The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform

S O Kucheyev - One of the best experts on this subject based on the ideXlab platform.

  • effects of collision cascade density on radiation defect dynamics in 3c sic
    Scientific Reports, 2017
    Co-Authors: L Bayu B Aji, J B Wallace, S O Kucheyev
    Abstract:

    Effects of the collision cascade density on radiation damage in SiC remain poorly understood. Here, we study damage buildup and defect interaction dynamics in 3C-SiC bombarded at 100 °C with either continuous or pulsed beams of 500 keV Ne, Ar, Kr, or Xe ions. We find that bombardment with heavier ions, which create denser collision cascades, results in a decrease in the dynamic annealing efficiency and an increase in both the amorphization Cross-Section Constant and the time Constant of dynamic annealing. The cascade density behavior of these parameters is non-linear and appears to be uncorrelated. These results demonstrate clearly (and quantitatively) an important role of the collision cascade density in dynamic radiation defect processes in 3C-SiC.

J B Wallace - One of the best experts on this subject based on the ideXlab platform.

  • effects of collision cascade density on radiation defect dynamics in 3c sic
    Scientific Reports, 2017
    Co-Authors: L Bayu B Aji, J B Wallace, S O Kucheyev
    Abstract:

    Effects of the collision cascade density on radiation damage in SiC remain poorly understood. Here, we study damage buildup and defect interaction dynamics in 3C-SiC bombarded at 100 °C with either continuous or pulsed beams of 500 keV Ne, Ar, Kr, or Xe ions. We find that bombardment with heavier ions, which create denser collision cascades, results in a decrease in the dynamic annealing efficiency and an increase in both the amorphization Cross-Section Constant and the time Constant of dynamic annealing. The cascade density behavior of these parameters is non-linear and appears to be uncorrelated. These results demonstrate clearly (and quantitatively) an important role of the collision cascade density in dynamic radiation defect processes in 3C-SiC.

J. Dario Aristizabal-ochoa - One of the best experts on this subject based on the ideXlab platform.

  • Second-order Stiffness Matrix and Loading Vector of a Tapered Rectangular Timoshenko Beam-column With Semirigid Connections
    Structures, 2018
    Co-Authors: Alejandro Palacio-betancur, J. Dario Aristizabal-ochoa
    Abstract:

    Abstract The second-order stiffness matrix and loading vector of a linearly tapered Timoshenko beam-column with rectangular Cross-Section, Constant width and generalized end conditions subject to a Constant axial load is derived. The proposed model includes the simultaneous effects of: (1) axial load (tension or compression) applied at both ends; (2) transverse load; (3) generalized end conditions; (4) bending and shear deformation along the member; (5) shear stress correction factor induced by the tapering of the cross section; and (6) the shear force induced by the applied axial load as the member deflects laterally using two different approaches, those by Engesser and Haringx which are proportional to the total slope (dy/dx) and to the angle of rotation (θ) along the span of the member, respectively. The governing differential equations are solved by the power series method. The concept of fixity factor of tapered Timoshenko beam-columns with semirigid end connections is introduced. The proposed method and corresponding equation are capable of determining the static and stability behavior of elastic framed structures made of tapered beam-columns with semi-rigid connections using a single segment per element. Three comprehensive examples are presented that show the accuracy and validity of the proposed method and the calculated results are compared with those obtained using ABAQUS.

L Bayu B Aji - One of the best experts on this subject based on the ideXlab platform.

  • effects of collision cascade density on radiation defect dynamics in 3c sic
    Scientific Reports, 2017
    Co-Authors: L Bayu B Aji, J B Wallace, S O Kucheyev
    Abstract:

    Effects of the collision cascade density on radiation damage in SiC remain poorly understood. Here, we study damage buildup and defect interaction dynamics in 3C-SiC bombarded at 100 °C with either continuous or pulsed beams of 500 keV Ne, Ar, Kr, or Xe ions. We find that bombardment with heavier ions, which create denser collision cascades, results in a decrease in the dynamic annealing efficiency and an increase in both the amorphization Cross-Section Constant and the time Constant of dynamic annealing. The cascade density behavior of these parameters is non-linear and appears to be uncorrelated. These results demonstrate clearly (and quantitatively) an important role of the collision cascade density in dynamic radiation defect processes in 3C-SiC.

Alejandro Palacio-betancur - One of the best experts on this subject based on the ideXlab platform.

  • Second-order Stiffness Matrix and Loading Vector of a Tapered Rectangular Timoshenko Beam-column With Semirigid Connections
    Structures, 2018
    Co-Authors: Alejandro Palacio-betancur, J. Dario Aristizabal-ochoa
    Abstract:

    Abstract The second-order stiffness matrix and loading vector of a linearly tapered Timoshenko beam-column with rectangular Cross-Section, Constant width and generalized end conditions subject to a Constant axial load is derived. The proposed model includes the simultaneous effects of: (1) axial load (tension or compression) applied at both ends; (2) transverse load; (3) generalized end conditions; (4) bending and shear deformation along the member; (5) shear stress correction factor induced by the tapering of the cross section; and (6) the shear force induced by the applied axial load as the member deflects laterally using two different approaches, those by Engesser and Haringx which are proportional to the total slope (dy/dx) and to the angle of rotation (θ) along the span of the member, respectively. The governing differential equations are solved by the power series method. The concept of fixity factor of tapered Timoshenko beam-columns with semirigid end connections is introduced. The proposed method and corresponding equation are capable of determining the static and stability behavior of elastic framed structures made of tapered beam-columns with semi-rigid connections using a single segment per element. Three comprehensive examples are presented that show the accuracy and validity of the proposed method and the calculated results are compared with those obtained using ABAQUS.