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Elastic-plastic fracture analysis for small-scale yielding.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Elastic-plastic fracture analysis for small-scale yielding./
作者:	Kim, Hong-On.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1996,
面頁冊數:	122 p.
附註:	Source: Dissertations Abstracts International, Volume: 58-09, Section: B.
Contained By:	Dissertations Abstracts International58-09B.
標題:	Aerospace materials. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9713562
ISBN:	9780591212679

Elastic-plastic fracture analysis for small-scale yielding.
Kim, Hong-On.

Elastic-plastic fracture analysis for small-scale yielding. - Ann Arbor : ProQuest Dissertations & Theses, 1996 - 122 p.

Source: Dissertations Abstracts International, Volume: 58-09, Section: B.

Thesis (Ph.D.)--Purdue University, 1996.

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

The objective of the present study was to develop a criterion to characterize the influence of plastic deformation around the crack tip. The first part of this dissertation explored the plastic crack tip fields estimated by linear elastic fracture mechanics, then they were compared to the results from numerical elastic-plastic analysis in order to establish a border-line that the plastic deformation can be included in the concept of linear elastic fracture mechanics. The elastic-plastic energy release rate was proposed as the sum of separation work and plastic dissipation which can be computed through numerical simulation of crack growth. Based on intensive investigations, a plastic zone ratio $r\\sb{p}/a\\ \\approx$ 0.003 was chosen as the characterizing parameter for small scale yielding at which linear elastic fracture mechanics satisfactorily replaces elastic-plastic analysis. The elastic-plastic energy release rate calculated from two different finite element meshes and different nodal release techniques revealed no discrepancies; therefore, it could be regarded as being independent on a computational model, proving the validity of the modified energy balance concept. The feasibility of the elastic-plastic energy release rate in predicting mixed mode fracture behavior was verified through comparisons with existing fracture criteria and available experimental results. The direction of crack initiation was projected in the path of least plastic dissipation, and the combined load ratios were determined by the constant energy release rate, which resulted in different curves according to material properties.

ISBN: 9780591212679Subjects--Topical Terms:

3433227
Aerospace materials.
Subjects--Index Terms:

crack tip

Elastic-plastic fracture analysis for small-scale yielding.
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100 1 $a Kim, Hong-On. $3 3687143
245 1 0 $a Elastic-plastic fracture analysis for small-scale yielding.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1996
300 $a 122 p.
500 $a Source: Dissertations Abstracts International, Volume: 58-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Sun, Chih-Teh.
502 $a Thesis (Ph.D.)--Purdue University, 1996.
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 The objective of the present study was to develop a criterion to characterize the influence of plastic deformation around the crack tip. The first part of this dissertation explored the plastic crack tip fields estimated by linear elastic fracture mechanics, then they were compared to the results from numerical elastic-plastic analysis in order to establish a border-line that the plastic deformation can be included in the concept of linear elastic fracture mechanics. The elastic-plastic energy release rate was proposed as the sum of separation work and plastic dissipation which can be computed through numerical simulation of crack growth. Based on intensive investigations, a plastic zone ratio $r\\sb{p}/a\\ \\approx$ 0.003 was chosen as the characterizing parameter for small scale yielding at which linear elastic fracture mechanics satisfactorily replaces elastic-plastic analysis. The elastic-plastic energy release rate calculated from two different finite element meshes and different nodal release techniques revealed no discrepancies; therefore, it could be regarded as being independent on a computational model, proving the validity of the modified energy balance concept. The feasibility of the elastic-plastic energy release rate in predicting mixed mode fracture behavior was verified through comparisons with existing fracture criteria and available experimental results. The direction of crack initiation was projected in the path of least plastic dissipation, and the combined load ratios were determined by the constant energy release rate, which resulted in different curves according to material properties.
590 $a School code: 0183.
650 4 $a Aerospace materials. $3 3433227
650 4 $a Aerospace engineering. $3 1002622
653 $a crack tip
690 $a 0538
710 2 $a Purdue University. $3 1017663
773 0 $t Dissertations Abstracts International $g 58-09B.
790 $a 0183
791 $a Ph.D.
792 $a 1996
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9713562