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Substructure based modeling of nicke...

Zhou, Dong.

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Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes./
Author:	Zhou, Dong.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2004,
Description:	218 p.
Notes:	Source: Dissertations Abstracts International, Volume: 66-12, Section: B.
Contained By:	Dissertations Abstracts International66-12B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3158634
ISBN:	9780496919314

Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes.
Zhou, Dong.

Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes. - Ann Arbor : ProQuest Dissertations & Theses, 2004 - 218 p.

Source: Dissertations Abstracts International, Volume: 66-12, Section: B.

Thesis (Ph.D.)--Clarkson University, 2004.

This item must not be sold to any third party vendors.

In this dissertation a meso-scale, substructure-based, composite single crystal model is fully developed from the simple uniaxial model to the 3-D finite element method (FEM) model with explicit substructures and further with substructure evolution parameters, to simulate the completely reversed, strain controlled, low plastic strain amplitude cyclic deformation of nickel single crystals. Rate-dependent viscoplasticity and Armstrong-Frederick type kinematic hardening rules are applied to substructures on slip systems in the model to describe the kinematic hardening behavior of crystals. Three explicit substructure components are assumed in the composite single crystal model, namely "loop patches" and "channels" which are aligned in parallel in a "vein matrix," and persistent slip bands (PSBs) connected in series with the vein matrix. A magnetic domain rotation model is presented to describe the reverse magnetostriction of single crystal nickel. Kinematic hardening parameters are obtained by fitting responses to experimental data in the uniaxial model, and the validity of uniaxial assumption is verified in the 3-D FEM model with explicit substructures. With information gathered from experiments, all control parameters in the model including hardening parameters, volume fraction of loop patches and PSBs, and variation of Young's modulus etc. are correlated to cumulative plastic strain and/or plastic strain amplitude; and the whole cyclic deformation history of single crystal nickel at low plastic strain amplitudes is simulated in the uniaxial model. Then these parameters are implanted in the 3-D FEM model to simulate the formation of PSB bands. A resolved shear stress criterion is set to trigger the formation of PSBs, and stress perturbation in the specimen is obtained by several elements assigned with PSB material properties a priori. Displacement increment, plastic strain amplitude control and overall stress-strain monitor and output are carried out in the user subroutine DISP and URDFIL of ABAQUS, respectively, while constitutive formulations of the FEM model are coded and implemented in UMAT. The results of the simulations are compared to experiments. This model verified the validity of Winter's two-phase model and Taylor's uniform stress assumption, explored substructure evolution and "intrinsic" behavior in substructures and successfully simulated the process of PSB band formation and propagation.

ISBN: 9780496919314Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Nickel

Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes.
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008 220723s2004 ||||||||||||||||| ||eng d
020 $a 9780496919314
035 $a (MiAaPQ)AAI3158634
035 $a AAI3158634
040 $a MiAaPQ $c MiAaPQ
100 1 $a Zhou, Dong. $3 1910003
245 1 0 $a Substructure based modeling of nickel single crystals cycled at low plastic strain amplitudes.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2004
300 $a 218 p.
500 $a Source: Dissertations Abstracts International, Volume: 66-12, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Moosbrugger, John C.;Morrison, David J.
502 $a Thesis (Ph.D.)--Clarkson University, 2004.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a In this dissertation a meso-scale, substructure-based, composite single crystal model is fully developed from the simple uniaxial model to the 3-D finite element method (FEM) model with explicit substructures and further with substructure evolution parameters, to simulate the completely reversed, strain controlled, low plastic strain amplitude cyclic deformation of nickel single crystals. Rate-dependent viscoplasticity and Armstrong-Frederick type kinematic hardening rules are applied to substructures on slip systems in the model to describe the kinematic hardening behavior of crystals. Three explicit substructure components are assumed in the composite single crystal model, namely "loop patches" and "channels" which are aligned in parallel in a "vein matrix," and persistent slip bands (PSBs) connected in series with the vein matrix. A magnetic domain rotation model is presented to describe the reverse magnetostriction of single crystal nickel. Kinematic hardening parameters are obtained by fitting responses to experimental data in the uniaxial model, and the validity of uniaxial assumption is verified in the 3-D FEM model with explicit substructures. With information gathered from experiments, all control parameters in the model including hardening parameters, volume fraction of loop patches and PSBs, and variation of Young's modulus etc. are correlated to cumulative plastic strain and/or plastic strain amplitude; and the whole cyclic deformation history of single crystal nickel at low plastic strain amplitudes is simulated in the uniaxial model. Then these parameters are implanted in the 3-D FEM model to simulate the formation of PSB bands. A resolved shear stress criterion is set to trigger the formation of PSBs, and stress perturbation in the specimen is obtained by several elements assigned with PSB material properties a priori. Displacement increment, plastic strain amplitude control and overall stress-strain monitor and output are carried out in the user subroutine DISP and URDFIL of ABAQUS, respectively, while constitutive formulations of the FEM model are coded and implemented in UMAT. The results of the simulations are compared to experiments. This model verified the validity of Winter's two-phase model and Taylor's uniform stress assumption, explored substructure evolution and "intrinsic" behavior in substructures and successfully simulated the process of PSB band formation and propagation.
590 $a School code: 0049.
650 4 $a Mechanical engineering. $3 649730
650 4 $a Materials science. $3 543314
650 4 $a Mechanics. $3 525881
653 $a Nickel
653 $a Plastic strain
653 $a Single crystals
690 $a 0548
690 $a 0794
690 $a 0346
710 2 $a Clarkson University. $3 1020943
773 0 $t Dissertations Abstracts International $g 66-12B.
790 $a 0049
791 $a Ph.D.
792 $a 2004
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3158634