An elastic-viscoplastic constitutive material model is developed for the representation of creep response a 10%Cr steel under cyclic loading conditions. It has been shown that able to describe primary regeneration (PCR), i.e. incidence period high strain rate following stress reversal. The variant well-known Chaboche viscoplastic model, and employs bi-term power-law equation represent stress-re...

Abstract: This paper builds upon previous studies (Farrugia, 2006, 2008) for developing a more physical approach to predict the mechanisms of high temperature ductile damage acting at surface/sub-surface and across the length scale of continuously cast free cutting steel billet feedstock. A methodology combining mechanical testing and modelling has been developed to account for local microstruc...

The propagation of steady plane shock waves in metallic materials is considered. Following the constitutive framework adopted by R. J. Clifton @Shock Waves and the Mechanical Properties of Solids, edited by J. J. Burke and V. Weiss ~Syracuse University Press, Syracuse, N.Y., 1971!, p. 73# for analyzing elastic–plastic transient waves, an analytical solution of the steady state propagation of pl...

Effect of micro-aeration on the mechanical response chocolate is investigated and data are used to calibrate a viscoplastic constitutive model. The link between laboratory measurements, in vivo mastication data, texture highlighted.

In tensile tests the PP/flax fiber composites clearly shows a nonlinear behavior in loading and hystheresis loops in unloading. In creep tests performed at different load levels the response was nonlinear viscoelastic, and after recovery, viscoplastic strains were detected. No degradation in stiffness could be seen and thus nonlinear viscoelasticity and viscoplasticity were assumed to be the ma...

We analyse through numerical simulations, experiments, and scaling laws the dam-break problem for viscoplastic materials. Numerically, both two three-dimensional (2D 3D) scenarios are considered thanks to a proposed adaptive stabilized finite element framework able compute efficiently free surface flows of highly choose focus on Bingham model. Momentum mass equations solved by using Variational...

Flows of dense granular materials comprise regions where the material is flowing, and regions where it is static. Describing the dynamics of the interface between these two regions is a key issue to understanding the erosion and deposition processes in natural environments. A free interface simplified model for non-averaged thin-layer flows of granular materials has been previously proposed by ...