Intermediate Strain Rate Material Characterization with Digital Image Correlation

10.3791/59168 ◽  
2019 ◽  
Author(s):  
Meysam Rahmat ◽  
David Backman ◽  
Richard Desnoyers
Keyword(s):  
Digital Image Correlation ◽  
Strain Rate ◽  
Digital Image ◽  
Material Characterization ◽  
Image Correlation ◽  
Intermediate Strain Rate

The Wavelike Plastic Deformation of Single Crystal Copper

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Russell J. McDonald ◽  
Christos Efstathiou ◽  
Peter Kurath
Keyword(s):  
Plastic Deformation ◽  
Digital Image Correlation ◽  
Strain Rate ◽  
Single Crystal ◽  
Digital Image ◽  
Surface Deformation ◽  
Image Correlation ◽  
Nominal Strain Rate ◽  
Single Crystal Copper ◽  
Nominal Strain

The purpose of this work is to explore nonuniform plastic flow at small length- and time-scales. Pure single crystal copper tensile specimens were pulled along the [6¯ 5 6] crystal axis at three nominal strain-rates: 0.01%/s, 0.04%/s, and 0.10%/s. Simultaneously, the surface deformation was monitored with in situ digital image correlation over a length-scale of ∼100 μm and a time-scale of 0.07–0.2 s. Sequential digital image correlation strain-rate fields show compelling evidence of a wavelike plastic deformation that is proportional to the nominal strain-rate and decelerates with increasing strain hardening. While a mechanism responsible for the waves is not identified, a methodology correlating observations of multiple researchers is forwarded.

scholarly journals Recent Milestones in Unraveling the Full-Field Structure of Dynamic Shear Cracks and Fault Ruptures in Real-Time: From Photoelasticity to Ultrahigh-Speed Digital Image Correlation

2020 ◽  
Vol 87 (3) ◽  
Author(s):  
A. J. Rosakis ◽  
V. Rubino ◽  
N. Lapusta
Keyword(s):  
Digital Image Correlation ◽  
Strain Rate ◽  
Digital Image ◽  
Image Correlation ◽  
Dynamic Friction ◽  
Dynamic Shear ◽  
Shear Cracks ◽  
Full Field ◽  
Transient Phenomena ◽  
Dynamic Fractures

Abstract The last few decades have seen great achievements in dynamic fracture mechanics. Yet, it was not possible to experimentally quantify the full-field behavior of dynamic fractures, until very recently. Here, we review our recent work on the full-field quantification of the temporal evolution of dynamic shear ruptures. Our newly developed approach based on digital image correlation combined with ultrahigh-speed photography has revolutionized the capabilities of measuring highly transient phenomena and enabled addressing key questions of rupture dynamics. Recent milestones include the visualization of the complete displacement, particle velocity, strain, stress and strain rate fields near growing ruptures, capturing the evolution of dynamic friction during individual rupture growth, and the detailed study of rupture speed limits. For example, dynamic friction has been the biggest unknown controlling how frictional ruptures develop but it has been impossible, until now, to measure dynamic friction during spontaneous rupture propagation and to understand its dependence on other quantities. Our recent measurements allow, by simultaneously tracking tractions and sliding speeds on the rupturing interface, to disentangle its complex dependence on the slip, slip velocity, and on their history. In another application, we have uncovered new phenomena that could not be detected with previous methods, such as the formation of pressure shock fronts associated with “supersonic” propagation of shear ruptures in viscoelastic materials where the wave speeds are shown to depend strongly on the strain rate.

scholarly journals Investigation of strain rate sensitivity of Gum Metal under tension using digital image correlation

2020 ◽  
Vol 20 (2) ◽  
Author(s):  
Karol Golasiński ◽  
Elżbieta Pieczyska ◽  
Michał Maj ◽  
Maria Staszczak ◽  
Paweł Świec ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Strain Rate ◽  
Strain Rate Sensitivity ◽  
Digital Image ◽  
Rate Sensitivity ◽  
Image Correlation ◽  
Gum Metal
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