Dynamic initiation fracture toughness determination and full-field strain measurements of rock material

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Abstract

The purpose of this paper is to present a detailed experimental procedure for the quantitative determination of initiation fracture toughness and full-field strain measurement of rock material under dynamic loads. Notched semi-circular bending tests were conducted using a split Hopkinson pressure bar (SPHB) system. Experimental setup, data acquisition and interpretation were described in detail. The digital image correlation (DIC) technique combining with a high-speed cameral was adopted for the measurement of surface deformation characteristics of rock specimens. To verify the accuracy of this technique, comparative tests were performed in which the strains in the specimens were simultaneously determined using the DIC technique and on-specimen strain gauges. Strain gauges were also used to determine the time-to-fracture. Experimental results show that (1) dynamic crack initiation toughness can be well determined; and (2) the high-speed DIC technique provides reliable full-field strain fields in the specimens under dynamic loads.

Original languageEnglish
Title of host publication19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012
PublisherEuropean Conference on Fracture, ECF
Pages1-8
Number of pages8
ISBN (Print)978-5-905576-18-8
Publication statusPublished - 2012
Externally publishedYes
EventEuropean Conference of Fracture 2012: Fracture Mechanics for Durability, Reliability and Safety - Kazan, Russian Federation
Duration: 26 Aug 201231 Aug 2012
Conference number: 19th
http://www.proceedings.com/27521.html

Conference

ConferenceEuropean Conference of Fracture 2012
Abbreviated titleECF 2012
CountryRussian Federation
CityKazan
Period26/08/1231/08/12
Internet address

Keywords

  • Digital image correlation
  • Dynamic initiation fracture toughness
  • Full-field strain field
  • Rock material
  • Split Hopkinson pressure bar

Cite this

Zhang, Q., & Wu, W. (2012). Dynamic initiation fracture toughness determination and full-field strain measurements of rock material. In 19th European Conference on Fracture: Fracture Mechanics for Durability, Reliability and Safety, ECF 2012 (pp. 1-8). European Conference on Fracture, ECF.