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Constitutive modeling of slip, twinn...

Li, Min.

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Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium./
作者:	Li, Min.
面頁冊數:	166 p.
附註:	Adviser: Robert H. Wagoner.
Contained By:	Dissertation Abstracts International66-11B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3197872
ISBN:	9780542422096

Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium.
Li, Min.

Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium. - 166 p.

Adviser: Robert H. Wagoner.

Thesis (Ph.D.)--The Ohio State University, 2006.

Magnesium has reasonable intrinsic cost and exceptional specific strength and stiffness, making it attractive for vehicle structural application. Its adoption in wrought form is limited by room-temperature formability issues related to complex plastic behavior caused by its HCP crystal structure and the presence of twinning. In order to potentially exploit these characteristics in designing a novel forming operation, an efficient material model suitable for finite element implementation would be helpful.

ISBN: 9780542422096Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium.
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100 1 $a Li, Min. $3 1033985
245 1 0 $a Constitutive modeling of slip, twinning, and untwinning in AZ31B magnesium.
300 $a 166 p.
500 $a Adviser: Robert H. Wagoner.
500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6234.
502 $a Thesis (Ph.D.)--The Ohio State University, 2006.
520 $a Magnesium has reasonable intrinsic cost and exceptional specific strength and stiffness, making it attractive for vehicle structural application. Its adoption in wrought form is limited by room-temperature formability issues related to complex plastic behavior caused by its HCP crystal structure and the presence of twinning. In order to potentially exploit these characteristics in designing a novel forming operation, an efficient material model suitable for finite element implementation would be helpful.
520 $a Such a model has been constructed based on three phenomenological deformation modes: S (slip), T (twinning) and U (untwinning), corresponding respectively to in-plane tension, initial in-plane compression and initial tension following compression. A von Mises yield surface with initial non-zero back stress was employed to account for plastic yielding asymmetry. The model was formulated with combined isotropic and nonlinear kinematic hardening. Texture was quantified using a weighted discrete probability density function of c-axis orientations. Starting from an assumed perfectly basal-textured sheet, in-plane compression causes reorientation of c-axes toward the compression direction by twinning, and subsequent tension returns them to a sheet normal direction by untwinning. The orientation of c-axes evolves with twinning/untwinning deformation using explicit rules incorporated in the model. The proposed model was implemented in ABAQUS/Standard through UMAT. Constitutive parameters were calibrated from in-plane tension/compression and reversal tests. Simple shear tests were simulated and compared with experiments with good agreement obtained. Tests under a complex loading path, such as orthogonal compressions, tension following orthogonal compression and tension following biaxial compression, were also simulated.
590 $a School code: 0168.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Metallurgy. $3 1023648
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710 2 0 $a The Ohio State University. $3 718944
773 0 $t Dissertation Abstracts International $g 66-11B.
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