Comment on “Berkovich nanoindentation of Zr55Cu30Al10Ni5 bulk metallic glass at a constant loading rate”, J. Non-Cryst. Solids, 561 (2021) 120750

2022 ◽  
Vol 575 ◽  
pp. 121203
Author(s):  
M. Munawar Chaudhri
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Loading Rate ◽  
Constant Loading ◽  
Constant Loading Rate

Molecular Dynamics Simulation of Nanoindentation on Folded Chain Crystal of Polyethylene

2005 ◽  
Vol 297-300 ◽  
pp. 2247-2252 ◽  
Author(s):  
Kisaragi Yashiro ◽  
Atsushi Furuta ◽  
Yoshihiro Tomita
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Loading Rate ◽  
Dynamics Simulation ◽  
Delayed Response ◽  
Berkovich Indenter ◽  
Orthorhombic Crystal ◽  
Constant Loading ◽  
Constant Loading Rate ◽  
The Ideal

Nanoindentation tests on a folded chain crystal of polyethylene are implemented with the molecular dynamics simulation. The orthorhombic crystal is made of the planar zig-zag chains and has the thickness of about 10nm. The ideal Berkovich indenter is plunged into upper surface of the crystal down to 2nm with the constant loading rate of 200m/s or 2000m/s. After the holding time of 1000fs at the maximum depth, the indenter is then pulled up with the same speed. The results are summarized as follows; a) The indentation of 2000m/s remains the residual depression while that of 200m/s recovers the hollow, b) No elastic component is found in the deformation under the both rate of 200m/s and 2000m/s, c) The crystal deforms statically under the indentation of 200m/s while that of 2000m/s shows delayed response.

Method of testing glass for strength with constant loading rate

1982 ◽  
Vol 39 (6) ◽  
pp. 277-279
Author(s):  
D. L. Orlov ◽  
�. A. Abramyan ◽  
A. A. Perova ◽  
R. Leiterits
Keyword(s):  
Loading Rate ◽  
Constant Loading ◽  
Constant Loading Rate

Dynamic characterization of Portevin–Le Chatelier instabilities occurring in depth-sensing microhardness tests

2003 ◽  
Vol 18 (12) ◽  
pp. 2874-2881 ◽  
Author(s):  
G. Bérces ◽  
J. Lendvai ◽  
A. Juhász ◽  
N.Q. Chinh
Keyword(s):  
Dynamic Model ◽  
Contact Surface ◽  
Indentation Depth ◽  
Loading Rate ◽  
Experimental Setup ◽  
Dynamic Characterization ◽  
Depth Sensing ◽  
Constant Loading ◽  
Constant Loading Rate

Characteristic properties of plastic instabilities were studied using depth-sensing microhardness experiments on an Al–3.3 wt.% Mg alloy and computer simulations based on a macroscopic dynamic model of the experimental setup. A stepwise increase was observed in the indentation depth versus load (d-F) curves measured in constant loading rate mode, indicating hardness oscillations around a nearly constant value of the conventional dynamic microhardness. These oscillations were correlated with plastic instabilities starting from the contact surface between the sample and the indenter head. Taking into account the experimentally determined connection between the hardness oscillations and the indentation velocity, a dynamic model was proposed for the characterization of instability steps.

scholarly journals Constant Loading Rate Consolidation Test

1970 ◽  
Vol 10 (1) ◽  
pp. 43-56 ◽  
Author(s):  
Hisao Aboshi ◽  
Hiroshi Yoshikuni ◽  
Seiichiro Maruyama
Keyword(s):  
Loading Rate ◽  
Constant Loading ◽  
Consolidation Test ◽  
Constant Loading Rate

Dynamic Crushing Behavior of the High-Density Closed-Cell Foams

2011 ◽  
Vol 306-307 ◽  
pp. 485-488
Author(s):  
Wei Chen ◽  
Zi Xing Lu
Keyword(s):  
Aspect Ratio ◽  
Loading Rate ◽  
High Density ◽  
Stress Strain ◽  
Constant Loading ◽  
Closed Cell ◽  
Crushing Behavior ◽  
Strain Model ◽  
Constant Loading Rate ◽  
Dynamic Crushing

The face-centered cubic model is used to investigate the dynamic crushing behavior of high density closed-cell foams. The influences of the constant loading rate and the specimen aspect ratio on the crushing stress were discussed. It is demonstrated that the crushing stress is more sensitive to the constant loading rate than the specimen aspect ratio. To describe the dynamic crushing behavior of the foam theoretically, the idealized rigid-perfectly plastic-locking (RPPL) stress-strain model is extended to a more general case, in which both the density and the cross-section area are discontinuous. The good agreement between the finite element results and theoretical results confirms that the dynamic crushing behavior of foam can be described by the modified RPPL stress-strain model.

Loading rate effect on inelastic deformation in a Zr-based bulk metallic glass

2007 ◽  
Vol 449-451 ◽  
pp. 185-188 ◽  
Author(s):  
Y.-H. Lee ◽  
J.-Y. Kim ◽  
S.H. Nahm ◽  
D. Kwon
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Inelastic Deformation ◽  
Loading Rate ◽  
Rate Effect
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