Assessment of Dynamic Fracture in Ultra-High Performance Concrete Using Synchrotron X-ray Source

Nesredin Kedir*, Shane Paulson, Cody Kirk, Tao Sun, Kamel Fezzaa, Wayne Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Ultra-high-performance concretes (UHPCs) retain higher ultimate (compressive) strengths and greater durability relative to traditional concrete materials. As a result, they are enabling construction materials for blast resistant structures, where a higher capacity for energy absorption is required. In past investigations, the strength of UHPCs was shown to retain a dependency on strain rate. Still, the failure mechanisms which govern this rate dependency have yet to be completely elucidated. In the current study, the dynamic fracture behavior of Cor-tuf UHPC was assessed, in-situ, using a Synchrotron X-ray source in phase contrast imaging (PCI) mode. Prior to testing, the material’s morphology was characterized using X-ray computed tomography (CT) and scanning electron microscopy (SEM). A polychromatic pulsed X-ray source, high-speed camera and Kolsky bar apparatus were used in tandem, to observe the transient failure modes. A pin was placed at the end of the incident bar to control the location of damage initiation, and tests were performed at a constant velocity of ~6 m/s. These test conditions were observed to yield cracks with median and/or cone like geometries. Despite the variation in the crack paths, a significant difference in peak load was not observed. The failure mode was also observed to depend on the microstructure of the concrete samples.

Original languageEnglish (US)
Title of host publicationDynamic Behavior of Materials, Volume 1 - Proceedings of the 2019 Annual Conference on Experimental and Applied Mechanics
EditorsLeslie E. Lamberson
PublisherSpringer
Pages181-183
Number of pages3
ISBN (Print)9783030300203
DOIs
StatePublished - 2020
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019 - Reno, United States
Duration: Jun 3 2019Jun 6 2019

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2019
Country/TerritoryUnited States
CityReno
Period6/3/196/6/19

Keywords

  • Kolsky bar
  • Phase contrast imaging
  • Synchrotron source
  • UHPCs
  • X-ray computed tomography (CT)

ASJC Scopus subject areas

  • General Engineering
  • Computational Mechanics
  • Mechanical Engineering

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