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  • RPI SCOREC - Technical Reports
    each system with ub representing stiff linear springs and unb corresponding to the repulsive portion of the Lennard Jones potential The relaxation of the stress difference following a constant volume elongation of the system is determined in terms of interatomic interactions by nonequilibrium molecular dynamics simulations It is found that the nonbonded interactions make the principal contribution to while the bonds make a negative contribution For all systems studied it

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=75 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    structure upon transition similar to the radial distribution function g r When computed from the nearest nonbonded neighbors the intrinsic distribution is nonuniform due to steric shielding Neighbors at distances larger than a covalent bond length from the representative atom however lead to a uniform distribution g Thus the steric shielding effect generates a nonzero intrinsic deviatoric stress in both equilibrium and nonequilibrium systems while longer range interactions do not

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=76 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    into engineering analyses The objectives of this study are to demonstrate that a transversely isotropic biphasic model of cartilage can provide agreement between predicted regions of high stresses and observed regions of cartilage failure and that with transverse isotropy cartilage stresses are more sensitive to convexity and concavity of the surfaces than with isotropy These objectives are achieved by solving problems of diarthrodial joint contact by the finite element method

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=77 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    map an anisotropic yield surface for a polycrystal to an appropriate isotropic yield surface The transformation developed reflects the symmetry of the material being modeled First the transformation is determined Then information regarding the orientation distribution texture of the crystals in a polycrystalline aggregate is used to determine via averaging the transformation for the polycrystal The transformation along with appropriate isotropic yield surface provides a phenomenological approach to modeling yield

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=78 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    between flexible rubber coated rolls is presented First a finite element analysis of plane strain static contact between rubber coated rolls with thin media in the nip is conducted to determine the relationship between coating indentation and normal load The rubber coatings on each roll are modeled as incompressible hyperelastic materials using a Neo Hookean model Where bearing torque is negligible and the size and angular speed of the rolls is small enough that inertia may be neglected the static load indentation relation is a reasonable approximation of the dynamic load indentation relation Second a numerical analysis of roll core bending under the applied pinching load is used to determine the axial distributions of load and coating indentation and the deformed shape of the roll axes In this analysis the roll cores are modeled as beams and the rubber coatings as springs using the relationship between spring load and rubber coating indentation that was determined in the previous analysis Finally assuming steady rolling and a negligibly small slip region in the contact interface it is expected that the deformation resulting from static indentation at any cross section is very similar to that for the dynamic loading condition The deformation from

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=79 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Mark S Shephard Title Three dimensional Stabilized Finite Element Model for Finite Deformation Processes Year 1999 Pages 365 368 Publisher Constitutive and Damage Modeling of Inelastic Deformation and Phase Transformation Editor A S Khan Abstract A stabilized three dimensional mixed displacement pressure based finite element formulation for modeling large deformation nearly incompressible processes is presented The stabilization is applied to circumvent the Babushka Brezzi criterion which normally must be satisfied

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=80 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    of the Fourth International conference on Constitutive Laws for Engineering Materials Volume July Pages 90 93 Editor R C Picu and E Krempl Abstract A Viscoplastic material model for InP which takes into account the movement and multiplication of dislocations

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=81 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Thin Polycrystalline Films on Substrates Year 1999 Journal Proceedings of the Fourth International conference on Constitutive Laws for Engineering Materials Volume July Pages 229 232 Editor R C Picu and E Krempl Abstract A model for predicting stresses due to thermal loads in textured thin polycrystalline films on substrates with surface passivation layers is presented The model accounts for the behavior of the individual grains and their interactions with the

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=82 (2015-07-15)
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