Abstract-The validity of the parameter (AT), (which was previously introduced by one of the authors), its meaning, and its calculation, in the analysis of cracked bodies under non-steady creep conditions, are studied. Comparisons are made with the widely used parameter C*, which is valid for steady-state creep. An efficient finite element method for general, small-strain, elasticlviscoplastic a...

Accurate predictions of the amount and the rate of long- term deformation of reinforced soils under an applied load are important key issue in geotechnical engineering, in which the deformation of soil develops with time at a state of constant effective stress. Since geosynthetic is generally considered creep sensitive therefore, evaluation of creep behavior of geosynthetic reinforced soil (GRS...

In the present paper, time dependent creep behavior of hollow circular rotating cylinders made of exponentially graded material (EGM) is investigated. Loading is composed of an internal pressure, a distributed temperature field due to steady state heat conduction with convective boundary condition and a centrifugal body force. All the material properties are assumed to be exponentially graded a...

The Galerkin weighted residuals method is extended solve the laminar, fully developed flow and heat transfer of Al2O3-water nanofluid inside polygonal ducts with round corners for the constant heat flux and uniform wall temperature boundary conditions. Using the method, semi-analytical, closed-form solutions are obtained for the friction coefficient and the Nusselt number in terms of the radius...

Using a combination of ellipsometry and friction force microscopy, we study the reversible swelling, collapse and variation in friction properties of covalently bound poly(N-isopropylacrylamide) (PNIPAM) layers on silicon with different grafting densities in response to exposure to good solvents and co-nonsolvent mixtures. Changes in the thickness and segment density distribution of grafted fil...

Creep phenomenon in rock engineering plays a key role in development of underground spaces as they must be stable enough for a long period of time. Current research involved designing and manufacturing of a new creep testing machine. The equipment is capable to perform simultaneous light-duty creep tests on more than one cylindrical rock samples at a very low cost.To evaluate the equipment’s pe...

Results about micromechanical properties (internal friction and creep) of several glasses (metallic, semi-conductor and oxydes glass) are presented : they seem more characteristic of the vitreous state itself than the chemical nature of the glass. The assumption about the formation of shear microdomains leads to the interpretation of the results which might be a contribution to a better knowled...

In some engineering fields, wear resistance and a low friction coefficient are required at the sametime. In this research, PTFE nanoparticles and carbon nanotubes were co-deposited within Ni-Pmatrix to obtain an Ni-P-PTFE-CNT hybrid coating for wear resistance and a low friction coefficient.The tribological properties of the deposits were evaluated by pin on disc tribometer. T...

Skyrmion Motion Understanding skyrmion motion is essential for the efficient operation of skyrmionic devices. In article number 2203275, Chanyong Hwang, Kyoung-Whan Kim, Albert Min Gyu Park, Kab-Jin and co-workers uncover a universal scaling behavior in current-driven skyrmions. The topology shape interface drags skyrmions causes them to show hopping properties distinct from creep expected magn...