scholarly journals Investigation on the influences of hygrothermal aging on the indentation size effects and micro-indentation measurements of PMMA. Part II: Analysis and modeling

2021 ◽  
Vol 93 ◽  
pp. 106938 ◽  
Author(s):  
Hui Lin ◽  
Lin Lv ◽  
Tao Jin ◽  
Qing Yin
Keyword(s):  
Size Effects ◽  
Indentation Size ◽  
Hygrothermal Aging ◽  
Micro Indentation

scholarly journals Investigation on the Influences of Hygrothermal Aging on the Indentation Size Effects and Micro-Indentation Measurements of PMMA. Part I: Experimental Results

2020 ◽  
Vol 10 (16) ◽  
pp. 5454 ◽  
Author(s):  
Hui Lin ◽  
Lin Lv ◽  
Tao Jin
Keyword(s):  
Elastic Modulus ◽  
Aging Time ◽  
Size Effects ◽  
Companion Paper ◽  
Strain Rates ◽  
Indentation Size ◽  
Hygrothermal Aging ◽  
Shear Transformation ◽  
Micro Indentation ◽  
Indentation Strain

The polymethyl methacrylate (PMMA) subjected to hygrothermal aging was applied to nanoindentation tests under different indentation strain rates. The influences of hygrothermal aging on the indentation behaviors of PMMA are discussed. Results show that the indentation elastic modulus and hardness decrease with increasing aging time. Furthermore, the indentation size effects (ISE) can be observed in aged PMMA specimens as they are sensitive to aging time as well as to the indentation strain rate. The quantitative analysis of ISE is proposed on the basis of shear transformation-mediated plasticity and was presented in our companion paper.

A study of indentation work in homogeneous materials

2006 ◽  
Vol 21 (6) ◽  
pp. 1363-1374 ◽  
Author(s):  
Mengxi Tan
Keyword(s):  
Plastic Deformation ◽  
Elastic Modulus ◽  
Elastic Energy ◽  
Size Effects ◽  
Unit Volume ◽  
Plastic Work ◽  
Total Work ◽  
Indentation Size ◽  
Scaling Relationships ◽  
Homogeneous Materials

The work of indentation is investigated experimentally in this article. A method of using the elastic energy to extract the elastic modulus is proposed and verified. Two types of hardness related to the work of indentation are defined and examined: Hwtis defined as the total work required creating a unit volume of contact deformationand Hwp is defined as the plastic work required creating a unit volume of plastic deformation; experiments show that both hardness definitions are good choices for characterizing hardness. Several features that may provide significant insights in understanding indentation measurements are studied. These features mainly concern some scaling relationships in indentation measurements and the indentation size effects.

Investigation on dynamic hardness and high strain rate indentation size effects in aluminium (110) using nano-impact

2019 ◽  
Vol 133 ◽  
pp. 55-62 ◽  
Author(s):  
Liguang Qin ◽  
Heng Li ◽  
Xiangru Shi ◽  
Ben D. Beake ◽  
Lin Xiao ◽  
...  
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Size Effects ◽  
High Strain ◽  
Indentation Size ◽  
Dynamic Hardness

Indentation size effects in spherical nanoindentation analyzed by experiment and non-local crystal plasticity

Materialia ◽  
2018 ◽  
Vol 3 ◽  
pp. 21-30 ◽  
Author(s):  
J.K. Engels ◽  
S. Gao ◽  
W. Amin ◽  
A. Biswas ◽  
A. Kostka ◽  
...  
Keyword(s):  
Crystal Plasticity ◽  
Size Effects ◽  
Indentation Size ◽  
Non Local

Length Scale Dependent Deformation in Polymers

2012 ◽  
Author(s):  
F. Alisafaei ◽  
Seyed Hamid Reza Sanei ◽  
Chung-Souk Han
Keyword(s):  
Liquid Crystal ◽  
Size Effects ◽  
Liquid Crystal Polymers ◽  
Length Scale ◽  
Indentation Testing ◽  
Indentation Size ◽  
Length Scales ◽  
Indentation Tests ◽  
Length Scale Dependent Deformation ◽  
Beam Bending

Length scale dependent deformation of polymers has been observed in different experiments including micro-beam bending and indentation tests. Here the length scale dependent deformation of polydimethylsiloxane is examined in indentation testing at length scales from microns down to hundreds of nanometers. Strong indentation size effects have been observed in these experiments which are rationalized with rotation gradients that can be related to Frank elasticity type molecular energies known from liquid crystal polymers. To support this notion additional experiments have been conducted where Berkovich and spherical indenter tips results have been compared with each other.

Indentation size effects on the creep behavior of nanocrystalline tetragonal Ta films

2009 ◽  
Vol 60 (6) ◽  
pp. 415-418 ◽  
Author(s):  
Z CAO ◽  
P LI ◽  
H LU ◽  
Y HUANG ◽  
Y ZHOU ◽  
...  
Keyword(s):  
Creep Behavior ◽  
Size Effects ◽  
Indentation Size
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