In order to investigate the behavior of elastoplastic composites exhibiting both isotropic and nonlinear kinematic hardening, we extend Double Incremental Variational (DIV) formulation Lucchetta et al. (2019), based on incremental variational principles introduced by Lahellec Suquet (2007) proposed Agoras (2016). However, Armstrong-Frederick model (Armstrong Frederick), which is very often used...

Most of the observational claims in cosmology are based on the assumption that the universe is isotropic and homogeneous so they essentially test different types of Friedmann models. This also refers to recent observations of supernovae Ia, which, within the framework of Friedmann cosmologies give strong support to negative pressure matter and also weaken the age conflict. In this essay we drop...

Abstract An holistic view is attempted towards prediction of the effect residual stresses induced by full-forward extrusion on fatigue life workpieces during operation. To study constitutive model accuracy forming simulations, a combined nonlinear isotropic/kinematic hardening as well isotropic part same are calibrated based five compression-tension-compression uniaxial stress experiments. A fi...

Advanced hardening models accurately describe the transient plastic behavior (reyielding, stagnation, resumption...) after various strain-path changes (reverse, orthogonal...). However, a common drawback of these is that they usually predict monotonic loading with lower accuracy than regular isotropic models. Consequently, finite element predictions using may sometimes lose in accuracy, spite t...

A solution for the elastoplastic deflection of cantilever beams with linearly variable circular cross-section loaded by shear force at free end, which is suitable practical use, has not yet been developed. semi-analytical such a problem proposed in this paper. The involves made homogenous and isotropic materials bilinear strain hardening behavior. Bernoulli–Euler formula used determining elasti...

The size-dependent response of metallic microwires under monotonic and cyclic torsion is modeled taking a reduced-order strain gradient crystal plasticity approach involving single scalar-valued micromorphic variable. It compared with the predicted by CurlFp model proposed in Kaiser Menzel (2019a), which based on complete dislocation density tensor. shown that, non-uniform plastic deformation p...

The significant influence of transverse isotropy on mechanical behaviours soil has long been recognised, but it is still difficult to capture well under 3D stress conditions. In this study, a method establishing non-orthogonal elastoplastic (NOEP) constitutive models for transversely isotropic (TI-soil) proposed. effect considered by extending the characteristic with fabric tensor TI-soil. exte...

this paper deals with the determination of displacement function and thermal stresses of a finite length isotropic functionally graded hollow cylinder subjected to uniform temperature field. the solution of the governing thermoelastic equation is obtained, as suggested by spencer et al. for anisotropic laminates.  numerical calculations are also carried out for fgm (functionally graded material...