Constitutive and closure models play important roles in computational mechanics physics general. Classical constitutive for solid fluid materials are typically local, algebraic equations or flow rules describing the dependence of stress on local strain and/or strain-rate. Closure such as those Reynolds turbulent flows laminar--turbulent transition can involve transport PDEs (partial differentia...

Among the intermolecular interactions, the Casimir and van der Waals forces are the most important forces that highly affect the behavior of nanostructures. This paper studies the effect of such forces on the adhesion of cantilever freestanding nanostructures. The nanostructures are made of a freestanding nano-beam which is suspended between two upper and lower conductive surfaces. The linear s...

ABSTRACT: The mechanical parameters of constitutive equations for soil and rock can be determined by laboratory experiments in which a cylindrical specimen is commonly tested under uniaxial and triaxial compressive conditions. The distribution of stress in the specimen during the tests must be kept uniform and homogeneous. In this paper, numerical simulations are carried out to determine the di...

among the intermolecular interactions, the casimir and van der waals forces are the most important forces that highly affect the behavior of nanostructures. this paper studies the effect of such forces on the adhesion of cantilever freestanding nanostructures. the nanostructures are made of a freestanding nano-beam which is suspended between two upper and lower conductive surfaces. the linear s...

In order to describe the thermomechanical behavior of landfills, a constitutive model based on the macromechanical Theory of Porous Media (TPM) for a saturated thermoelastic porous body has been developed. The body under investigation consists of an organic and inorganic solid phase and a gas phase. All interaction relations between the constituents such as mass transfers, interaction forces an...

A new piezoelectric-based mechanism was proposed, modeled and tested. This mechanism was basically designed to be periodically excited while in contact with a driven surface. Two piezoelectric elements located by the angle of 901 relative to each other are used to create elliptical motion on tip of the mechanism depending on the applied phase difference. In order to ensure the designated ellipt...

Computational modeling of thin biological membranes can aid the design of better medical devices. Remarkable biological membranes include skin, alveoli, blood vessels, and heart valves. Isogeometric analysis is ideally suited for biological membranes since it inherently satisfies the C1-requirement for Kirchhoff-Love kinematics. Yet, current isogeometric shell formulations are mainly focused on...

There is increasing interest in the use of iterative rather than direct solvers for geotechnical finite element analysis. For large 3D problems iterative solvers offer the only possibility of economical solution on a desktop PC. The major stumbling block with iterative solvers is ensuring fast convergence to a suitably accurate solution. The system of equations is always “preconditioned” to imp...

This work considers a viscoelastic fluid membrane which is initially tubular and bonded at each end to a rigid circular disc. The membrane is subjected to prescribed elongational and internal pressure histories causing it to undergo quasi-static axisymmetric deformation. This example is intended to simulate an experiment which has been recently proposed for the determination of constitutive pro...