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  • RPI SCOREC - Technical Reports
    bodies connected together by kinematic joints to form single or coupled closed loop topologies The algorithm is exact and non iterative The constraints are imposed at the acceleration level by utilizing a kinematic relation between the joint motion subspace or partial velocities and its orthogonal complement Sample test cases indicate excellent constraint satisfaction and robust handling of singular configurations Since the present algorithm does not use either a reduction or

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=444 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    superposition and body substructuring with arbitrarily large rotations and translations The large rotations or translations are modelled as rigid body degrees of freedom associated with the interconnecting kinematic joint degrees of freedom The elastic deformation of the component bodies is modelled through the use of modal coordinates and associated admissible shape functions Apart from the approximation associated with the elastic deformations this algorithm is exact non iterative and applicable to

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=445 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Abstract This paper introduces POEMS parallelizable open source efficient multibody software as a modular research package being developed to serve as a backbone software for collaborative research in multibody dynamics POEMS aims to serve as a repository of efficient implementations of relevant algorithms and be applied to varied applications of interest in research academia and industry It allows the user to model systems with varied topologies and choose between different

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=446 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    Dynamics of attachment detachment processes of chains to from spherical fillers in a polymer nanocomposite is investigated by means of numerical simulations using a chemistry specific model for the polymer The effects of polymer particle interaction chain length chain to filler distance and filler radius on the attachment detachment processes are studied It is found that the time a chain is in contact with a filler scales with the number

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=447 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    uid ow and interstitial uid drainage on the spatio temporal response of soft tissue strain The motivation stems from the ability to measure in vivo strain distributions in soft tissue via elastography and the desire to explore the possibility of using such techniques to investigate soft tissue uid ow Our study is based upon a mathematical model for soft tissue mechanics from the literature It is a simple generalization of biphasic theory that includes coupling between the uid and solid phases of the soft tissue and crucially uid exchange between the interstitium and the local microvasculature We solve the mathematical equations in two dimensions by the nite element method FEM The nite element implementation is validated against an exact analytical solution that is derived in the appendix Realistic input tissue properties from the literature are used in conjunction with FEM modeling to conduct several computational experiments The results of these lead to the following conclusions i di erent hypothetical ow mechanisms lead to di erent patterns of strain relaxation with time ii representative tissue properties show uid drainage into the local microvasculature to be the dominant ow related stress strain relaxation mechanism iii the relaxation time of strain in solid

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=448 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    a For μ known apriori λ is determined by a single deformation eld up to a constant b Conversely for known apriori μ is determined by a single deformation eld up to a constant This includes as a special case that for which the term λ c Finally if neither λ nor μ is known apriori but Poisson s ratio is known then μ and λ are determined by a

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=449 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    eliminate the need for boundary conditions in the inverse problem The hydrostatic stress pressure is also reconstructed in the process and the effect of neglecting this term in the governing equations which is common practice is considered The approach does not require iterations and can be performed on sub regions of the domain resulting in a computationally efficient method A sensitivity study is performed to investigate the detectability of abnormal

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=450 (2015-07-15)
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  • RPI SCOREC - Technical Reports
    and efficiently compute key flow quantities especially near wall quantities like wall shear stress The new adaptive approach uses local mesh modification procedures in a manner that maintains layered and graded elements near the walls which are popularly known as boundary layer or semi structured meshes with highly anisotropic elements of mixed topologies The technique developed is well suited for viscous flow applications where exact knowledge of the mesh resolution

    Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=451 (2015-07-15)
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