in this paper, a general solution for torsion of hollow cylinders made of functionally graded materials (fgm) was investigated. the problem was formulated in terms of prandtl’s stress and, in general, the shear stress and angle of twist were derived. variations in the material properties such as young’s modulus and poisson’s ratio might be arbitrary functions of the radial coordinate. various m...

in this work, we study a unilateral contact problem with non local friction of coulombbetween a locking material and a rigid foundation. in the first step , we present the mathematicalmodel for a static process, we establish the variational formulation in the form of a variationalinequality and we prove the existence and uniqueness of the solution. in the second step, usingthe penalty method we...

purpose: blast-induced traumatic brain injury (btbi) is one of the causes of death or permanent   invalidity which can occur unexpectedly in both military and civilian populations. this study   set out to conduct a combined eulerian-lagrangian computational analysis of the interaction   between a single planar blast wave and a human head in order to assess the extent of intracranial   shock wav...

Abstract In this study we present a numerical approach to solve steady-state heat conduction problems in functionally graded materials (FGMs). Two different types of material gradations are considered for spatially varying thermal conductivity FGM: (1) Quadratic gradation; (2) Exponential gradation. The proposed procedure is based on finite-difference method and developed the equation over gene...

A component-oriented software system, i.BioMech (image-based biomechanical modeling) is proposed for generation of patient-specific finite element model. It applies a systematic software engineering approach to patient/subject-specific meshing and assignment of material properties. The prototype program is based on the component object model (COM), which enables ease of combination of existing ...

Fast layup and in-situ consolidation capabilities had allowed thermoplastic tape placement techniques to gain considerable appreciation in aerospace and automobile industries. Extensive research had been carried out side by side in theoretical and experimental aspects to realize a tape placement head for producing components with ideal mechanical properties [1]. Experimental parametric studies ...