Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7740
Title: Quantitative impact testing of energy dissipation at surfaces
Authors: Constantinides, Georgios 
Tweedie, Catherine A. 
Savva, Nikos 
Smith, James Fielding 
Vliet, Krystyn J Van 
Keywords: Energy dissipation;Impact;Surfaces;Speed
Category: Nano-technology
Field: Engineering and Technology
Issue Date: 2009
Publisher: Springer
Source: Experimental Mechanics, 2009, Volume 49, Issue 4, Pages 511-522
Abstract: Impact testing with nanoscale spatial, force, and temporal resolution has been developed to address quantitatively the response of surfaces to impingement of local contact at elevated velocities. Here, an impact is generated by imparting energy to a pendulum carrying an indenter, which then swings towards a specimen surface. The pendulum displacement as a function of time x (t) is recorded, from which one can extract the maximum material penetration x max, residual deformation x r, and indentation durations t in and t out. In an inverse application one can use the x (t) response to extract material constants characterizing the impact deformation and extent of energy absorption, including material specific resistance coefficient C in, coefficient of restitution e, and dynamic hardness H imp. This approach also enables direct access to the ratio H/E, or resilience of the deformed material volume, at impact velocities of interest. The impact response of aluminum was studied for different contact velocities, and the mechanical response was found to correlate well with our one-dimensional contact model. Further experiments on annealed and work hardened gold showed that dynamic hardness H imp scales with contact velocity and highlighted the importance of rate-dependent energy absorption mechanisms that can be captured by the proposed experimental approach.
URI: http://ktisis.cut.ac.cy/handle/10488/7740
ISSN: 00144851
DOI: 10.1007/s11340-008-9198-1
Rights: © Society for Experimental Mechanics
Type: Article
Appears in Collections:Άρθρα/Articles

Show full item record

SCOPUSTM   
Citations 10

26
checked on Nov 14, 2017

WEB OF SCIENCETM
Citations 5

24
Last Week
0
Last month
1
checked on Sep 15, 2017

Page view(s)

27
Last Week
1
Last month
2
checked on Nov 21, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.