We study the spatially uniform case of the problem of quasistatic evolution in small strain nonassociative elastoplasticity (Cam-Clay model). Through the introdution of a viscous approximation, the problem reduces to determine the limit behavior of the solutions of a singularly perturbed system of ODE’s in a finite dimensional Banach space. Depending on the sign of two explicit scalar indicator...

The behavior of fiber reinforced cement composites (FRCC) can be described and quantified by a variety of parameters, such as strength and strain capacity, toughness index, and fracture energy, obtained from tests in tension or bending in a large number different configurations including varying specimen geometries and test setups. Depending on the details of the individual testing procedures, ...

Abstract. In the accumulation zone of glaciers and ice sheets snow is transformed into glacial by firn densification. Classically, this process assumed to solely depend on temperature overburden pressure, which controlled rate. However, exceptionally thin layers have been observed in high-strain shear margins streams. Previously, it has proposed that thinning can be explained an enhancement den...

This study is devoted to the mechanical behavior of polycrystalline materials with two populations of voids, small spherical voids located inside the grains and larger spheroidal voids located at the grain boundaries. In part I of the work, instantaneous effective stress-strain relations were derived for fixed microstructure. In this second part, the evolution of the microstructure is addressed...

This paper presents a methodology to simulate the strain-softening-hardening response of sensitive clays when subjected extensive remoulding. A non-local strain-softening technique is implemented into Abaqus Finite Element Analysis (FEA) software through its user defined material subroutine UMAT, in form critical state based constitutive model. For comparison conventional and formulations, seri...

Abstract We present a constitutive model for particle-binder composites that accounts finite-deformation kinematics, nonlinear elasto-plasticity without apparent yield, cyclic hysteresis, and progressive stress-softening before the attainment of stable response. The is based on deformation mechanisms experimentally observed during quasi-static monotonic compression mock Plastic-Bonded Explosive...