Unconfined Compressive Strength Testing
- Rock strength is crucial for designing any field development activity, whether drilling a wellbore, hydraulically fracking or assessing mechanical behavior of a reservoir that is already producing.
- Uniaxial Compressive Strength/ Unconfined Compressive Strength (UCS) test is the simplest of the laboratory geomechanics tests that provide measure of strength and mechanical property (Young’s Modulus and Poisson’s Ratio).
- No confining pressure, no need for pressure vessel - “unconfined” strength.
- The sample diameter can be between 0.75 to 4 inches. with length being twice the sample diameter, per ASTM/ISRM standard.
- The example test shown here reports peak stress achieved during the test as UCS of the rock sample with Young’s Modulus being the slope of the stress-strain plot at linear-elastic region, after closure of micro-cracks (if any) and before yield.
Recommended Sample Dimensions:
- Length: 2” Diameter : 1”
- Length: 3” Diameter: 1.5”