This paper proposes a framework for the constitutive model based on the semi-micromechanical aspects of plasticity, including damage progress for simulating behavior of concrete under multiaxial loading. This model is aimed to be used in plastic and fracture analysis of both regular and reinforced concrete structures, for the framework of sample plane crack approach. This model uses multilamina...

For metals it is widely accepted that the stress-strain diagram is symmetric with regard to tension and compression when plotted in terms of true rather than nominal quantities. Kinematic considerations state that the engineering definition of nominal strain exhibits fundamental deficiencies under rigid body rotations and deformations which are not truly infinitesimal. For these two reasons the...

Dynamic recrystallization, DRX, behaviour of a precipitation hardened, PH, stainless steel was studied in connection with microstructural developments in a compression test. The experimental results showed that the dominant mechanism of softening is DRX, but at high strain rates and low temperatures, ie, high Zener-Holman parameter, Z, work hardening and dynamic recovery, DRV, produced a pancke...

For crystal plasticity formulation neglecting the strain gradients at dislocation scale, backstresses are necessary to satisfy mesoscopic stress equilibrium and compatibility requirements. Backstresses in a material point those between neighboring points treated separately. Physically can dynamically induce either hardening or softening effects adjust of slip systems, whereas sum stresses resul...

We ascertain the effect of thermal conducive on the initiation and growth of shear bands in a structural steel by analyzing the development of shear bands in a block undergoing overall adiabatic simple shearing deformations. The material of the block is assumed to exhibit strain and strain-rate hardening, and thermal softening. Three constitutive relations, namely, the Litonski law, the Bodner-...

A constitutive model based on plasticity theory with a non-associative flow rule has been developed. The model is formulated in terms of sleeper displacements and forces, and includes hardening and softening controlled by irreversible transversal (lateral and longitudinal) sleeper displacements. The model has been calibrated using results from lateral and longitudinal ballast resistance tests c...