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Modeling of sheet metal fracture via...

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Modeling of sheet metal fracture via cohesive zone model and application to spot welds.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Modeling of sheet metal fracture via cohesive zone model and application to spot welds./
Author:	Wu, Joseph Z.
Description:	107 p.
Notes:	Adviser: Karl Grosh.
Contained By:	Dissertation Abstracts International69-03B.
Subject:	Applied Mechanics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3305108
ISBN:	9780549512387

Modeling of sheet metal fracture via cohesive zone model and application to spot welds.
Wu, Joseph Z.

Modeling of sheet metal fracture via cohesive zone model and application to spot welds. - 107 p.

Adviser: Karl Grosh.

Thesis (Ph.D.)--University of Michigan, 2008.

Even though the cohesive zone model (CZM) has been widely used to analyze ductile fracture, it is not yet clearly understood how to calibrate the cohesive parameters including the specific work of separation (the work of separation per unit crack area) and the peak stress. A systematic approach is presented to first determine the cohesive values for sheet metal and then apply the calibrated model to various structure problems including the failure of spot welds. Al5754-0 was chosen for this study since it is not sensitive to heat treatment so the effect of heat-affected-zone (HAZ) can be ignored. The CZM has been applied to successfully model both mode-I and mode-III fracture for various geometries including Kahn specimens, single-notch specimens, and deep double-notch specimens for mode-I and trouser specimens for mode-III. The mode-I fracture of coach-peel spot-weld nugget and the mixed-mode fracture of nugget pull-out have also been well simulated by the CZM. Using the mode-I average specific work of separation of 13 kJ/m2 identified in a previous work and the mode-III specific work of separation of 38 kJ/m 2 found in this thesis, the cohesive peak stress has been determined to range from 285 MPa to 600 MPa for mode-I and from 165 MPa to 280 MPa for mode-III, depending on the degree of plastic deformation. The uncertainty of these cohesive values has also been examined. It is concluded that, if the specific work of separation is a material constant, the peak stress changes with the degree of plastic deformation and is therefore geometry-dependent.

ISBN: 9780549512387Subjects--Topical Terms:

1018410
Applied Mechanics.

Modeling of sheet metal fracture via cohesive zone model and application to spot welds.
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008 100709s2008 ||||||||||||||||| ||eng d
020 $a 9780549512387
035 $a (UMI)AAI3305108
035 $a AAI3305108
040 $a UMI $c UMI
100 1 $a Wu, Joseph Z. $3 1023512
245 1 0 $a Modeling of sheet metal fracture via cohesive zone model and application to spot welds.
300 $a 107 p.
500 $a Adviser: Karl Grosh.
500 $a Source: Dissertation Abstracts International, Volume: 69-03, Section: B, page: 1923.
502 $a Thesis (Ph.D.)--University of Michigan, 2008.
520 $a Even though the cohesive zone model (CZM) has been widely used to analyze ductile fracture, it is not yet clearly understood how to calibrate the cohesive parameters including the specific work of separation (the work of separation per unit crack area) and the peak stress. A systematic approach is presented to first determine the cohesive values for sheet metal and then apply the calibrated model to various structure problems including the failure of spot welds. Al5754-0 was chosen for this study since it is not sensitive to heat treatment so the effect of heat-affected-zone (HAZ) can be ignored. The CZM has been applied to successfully model both mode-I and mode-III fracture for various geometries including Kahn specimens, single-notch specimens, and deep double-notch specimens for mode-I and trouser specimens for mode-III. The mode-I fracture of coach-peel spot-weld nugget and the mixed-mode fracture of nugget pull-out have also been well simulated by the CZM. Using the mode-I average specific work of separation of 13 kJ/m2 identified in a previous work and the mode-III specific work of separation of 38 kJ/m 2 found in this thesis, the cohesive peak stress has been determined to range from 285 MPa to 600 MPa for mode-I and from 165 MPa to 280 MPa for mode-III, depending on the degree of plastic deformation. The uncertainty of these cohesive values has also been examined. It is concluded that, if the specific work of separation is a material constant, the peak stress changes with the degree of plastic deformation and is therefore geometry-dependent.
590 $a School code: 0127.
650 4 $a Applied Mechanics. $3 1018410
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0346
690 $a 0548
690 $a 0794
710 2 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 69-03B.
790 $a 0127
790 1 0 $a Grosh, Karl, $e advisor
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3305108