentation. Constitutive parameters related to elasto-plastic material with linear isotropic hardening (the yield point and tangent modulus) were directly deduced from the load–depth curves of spherical indentation tests using formulations of the representative strain and stress introduced by Tabor.

Mechanical characterization of brittle materials using instrumented indentation with Knoop indenter

2017 ◽  
Vol 108 ◽  
pp. 58-67 ◽  
Author(s):  
Ghailen BEN Ghorbal ◽  
Arnaud Tricoteaux ◽  
Anthony Thuault ◽  
Ghislain Louis ◽  
Didier Chicot
Keyword(s):  
Mechanical Characterization ◽  
Brittle Materials ◽  
Instrumented Indentation ◽  
Knoop Indenter
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