A rock core sample is cut to length and its ends are cemented to metal caps. The metal caps are attached to a testing machine and the specimen is loaded in tension until it fails. Rock is much weaker in tension than in compression. Thus, in determining the failure condition for a rock structure, many investigators employ tensile strength for the structure. Direct tensile stressing of rock is the most basic test for determining the tensile strength of rock.
Enough samples to represent a valid average of the type of rock under consideration
Right circular cylinder, with diameter of at least 1 7/8 in and a length to diameter ratio of 2 to 2.5:1
Rock, Rock Tensile Strength, Tension Properties, Tension Tests, direct tension