Complete stress-strain curves for various rock types in uniaxial tension

Abstract A simple testing method in uniaxial tension was developed, and uniaxial tension tests of nine Japanese rocks were conducted together with uniaxial compression tests. A closed-loop servo-controlled testing machine was controlled by a method in which a linear combination of stress and strain was used as the feedback signal. It was found that the proposed testing method can be applicable for not only Class I, but also Class II mode failure in tension. Two interesting results were obtained in uniaxial tension: (1) A large amount of residual strength characterises the post-failure region; and (2) the shape of the complete stress-strain curve in tension is similar to that in compression.