• Aggarwal, Vanita
• Kumar, Parveen

Abstract

Background technologyIn the field of rock mechanics, the most popular method for indirect tensile testing, such as the Brazilian indirect tensile strength test, involves using disc-shaped specimens to calculate the tensile strength of rock samples. However, during this testing procedure, researchers have observed the generation of compressive and shear stresses at the contact area between the specimen and the loading jaw of the testing machine. This has led to overestimated results. To address this issue, ring-shaped specimens were introduced. Nevertheless, in direct tensile testing machines, a gap between the contact area of the loading jaw and the specimen leads to inaccurate tensile strength measurements. Additionally, the angular movement of the disc during the loading process results in shear stresses, as the failure does not occur along the vertical or principal plane. The primary objective of this invention is to overcome these difficulties. This is achieved by minimizing the gap between the loading jaw and the specimen and preventing the angular movement of the disc during the loading procedure, all while maintaining ease of use. DescriptionA kind of Ring-Shaped sample designed for use in a direct tensile testing machine. Invention Field The present invention relates to a kind of ring-shaped rock specimen designed for use in direct tensile test machine for testing the tensile strength property of rock material property. Summary of the invention The objective of this invention is to offer a specific type of ring-shaped specimen tailored for use in a direct tensile testing machine. The primary aim of the present innovation is to address the issue of overestimated experimental results in direct tensile testing for rock specimens. This is achieved by reducing the gap between the loading jaws and the specimen's contact area by incorporating grooves in opposite directions on the inner side of the ring-shaped specimen, located at the vertical plane. These grooves, cut into the inner diameter of the ring-shaped specimen, serve to snugly accommodate both the fixed and movable loading jaws of the testing machine, minimizing the gap between the loading jaws and the specimen's contact area. Furthermore, these groove cuts prevent angular movement during the testing procedure, ensuring that the specimen fails along its principal plane.

Topics

• impedance spectroscopy
• strength
• tensile strength