• Fracture toughness is a measure of the energy required to extend a crack and is a crucial parameter required in hydraulic fracturing design.
  • Most commercial fracture modeling software require fracture toughness as an input parameter.
  • Mode I fracture toughness is measured in the laboratory using the ISRM recommended Cracked Chevron Notch Brazilian Disc (CCNBD) test.
  • Material requirements for CCNBD based fracture toughness are more economic than other recommended methods.

Recommended Sample Dimensions:

  • Diameter – 2 inch
  • Length – 0.8 inch


  • Brazilian Testing Unit
  • Brazilian Testing Clamps
  • Elastic Anisotropy Study
  • Compressional Testing
  • Hydraulic Fracture Modeling