The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform

Giacomo Po - One of the best experts on this subject based on the ideXlab platform.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    Journal of Materials Science Research, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation processes, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dislocations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density tensor fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    arXiv: Materials Science, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation pro- cesses, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dis- locations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

Reese E Jones - One of the best experts on this subject based on the ideXlab platform.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    Journal of Materials Science Research, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation processes, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dislocations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density tensor fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    arXiv: Materials Science, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation pro- cesses, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dis- locations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

Jonathan A Zimmerman - One of the best experts on this subject based on the ideXlab platform.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    Journal of Materials Science Research, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation processes, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dislocations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density tensor fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

  • comparison of dislocation density tensor fields derived from discrete dislocation dynamics and crystal plasticity simulations of torsion
    arXiv: Materials Science, 2016
    Co-Authors: Reese E Jones, Jonathan A Zimmerman, Giacomo Po
    Abstract:

    The importance of accurate simulation of the plastic deformation of ductile metals to the design of structures and components is well-known. Many techniques exist that address the length scales relevant to deformation pro- cesses, including dislocation dynamics (DD), which models the interaction and evolution of discrete dislocation line segments, and crystal plasticity (CP), which incorporates the crystalline nature and restricted motion of dis- locations into a higher scale continuous field framework. While these two methods are conceptually related, there have been only nominal efforts focused on the system-level material response that use DD-generated information to enhance the fidelity of plasticity models. To ascertain to what degree the predictions of CP are consistent with those of DD, we compare their global and microstructural response in a number of deformation modes. After using nominally Homogeneous Compression and shear deformation dislocation dynamics simulations to calibrate crystal plasticity flow rule parameters, we compare not only the system-level stress-strain response of prismatic wires in torsion but also the resulting geometrically necessary dislocation density fields. To establish a connection between explicit description of dislocations and the continuum assumed with crystal plasticity simulations, we ascertain the minimum length-scale at which meaningful dislocation density fields appear. Our results show that, for the case of torsion, the two material models can produce comparable spatial dislocation density distributions.

Alain Goriely - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear correction to the euler buckling formula for compressed cylinders with guided guided end conditions
    Journal of Elasticity, 2011
    Co-Authors: R De Pascalis, Michel Destrade, Alain Goriely
    Abstract:

    Euler’s celebrated buckling formula gives the critical load N for the buckling of a slender cylindrical column with radius B and length L as $$N/(\pi^3B^2)=(E/4)(B/L)^2,$$ where E is Young’s modulus. Its derivation relies on the assumptions that linear elasticity applies to this problem, and that the slenderness (B/L) is an infinitesimal quantity. Here we ask the following question: What is the first non-linear correction in the right hand-side of this equation when terms up to (B/L)4 are kept? To answer this question, we specialize the exact solution of incremental non-linear elasticity for the Homogeneous Compression of a thick compressible cylinder with lubricated ends to the theory of third-order elasticity. In particular, we highlight the way second- and third-order constants—including Poisson’s ratio—all appear in the coefficient of (B/L)4.

  • nonlinear correction to the euler buckling formula forcompressible cylinders
    2010
    Co-Authors: R De Pascalis, Michel Destrade, Alain Goriely
    Abstract:

    Euler’s celebrated buckling formula gives the critical load N for the buckling of a slender cylindrical column with radius B and length L as N/(π 3B2)=(E/4)(B/L)2, where E is Young’s modulus. Its derivation relies on the assumptions that linear elasticity applies to this problem, and that the slenderness (B/L) is an infinitesimal quantity. Here we ask the following question: What is the first nonlinear correction in the right hand-side of this equation when terms up to (B/L)4 are kept? To answer this question, we specialize the exact solution of non-linear elasticity for the Homogeneous Compression of a thick cylinder with lubricated ends to the theory of third-order elasticity. In particular, we highlight the way second- and third-order constants —including Poisson’s ratio— all appear in the coefficient of (B/L)4.

R De Pascalis - One of the best experts on this subject based on the ideXlab platform.

  • nonlinear correction to the euler buckling formula for compressed cylinders with guided guided end conditions
    Journal of Elasticity, 2011
    Co-Authors: R De Pascalis, Michel Destrade, Alain Goriely
    Abstract:

    Euler’s celebrated buckling formula gives the critical load N for the buckling of a slender cylindrical column with radius B and length L as $$N/(\pi^3B^2)=(E/4)(B/L)^2,$$ where E is Young’s modulus. Its derivation relies on the assumptions that linear elasticity applies to this problem, and that the slenderness (B/L) is an infinitesimal quantity. Here we ask the following question: What is the first non-linear correction in the right hand-side of this equation when terms up to (B/L)4 are kept? To answer this question, we specialize the exact solution of incremental non-linear elasticity for the Homogeneous Compression of a thick compressible cylinder with lubricated ends to the theory of third-order elasticity. In particular, we highlight the way second- and third-order constants—including Poisson’s ratio—all appear in the coefficient of (B/L)4.

  • nonlinear correction to the euler buckling formula forcompressible cylinders
    2010
    Co-Authors: R De Pascalis, Michel Destrade, Alain Goriely
    Abstract:

    Euler’s celebrated buckling formula gives the critical load N for the buckling of a slender cylindrical column with radius B and length L as N/(π 3B2)=(E/4)(B/L)2, where E is Young’s modulus. Its derivation relies on the assumptions that linear elasticity applies to this problem, and that the slenderness (B/L) is an infinitesimal quantity. Here we ask the following question: What is the first nonlinear correction in the right hand-side of this equation when terms up to (B/L)4 are kept? To answer this question, we specialize the exact solution of non-linear elasticity for the Homogeneous Compression of a thick cylinder with lubricated ends to the theory of third-order elasticity. In particular, we highlight the way second- and third-order constants —including Poisson’s ratio— all appear in the coefficient of (B/L)4.