• Eriksen, Rasmus N. W.
• Meyland, Martin Jensen
• Nielsen, Jens Henrik

Abstract

A novel experimental setup for dynamic material characterisation thatcombines a ring-on-ring test configuration for equibiaxial flexuraltesting with a modification of the well-known split-Hopkinson pressurebar (SHPB) is presented. The design is generic, but in the present paperintended for and validated by experiments on flat circular glasssamples at high strain rates. The novel modification allows anunobstructed view of a significant part of the sample’s tensile surfacethat is made possible by replacing the conventional transmission barwith a tube through which the incident bar passes. This modificationenables the application of high-speed cameras for assessing the fracturetogether with stereo digital image correlation (stereo-DIC) fornon-contact out-of-plane displacement measurements and, at the sametime, reduces the total length of the setup compared to the originaldesign. An FE-model of the bar/tube system was generated to characterisethe setup better. From that, information on strain gauge locations wasextracted. Two similar experiments on glass show that the requireddynamic force equilibrium could be established and that the applicationof high-speed cameras work as intended. Lastly, promising results wereachieved from the pilot stereo-DIC measurements, indicating pure bendingdeflections of the sample in line with theory.

Topics

• impedance spectroscopy
• surface
• theory
• experiment
• glass
• glass
• lime