ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen

By M. Kuruppu, Yuzo Obara, M. Ayatollahi, Ken P. Chong, T. Funatsu. Rock Mechanics and Rock Engineering, 2013

762 citations recorded by the source corpus.

The International Society for Rock Mechanics has so far developed two standard methods for the determination of static fracture toughness of rock. They used three different core-based specimens and tests were to be performed on a typical laboratory compression or tension load frame. Another method to determine the mode I fracture toughness of rock using semi-circular bend specimen is herein presented. The specimen is semi-circular in shape and made from typical cores taken from the rock with any relative material directions noted. The specimens are tested in three-point bending using a laboratory compression test instrument. The failure load along with its dimensions is used to determine the fracture toughness. Most sedimentary rocks which are layered in structure may exhibit fracture properties that depend on the orientation and therefore measurements in more than one material direction may be necessary. The fracture toughness measurements are expected to yield a size-independent material property if certain minimum specimen size requirements are satisfied.

Subfields: Mechanics of Materials, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/42bfbc5039348de6dd78a76b1aaae88a9107fe2c

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Citations in the corpus

• Quasi-static and dynamic fracture behaviour of rock materials: phenomena and mechanisms (2014, methodology): “…suggested four standardized methods: chevron bend (CB) and short rod (SR) methods (Ouchterlony 1988), cracked chevron notched Brazilian disc (CCNBD) method (Fowell 1995), and notched semi-circular bending (NSCB) method (Kuruppu et al. 2014), for the determination of quasi-static fracture toughness.”
• Effects of strain rate on fracture toughness and energy release rate of gas shales (2017, methodology): “Rock cores with diameter of 50mmwere obtained and sliced into discs of required thickness (23.2±1mm, for this experiment), according to the standard procedures (as also followed by Kuruppu et al., 2014 and Lim et al., 1993, 1994a).”
• The Influence of Temperature on Mode I Fracture Toughness and Fracture Characteristics of Sandstone (2017, methodology): “Table 1 summarizes the specimen parameters, based on the ISRM-recommended standard specimen size ranges (Kuruppu et al. 2014).”
• A Further Improved Maximum Tangential Stress Criterion for Assessing Mode I Fracture of Rocks Considering Non-singular Stress Terms of the Williams Expansion (2018, methodology): “, CB, SR, CCNBD and SCB) have been recommended by the International Society for Rock Mechanics (ISRM) (Ouchterlony 1988; Fowell 1995; Kuruppu et al. 2014).”