Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion

The elastic-plastic fracture behavior of a Zener-Stroh crack nucleated by a wedge disclination dipole interacting with a nearby circular inclusion is investigated. It is known that a disclination is a strong source of internal stresses and energy, one possible way for the relaxation of the stresses...

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Main Authors: Fan, M., Zhang, Yan Mei, Xiao, Zhong Min
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2016
Subjects:
Online Access:https://hdl.handle.net/10356/80579
http://hdl.handle.net/10220/40606
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-805792020-03-07T13:19:20Z Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion Fan, M. Zhang, Yan Mei Xiao, Zhong Min School of Mechanical and Aerospace Engineering Zener-Stroh crack Wedge disclination disclination–inclusion interaction plastic zone correction small scale yielding The elastic-plastic fracture behavior of a Zener-Stroh crack nucleated by a wedge disclination dipole interacting with a nearby circular inclusion is investigated. It is known that a disclination is a strong source of internal stresses and energy, one possible way for the relaxation of the stresses can be in the form of an initiated crack. In the current work, the nucleated Zener-Stroh crack is simulated by a series of edge dislocations with distributed dislocation method. The influence of the disclination is accounted through crack surface traction free condition. To improve the analysis accuracy, the Irwin plastic zone correction is employed to evaluate the elastic-plastic fracture behavior at the sharp crack tip. Von Mises yielding criterion is applied in the plastic zone area to judge the yielding occurrence. Numerical results are given to study the influence of the disclination strength, disclination dipole arm as well as material properties on the stress intensity factor (SIF), plastic zone size (PZS), and crack tip opening displacement (CTOD). It is found that the property of the wedge disclination dipole has great effect on the stress field and the elastic-plastic fracture behavior of the Zener-Stroh crack. Either disclination strength or dipole arm increases, the SIF, PZS, and CTOD will increase significantly. For the same disclination, if the nucleated Zener-Stroh crack has a longer crack length, the SIF, PZS, and CTOD could be smaller. For a Zener-Stroh crack nucleated between the inclusion and the disclination dipole, the interaction between the disclination and inclusion greatly influences the elastic-plastic fracture behavior. However, this influence highly depends on material combinations of the two phases. 2016-06-02T07:41:49Z 2019-12-06T13:52:34Z 2016-06-02T07:41:49Z 2019-12-06T13:52:34Z 2016 2016 Journal Article Fan, M., Zhang, Y. M., & Xiao, Z. M. (2016). Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion. International Journal of Damage Mechanics, in press. 1056-7895 https://hdl.handle.net/10356/80579 http://hdl.handle.net/10220/40606 10.1177/1056789516636946 190679 en International Journal of Damage Mechanics © 2016 The Authors (published by SAGE Publications).
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Zener-Stroh crack
Wedge disclination
disclination–inclusion interaction
plastic zone correction
small scale yielding
spellingShingle Zener-Stroh crack
Wedge disclination
disclination–inclusion interaction
plastic zone correction
small scale yielding
Fan, M.
Zhang, Yan Mei
Xiao, Zhong Min
Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
description The elastic-plastic fracture behavior of a Zener-Stroh crack nucleated by a wedge disclination dipole interacting with a nearby circular inclusion is investigated. It is known that a disclination is a strong source of internal stresses and energy, one possible way for the relaxation of the stresses can be in the form of an initiated crack. In the current work, the nucleated Zener-Stroh crack is simulated by a series of edge dislocations with distributed dislocation method. The influence of the disclination is accounted through crack surface traction free condition. To improve the analysis accuracy, the Irwin plastic zone correction is employed to evaluate the elastic-plastic fracture behavior at the sharp crack tip. Von Mises yielding criterion is applied in the plastic zone area to judge the yielding occurrence. Numerical results are given to study the influence of the disclination strength, disclination dipole arm as well as material properties on the stress intensity factor (SIF), plastic zone size (PZS), and crack tip opening displacement (CTOD). It is found that the property of the wedge disclination dipole has great effect on the stress field and the elastic-plastic fracture behavior of the Zener-Stroh crack. Either disclination strength or dipole arm increases, the SIF, PZS, and CTOD will increase significantly. For the same disclination, if the nucleated Zener-Stroh crack has a longer crack length, the SIF, PZS, and CTOD could be smaller. For a Zener-Stroh crack nucleated between the inclusion and the disclination dipole, the interaction between the disclination and inclusion greatly influences the elastic-plastic fracture behavior. However, this influence highly depends on material combinations of the two phases.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Fan, M.
Zhang, Yan Mei
Xiao, Zhong Min
format Article
author Fan, M.
Zhang, Yan Mei
Xiao, Zhong Min
author_sort Fan, M.
title Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
title_short Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
title_full Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
title_fullStr Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
title_full_unstemmed Small scale yielding analysis for a disclination-nucleated Zener-Stroh crack interacting with a circular inclusion
title_sort small scale yielding analysis for a disclination-nucleated zener-stroh crack interacting with a circular inclusion
publishDate 2016
url https://hdl.handle.net/10356/80579
http://hdl.handle.net/10220/40606
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