ASTM D3967-16 PDF Download

ASTM D3967-16 is a standard test method that determines the splitting tensile strength of intact rock core specimens. The method is an alternative to the direct tensile test, which is difficult and expensive for routine application. The splitting tensile test is simpler, more cost-effective, and can provide representative results under complicated stress fields commonly encountered in rock mechanics design.

The test involves compressing disk-shaped rock specimens diametrically. Testing is conducted across different diametrical directions to determine possible variations in tensile strength for anisotropic rocks. The purpose of establishing a uniform test method is to ensure that the disk specimens break diametrically due to tensile stresses perpendicular to the loading diameter. This helps to ensure the comparability of data obtained from different tests.

The standard emphasizes that the reliability of the results obtained depends on the competence of the personnel performing the test, as well as the suitability of the equipment and facilities used. Compliance with other relevant ASTM standards, such as Practice D3740, which evaluates factors contributing to reliable testing and sampling, is recommended but does not guarantee reliable results.

Additionally, the standard provides guidelines for significant digits and rounding of observed and calculated values, as established in Practice D6026. These procedures are considered the industry standard, but it is important to note that they do not consider material variation, special purpose studies, or the user's objectives. Significant digits may be increased or reduced in reported data to align with these considerations. The standard does not address significant digits used in engineering design analysis methods.