Length scale dependent deformation in natural rubber

2015 ◽  
Vol 132 (43) ◽  
pp. n/a-n/a ◽  
Author(s):  
Gurudutt Chandrashekar ◽  
Farid Alisafaei ◽  
Chung-Souk Han
Keyword(s):  
Natural Rubber ◽  
Length Scale ◽  
Length Scale Dependent Deformation

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.

Length scale-dependent deformation behavior of nanolayered Cu/Zr micropillars

2012 ◽  
Vol 60 (4) ◽  
pp. 1610-1622 ◽  
Author(s):  
J.Y. Zhang ◽  
S. Lei ◽  
Y. Liu ◽  
J.J. Niu ◽  
Y. Chen ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Length Scale ◽  
Length Scale Dependent Deformation

Length-scale-dependent deformation mechanism of Cu/X (X=Ru, W) multilayer thin films

2016 ◽  
Vol 664 ◽  
pp. 206-214 ◽  
Author(s):  
Q. Zhou ◽  
Y. Li ◽  
F. Wang ◽  
P. Huang ◽  
T.J. Lu ◽  
...  
Keyword(s):  
Thin Films ◽  
Deformation Mechanism ◽  
Length Scale ◽  
Multilayer Thin Films ◽  
Length Scale Dependent Deformation

Indenter Tip Dependence in the Determination of Elastic Modulus in Polymers

2013 ◽  
Author(s):  
Seyed Hamid Reza Sanei ◽  
F. Alisafaei ◽  
Chung-Souk Han
Keyword(s):  
Mechanical Properties ◽  
Surface Roughness ◽  
Elastic Modulus ◽  
Indentation Depth ◽  
Length Scale ◽  
Berkovich Indenter ◽  
Thin Wires ◽  
Length Scale Dependent Deformation ◽  
Nanoindentation Experiment

The two most common outputs of nanoindentation experiment are hardness and elastic modulus. Length scale dependent deformation in polymers has however been observed in different experiments such as microbeam bending, torsional thin wires and indentation testing which may affect the mechanical testing. Unlike in metals where the size dependency is attributed to necessary geometry dislocations, the origin of length scale dependent deformation in polymers is not well understood. In this study, elastic modulus of polydimethylsiloxane (PDMS) is determined using both Berkovich and spherical tips. Observing different trends for elastic modulus upon the change of indentation depth using these two different tips brings up the question which tip should be used to get the real mechanical properties of PDMS which is discussed here. Surface roughness, surface effects and the imperfection of the Berkovich indenter tip are negligible at the studied length scale.

Sign in / Sign up

Export Citation Format

Share Document