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  • RPI SCOREC - Technical Reports
    isotropic solid Alternate mixed penalty and velocity pressure finite element formulations are used to solve the nonlinear biphasic governing equations including the effects of a strain dependent permeability and a hyperelastic solid phase under finite deformation The resulting first order nonlinear system of equations are discretized in time using an implicit finite difference scheme and solved using the Newton Raphson method A significant contribution of this work is the implementation

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=152 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    complex numerical simulation of human joints a finite element formulation for contact between layers of articular cartilage has been developed A biphasic description of the cartilage is used where the material is considered to be a porous permeable solid matrix with fluid flowing through it Governing equations and contact boundary conditions are summarized for this material before developing the finite element formulation from a Galerkin weighted residual statement Lagrange multipliers

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=153 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    layer and grain boundaries as well as due to hardening on the slip system themselves are considered and incorporated into the model Using this model the predicted stress temperature curves for aluminum films with a natural oxide layer are in good agreement with the measured curves especially for thicker films It was found that the predictions of stress temperature curves for fiber textured films are not substantially affected by reasonable

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=154 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Abstract Structural defects in MLEK grown InP single crystals have been studied using synchrotron white beam X ray topography Results here are represented for both a S doped boule which was wafered longitudinally i e parallel to the growth axis and a Fe doped boule which was wafered laterally i e perpendicular to the growth axis For longitudinal wafers from the S doped boule slip bands were observed to have nucleated from high stress concentration located at the peripheral regions of the boule and to have propagated into the interior of the samples In the same crystals the growth interface morphology at different stages of crystal growth was determined The interface is revealed as contours of equal lattice parameter visible via strain contrast as the concentration of the dopant changed periodically during growth The interface shape was observed to be slightly convex to the melt once the growth conditions were stabilized For the laterally sliced wafers from the Fe doped boule systematic studies revealed that the density of dislocations changed during growth A high density of uniformly distributed dislocations were observed in wafers taken from the early and later stages of growth On the other hand dislocations in well defined

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=155 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    InP single crystal boules Wafers cut both longitudinally and laterally with respect to the growth axis were studied in order to reveal the overall defect distribution in the boules Studies carried out on longitudinally cut S doped crystals enabled information to be obtained on interface shape from the observation of growth striations as well as defect distribution The conditions for optimal visibility of the growth striations were determined and it was found that the morphology of the growth interface was a sensitive function of local growth conditions The formation of extensive slip bands from peripheral regions was also observed This indicates that large thermal stresses were generated during crystal growth leading to such significant plastic deformation processes Studies carried out on a series of laterally sliced Fe doped wafers cut from the same boule revealed dislocations in well defined fourfold symmetric distributions A Finite element thermal elastic stress analysis was performed for an intermediate growth stage to investigate the nature of the stress which causes this fourfold distribution The calculated excess shear stress from this analysis agrees qualitatively with the observed dislocation distribution and slip system activity The influence of an applied magnetic field on precipitate distributions in InP boules

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=156 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    materials where the forming process can be approximated as steady The design parameters are the process geometry and in some cases the speed The material property of interest is a scalar internal variable which is meant to represent the state of the material The tool shape optimization described in this study is the nonlinear inverse problem that determines the two dimensional forming geometry used to satisfy a specified design criterion

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=157 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Editor A M Maniatty Abstract The statistical analysis of the recovery of boundary traction information in linear elasticity is considered Specifically the statistical analysis carried out in 8 is extended to include modelization error The general approach used here is based on Bayesian statistics and was developed in 1 Specifically a Gaussian probability density function is used to describe the forward problem of obtaining internal strains or displacements from a

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=159 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    an important but unexplored class of CA in which the cells interaction domain extends beyond the nearest neighbors The computational power necessary to run large scale CA and GCA models has only recently been available thanks to parallel processing This paper focuses on implementation and performance of GCA in biological modeling In particular we present results of simulating the spread of epidemics and the creation of spatial infection patterns that

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=160 (2015-07-15)
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