Tensile and Flexural Behavior of Ultra-High Performance Concrete (UHPC) under Impact Loading

Yiming Yao, Flavio A. Silva, Marko Butler, Viktor Mechtcherine, Barzin Mobasher

Research output: Contribution to journalArticlepeer-review

Abstract

The rate-sensitive properties of ultra-high performance concrete (UHPC) subjected to flexural and direct tensile loads were investigated. Dynamic flexural tests were performed by means of a drop hammer impact machine, whereas a servo-hydraulic system was utilized to conduct direct tension tests. The absorbed energy of the UHPC specimens under flexure increased from 0.74 to 4.49 J as the input energy varied from 6.7 to 67 J. The load-bearing capacity and maximum flexural deformation exhibited identical trends as the input energy increased. The high-speed tensile properties, including strength, ductility, and energy dissipation capacity, improved upon increasing the strain rate up to 100 s-1. A nonuniform distribution of the deformation of UHPC specimens under high-speed tension was observed by identifying the zones of strain localization (near crack), uniform strain (far field), and shear lag (transition zone in between) using digital image correlation. The full-field data of displacement, strain, and strain rates were obtained and quantitatively evaluated. The results indicated that multiple mechanisms were involved in the rate-dependent behavior of the UHPC specimens.

Original languageEnglish (US)
Article number103866
JournalInternational Journal of Impact Engineering
Volume153
DOIs
StatePublished - Jul 2021

Keywords

  • digital image correlation (DIC)
  • failure localization
  • flexural impact
  • high-speed tensile test
  • strain-rate field
  • UHPC

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Automotive Engineering
  • Aerospace Engineering
  • Safety, Risk, Reliability and Quality
  • Ocean Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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