A method for testing and calibrating tissue equivalent proportional counters with 37At is described. 37Ar is produced by exposure of argon in its normal isotope composition to thermal neutrons. It is shown that up to volume ratios of 0.01 of argon to the tissue equivalent gas there is no appreciable effect of the argon admixture on the function of the proportional counter. Conventional calibrat...

A new computational mechanics model is proposed to describe the compression response of two-dimensional cellular materials with consideration of microstructural development. In this modeling, processing conditions to fabricate cellular materials are taken into account as a cell-growth mechanism. Representative volume elements (RVE) are generated by the phase-field model. Numerical simulations o...

Anisotropic, elasto-viscoplastic behaviour in polycrystalline materials is modelled using a new, updated Lagrangian formulation based on a three-field form of the Hu-Washizu variational principle to create a stable finite element method in the context of nearly incompressible behaviour. The meso-scale is characterized by a representative volume element, which contains grains governed by single ...

Shock Wave Propagation in Cementitious Materials at Micro/Meso Scales Report Title Shock wave response of heterogeneous materials like cement and concrete is greatly influenced by the constituents and their statistical distributions. The microstructure of cement is complex due to the presence of unhydrated water, nano/micro pores, and other hydrated and unhydrated products, such as the C-S-H ge...

A three-dimensional multi-scale discrete–continuum model (Finite Volume Method × Discrete Element Method, FVM DEM) is developed for a discrete-based description of the mechanical behavior granular soils in boundary value problems (BVPs). In such scheme, constitutive response material derived through direct DEM computations on representative volume element attached to each mesh element. The appr...

In this paper, we present a general derivation of multicontinuum equations and discuss cell problems. We constraint problem formulations in representative volume element oversampling techniques that allow reducing boundary effects. different choices constraints for numerical results show how reduces Finally, the relation proposed methods to our previously developed methods, Nonlocal Multicontin...