Material characterisation is often performed by uniaxial loaded cylindrical specimens. When the material in question is anisotropic in nature, the transverse behaviour of these specimens is recorded and analysed with respect to the material orientation to determine the relevant material properties for development of constitutive models. During low strain rate testing, measurements of the transv...

Single crystals of YBa2Cu30,, of various oxygen stoichiometries, were irradiated with 50 keV Kr' to create defect cascades similar to those resulting from fast neutron irradiation. Two-beam dark-field transmission electron microscopy in weak dynamic conditions was used to measure the defect cascade size distribution in the principal axes for four different oxygen stoichiometries, and high-resol...

An attempt has been made to develop a seminumerical model to study temperature variations in dermal layers of human limbs. The model has been developed for two dimensional steady state case. The human limb has been assumed to have elliptical cross section. The dermal region has been divided into three natural layers namely epidermis, dermis and subdermal tissues. The model incorporates the effe...

Dielectric microcavities based on cylindrical and deformed cylindrical shapes have been employed as resonators for microlasers. Such systems support spiral resonances with finite momentum along the cylinder axis. For such modes the boundary conditions do not separate and simple TM and TE polarization states do not exist. We formulate a theory for the dispersion relations and polarization proper...

Abstract An accurate frequency domain model is proposed to analyze the seismic response of uniform vertical cylinders with arbitrary cross section surrounded by water. According boundary conditions and using variables separation method, modes hydrodynamic pressure are firstly obtained. Secondly, three-dimensional wave equation can be simplified a two-dimensional Helmholtz equation. Introducing ...

Abstract This historical moment is characterized by a great awareness regarding the need to reduce Greenhouse Gas emissions (GHG), which are responsible for climate change and its detrimental consequences. Green hydrogen produced means of Power-to-Gas technologies from renewables gaining momentum as possible clean fuel future mobility. In such context, traditional injectors hydrocarbon fuels cu...

The present paper deals with numerical comparison of two twist-based severe plastic deformation processes: (i) the elliptical cross-section spiral equal-channel extrusion (ECSEE) proposed recently as a novel process and (ii) the classical twist extrusion (TE). ECSEE was developed in attempt to process cylindrical work pieces and to generate more uniform strain distribution compared to classical...

This paper investigates the propagation of an air finger into a fluid-filled, axially uniform tube of elliptical or rectangular cross section with transverse length-scale a and aspect ratio α. Gravity is assumed to act parallel to the tube’s axis. The problem is studied numerically by a finite-element-based direct solution of the freesurface Stokes equations. In rectangular tubes, our results f...

We discuss the possibility of recording state in-situ stress in shape a rock core that is sampled using modified drilling method. This concept based on phenomenon cylindrical rock-core expands radially into slightly elliptical along its transverse cross-section when sample relieved anisotropic by drilling. The magnitudes and orientation stresses can, principle, be estimated from circumferential...