Techno Press
Techno Press

Geomechanics and Engineering   Volume 12, Number 6, June 2017, pages 883-898
Dog bone shaped specimen testing method to evaluate tensile strength of rock materials
Eren Komurlu, Ayhan Kesimal and Aysegul Durmus Demir

Abstract     [Full Text]
    To eliminate the holding and gluing problems making the direct tensile strength test hard to be applied, a new method of testing specimens prepared using lathe machine to make the dog bone shape is assessed whether it could be applied to determine accurate direct tensile strength values of rock materials. A series of numerical modelling analyses was performed using finite element method to investigate the effect of different specimen and steel holder geometries. In addition to numerical modelling study, a series of direct tensile strength tests was performed on three different groups of rock materials and a rock-like cemented material to compare the results with those obtained from the finite element analyses. A proper physical property of the lathed specimens was suggested and ideal failure of the dog bone shaped specimens was determined according to the results obtained from this study.
Key Words
    tensile strength; rock testing; direct tensile strength test for rock materials; static loading
(1) Eren Komurlu, Ayhan Kesimal:
Department of Mining Engineering, Karadeniz Technical University, Trabzon, Turkey;
(2) Aysegul Durmus Demir:
Department of Civil Engineering, Karadeniz Technical University, Trabzon, Turkey.

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