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- RPI SCOREC - Technical Reports

matrix where conventional two manifold geometric modeling is not applicable Therefore non manifold geometric modeling providing unified representation of general combinations of 1D 2D and 3D geometric entities is employed in creating the geometry of fiber embedded matrix After the parasolid geometric model is created conforming mesh is generated by using automatic meshing tools Fibers are represented as one dimensional nonlinear springs and the NFM meshed via tetrahedra is modeled as a compressible neo Hookean solid Three dimensional finite element modeling is employed to couple the two tissue components and the resulting representative volume element RVE is subjected to uniaxial tension The overall coupled RVE response yields results consistent with those obtained using a previously developed parallel model based upon superposition The detailed stress field in the composite RVE demonstrates the high degree of inhomogeneity in NFM mechanics which cannot be addressed by a parallel model To gain additional insight in the mechanics of cross linked fiber embedded in matrix a linear material model is also employed to represent both the fibers and matrix and the solution fields are examined for the case of an isotropic network As the matrix modulus increases the network is constrained to deform more affinely

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=614 (2015-07-15)

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matrix where conventional two manifold geometric modeling is not applicable Therefore nonmanifold geometric modeling providing unified representation of general combinations of 1D 2D and 3D geometric entities is employed in creating the geometry of fiber embedded matrix After the parasolid geometric model is created conforming mesh is generated by using automatic meshing tools Fibers are represented as one dimensional nonlinear springs and the NFM meshed via tetrahedra is modeled as a compressible neo Hookean solid Three dimensional finite element modeling is employed to couple the two tissue components and the resulting representative volume element RVE is subjected to uniaxial tension The overall coupled RVE response yields results consistent with those obtained using a previously developed parallel model based upon superposition The detailed stress field in the composite RVE demonstrates the high degree of inhomogeneity in NFM mechanics which cannot be addressed by a parallel model To gain additional insight in the mechanics of cross linked fiber embedded in matrix a linear material model is also employed to represent both the fibers and matrix and the solution fields are examined for the case of an isotropic network As the matrix modulus increases the network is constrained to deform more affinely This

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=615 (2015-07-15)

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488 Abstract A combined experimental and numerical investigation of the flow field in a short rectangular diffusing S shape inlet duct was conducted The inlet duct had a length to hydraulic diameter ratio of 1 5 and an inflow Mach number of 0 44 The flow field was diagnosed utilizing stereoscopic particle image velocimetry surface static pressure measurements and high frequency total pressure measurements both on the lower surface and at the duct s aerodynamic interface plane To complement the experimental investigation and to aid in understanding the flow field associated with this complex geometry a numerical flow simulation was undertaken The flow field exhibited massive flow separations and shear layer formations at both turns of the compact inlet Moreover secondary flow structures along the duct s lower surface and along the duct s side walls were identified It was shown that the two counter rotating flow structures along the duct s lower surface resulted in high levels of total pressure loss at the aerodynamic interface plane A high fidelity spectral analysis of the pressure signals at the aerodynamic interface plane and along the lower surface was conducted and demonstrated that a high frequency surface static pressure sensor could identify

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=623 (2015-07-15)

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This article presents a parallel algorithm of creating and deleting data copies referred to as ghost copies which localize neighborhood data for computation purposes while minimizing inter process communication The key characteristics of the algorithm are 1 It can create ghost copies of any permissible topological order in a 1D 2D or 3D mesh based on selected adjacencies 2 It exploits neighborhood communication patterns during the ghost creation process thus

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=626 (2015-07-15)

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Letters Abstract The elastic modulus of two dimensional random fibre networks is determined for structures in which the degree of cross linking is varied The relationship between the network parameters fibre axial and bending stiffness fibre density and degree of cross linking and the overall elastic modulus is discussed and presented in terms of a master curve It is shown that master curves for sparsely cross linked networks with various

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=631 (2015-07-15)

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cores from the shuffle to the glide set of 111 glide planes in Si is examined in this work The transformation is thermally activated and is favored by a resolved shear stress which applies no force on the original perfect shuffle dislocation A resolved shear stress driving dislocation motion in the glide plane is not observed to promote the transition The stress dependent activation energy for the described shuffle glide

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=632 (2015-07-15)

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plane and of strain applied normal to the glide plane to defining the Peierls stress are analyzed The analysis is performed using a combination of atomistic simulations and the Peierls Nabarro model based on generalized stacking faults It is shown that a shear strain acting in the direction of the Burgers vector decreases the Peierls stress and the effect is due to the reduction of the shear modulus Bonding across

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=633 (2015-07-15)

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a series of graphene oxide frameworks GOFs using first principles calculations based on density functional theory The molecular structure of GOFs is systematically studied by varying the nature and concentration of linear boronic acid pillars and the thermal stability is assessed using ab initio molecular dynamics The results demonstrate that GOFs are thermally stable up to 550 K and that electronic properties such as their band gap can be modified

Original URL path: http://www.scorec.rpi.edu/reports/view_report.php?id=644 (2015-07-15)

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