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Simulation of Electrohydraulic Formi...

Hassannejadasl, Amir.

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Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models./
作者:	Hassannejadasl, Amir.
面頁冊數:	276 p.
附註:	Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
Contained By:	Dissertation Abstracts International76-03B(E).
標題:	Automotive engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645294
ISBN:	9781321341140

Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models.
Hassannejadasl, Amir.

Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models. - 276 p.

Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.

Thesis (Ph.D.)--University of Windsor (Canada), 2014.

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

Electrohydraulic forming (EHF) is a pulsed forming process in which two or more electrodes are positioned in a chamber filled with a liquid and a high-voltage discharge between the electrodes generates a high-pressure to form the sheet. Deformation history of a sheet material in EHF process shows substantial changes in the strain rate of the material during the forming process. In this research, the mechanical properties of DP600, TRIP780, and AA5182-O were obtained at different strain rates. Uniaxial tensile tests showed significant strain-rate sensitivity in all three material orientations (RD, DD, and TD) for DP600 and TRIP780. In contrast, AA5182-O exhibits almost near-zero strain-rate sensitivity. Several anisotropic yield functions were calibrated at various strain rates to evaluate the effect of strain rate on the flow surface shape. By comparing the quasistatic and updated flow surfaces of DP600 and TRIP780 predicted by Yld2000-2d, results show a relatively considerable effect of updating anisotropy coefficients for higher strain rates.

ISBN: 9781321341140Subjects--Topical Terms:

2181195
Automotive engineering.

Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models.
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100 1 $a Hassannejadasl, Amir. $3 3177226
245 1 0 $a Simulation of Electrohydraulic Forming Using Anisotropic, Rate-dependent Plasticity Models.
300 $a 276 p.
500 $a Source: Dissertation Abstracts International, Volume: 76-03(E), Section: B.
500 $a Adviser: Daniel E. Green.
502 $a Thesis (Ph.D.)--University of Windsor (Canada), 2014.
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 Electrohydraulic forming (EHF) is a pulsed forming process in which two or more electrodes are positioned in a chamber filled with a liquid and a high-voltage discharge between the electrodes generates a high-pressure to form the sheet. Deformation history of a sheet material in EHF process shows substantial changes in the strain rate of the material during the forming process. In this research, the mechanical properties of DP600, TRIP780, and AA5182-O were obtained at different strain rates. Uniaxial tensile tests showed significant strain-rate sensitivity in all three material orientations (RD, DD, and TD) for DP600 and TRIP780. In contrast, AA5182-O exhibits almost near-zero strain-rate sensitivity. Several anisotropic yield functions were calibrated at various strain rates to evaluate the effect of strain rate on the flow surface shape. By comparing the quasistatic and updated flow surfaces of DP600 and TRIP780 predicted by Yld2000-2d, results show a relatively considerable effect of updating anisotropy coefficients for higher strain rates.
520 $a Several rate-dependent anisotropic material models (plane stress and general) were developed, by combining updated anisotropic yield functions and a rate-dependent hardening model (KHL). The developed models were implemented as user-defined material subroutines (VUMATs) based on implicit stress integration algorithm for ABAQUS/Explicit code to simulate electrohydraulic free-forming (EHFF) and die-forming (EHDF) processes. EHF simulations were completed, using Eulerian elements and ignition-and-growth model. The EHFF process was simulated for four different geometries (representing four different strain paths). Also, the EHDF process was simulated using a conical die The EHFF simulation results for the DP600 biaxial specimen showed that von Mises predicts a maximum effective plastic strain around 11% greater than Yld2000-2d for the same amount of applied energy.
520 $a The EHDF simulation result for DP600 showed that with the same applied energy magnitude, von Mises overpredicts major, minor and through-thickness shear strains and consequently effective plastic strain (14% higher) compared to Yld2004-18p. Results showed that 82% of the effective plastic strain occurs under a proportional biaxial strain path before contacting the die. Also, results showed that von Mises overpredicts maximum absolute compressive through-thickness stress and shear strain compared to the values predicted by Yld2004-18p.
590 $a School code: 0115.
650 4 $a Automotive engineering. $3 2181195
650 4 $a Mechanical engineering. $3 649730
690 $a 0540
690 $a 0548
710 2 $a University of Windsor (Canada). $b Mechanical, Automotive and Materials Engineering. $3 3177227
773 0 $t Dissertation Abstracts International $g 76-03B(E).
790 $a 0115
791 $a Ph.D.
792 $a 2014
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3645294