Modified Mohr-Coulomb Theory for Triaxial State of Stress
The Mohr-Coulomb failure theory presents the major drawback that can be applied only for plane state of stress. In this paper, we propose a modification of the Mohr-Coulomb theory that might eliminate this disadvantage. It is proposed to replace the three Mohr's circles for spatial state of stress with one “virtual circle” with diameter σ1-σ3±2ρ, concentric with the circle that has the diameter σ1-σ3. The triaxial state of stress and biaxial state of stress are considered to be equivalent dangerous.
Laurentiu Slatineanu, Vasile Merticaru, Florin Negoescu, Margareta Coteata, Razvan Pacurar, Gabriela Strnad, Irina Tita, Gheorghe Oancea, Petru Dusa, Eduard Nitu and Oana Dodun
P. D. Barsanescu et al., "Modified Mohr-Coulomb Theory for Triaxial State of Stress", Applied Mechanics and Materials, Vols. 809-810, pp. 658-663, 2015