Double torsion testing machine to determine the subcritical fracture index in rocks

  • Pedro-J. Díaz Universidad Industrial de Santander, Bucaramanga, Colombia
  • Jenny-M. Carvajal Ecopetrol – Instituto Colombiano del Petróleo, Piedecuesta, Colombia
  • Miguel-Fernando Palencia-Muñoz Universidad Industrial de Santander, Bucaramanga, Colombia
Keywords: Subcritical fracture index, Stress intensity factor, Critical load speed


This paper  discusses  the  design  methodology  applied to  build  a  testing machine  to  determine  the  sub-critical  fracture  index  in a  rock, based  on  double  torsion  testing in order to characterize  naturally  fractured formations  such  as  those  located  in the  Colombian Llanos Foothill Basin .  These  formations  have  been  subjected  to cyclic loads  over time,  causing  fractures  that  trend  to spread  at sub-critical  stress intensity values.  Similarly,  it  presents  the results of  testing conducted  on  nine  specimens of  the Tambor  Formation  from  2  different  outcrops  to establish  the testing traceability in the equipment.


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How to Cite
Díaz, P.-J. ., Carvajal, J.-M., & Palencia-Muñoz, M.-F. (2011). Double torsion testing machine to determine the subcritical fracture index in rocks. CT&F - Ciencia, Tecnología Y Futuro, 4(3), 37–46.


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