Complex triaxial stress states are present in many reinforced concrete structures. These structures often analyzed using simple hand calculations based on methods designed for plane However, this can result designs that inefficient and excessive material usage. This paper introduces finite-element limit analysis (FELA) modeling of structures, with separate reinforcement a so far unseen scale. T...

Experimental data have demonstrated that a strong relationship exists between the state parameter and peak strength dilatancy characteristics of sands. This paper proposes way reproducing this behaviour using modified Mohr-Coulomb failure criterion, which retains its simplicity while improving substantially modelling capabilities. The formulated constitutive model is calibrated for Nevada sand ...

A new dynamic friction model for modeling of elliptical vibration assisted turning (EVAT) was developed in this research. The periodic change of the friction force direction is known to be one of the most important causes of this phenomenon. In modeling of machining processes (including the EVAT process), static Coulomb friction model was employed by most of the researchers. Because of the peri...

Based on the finite element limit analysis method, stability of face in case active failure under three constitutive models, Mohr-Coulomb model (MC), modified Cambridge (MCC) and Drucker-Prager (DP), were analyzed. The ultimate support pressure influence factors such as different burial depth ratios ( C/D ), cohesion c ) friction angle φ MC are also discussed. results show that safety factor ob...

A new failure criterion was presented to predict the ultimate strength of shale under the triaxial and polyaxial state of stress. A database containing 93 datasets was obtained from the results of the uniaxial, triaxial, polyaxial compressive tests, an indirect tensile test was collected from reliable references, and this test was carried out on the shale samples taken from the southwestern oil...

Buckle folds are common traps for hydrocarbon in several contractional provinces. Buckle folds form where stratified sequences rest a top salt or some other utterly weak rock as a decollemet zone in units with high competency contrasts by a compressive stress which acted along the length of the rock layers. An important parameter affecting buckle folding of a competent zone above a mobile decol...

a new dynamic friction model for modeling of elliptical vibration assisted turning (evat) was developed in this research. the periodic change of the friction force direction is known to be one of the most important causes of this phenomenon. in modeling of machining processes (including the evat process), static coulomb friction model was employed by most of the researchers. because of the peri...