The deformation and recrystallization mechanisms which control the viscoplasticity of ice from polar ice sheets have been investigated. The high plastic anisotropy of ice crystals is responsible for the development of a non uniform internal stress field within the polycrystal. Strain-shadows produced by sub-grain are observed in polarized light when the rotation recrystallization regime is domi...

In recent years, the phase-field method has attracted a lot of attention and emerged as one most efficient tools for modeling fracture phase transformation. The is based on regularization discontinuities which allows resolution complex problems using classical numerical methods. A multiphase-field model essential describing crack propagation in non-static heterogeneous materials still missing. ...

Local damage models are known to produce pathological mesh dependence in finite element simulations. The solution is to either use a regularization technique or to adopt a non-local damage model. Viscoplasticity is one technique which can regularize the mesh dependence of local damage model by incorporating a physical phenomenon in the constitutive model i.e. rate effects. A detailed numerical ...

It is commonly known that cortical bone exhibits viscoelastic-viscoplastic behavior which affects the biomechanical response when an implant is subjected to an external load. In addition, long term effects such as creep, relaxation and remodeling affect the success of the implant over time. Constitutive material models are commonly derived from data obtained in in vitro experiments. However dur...

Nanofluids play an important role in many different industries for improvement of heat transfer. The modeling and simulation such fluids is developing continuously. Two models studying nanofluids are mixture (or single-phase) two-phase Buongiorno) forms, which have been examined various ways. Non-Newtonian behavior (shear-thinning viscoplasticity) has observed experimental tests simulated sever...

The paper presents a gradient enhanced model dealing with nonlocal phenomena driven by the ductile damage in semicrystalline polymers that exhibit rate-dependent and rate-independent mechanisms. study aims at capturing material localization high levels. To this end, viscoelastic-viscoplastic constitutive is formulated considering thermodynamic potential, function of local state variables. based...

Finite element simulation of the column bending test (CBT) is carried out using shell elements with anisotropic viscoelastic section properties. The CBT an experimental method for evaluating behavior thin-ply high strain composites (TP-HSC), to support development deployable composite booms space structures. A linear formulation derived and implemented two solution techniques: quasi-elastic (QE...

ABSTRACT Non-Newtonian rheology effects, such as pseudoplasticity and viscoplasticity, are understood shear stresses, incorporated to the energy slope term in Shallow-Water Equations (SWE). However, non-Newtonian stresses dependent of rate, whose formulation is a function gradient velocity profile bottom. This study investigated two rate formulations that commonly applied SWE literature: 1) non...