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A dislocation-based multiscale model...

Taheri-Nassaj, Nasrin.

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A dislocation-based multiscale modeling of plasticity and controlling mechanisms.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A dislocation-based multiscale modeling of plasticity and controlling mechanisms./
作者:	Taheri-Nassaj, Nasrin.
面頁冊數:	163 p.
附註:	Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
Contained By:	Dissertation Abstracts International77-11B(E).
標題:	Mechanical engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10139592
ISBN:	9781339950778

A dislocation-based multiscale modeling of plasticity and controlling mechanisms.
Taheri-Nassaj, Nasrin.

A dislocation-based multiscale modeling of plasticity and controlling mechanisms. - 163 p.

Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.

Thesis (Ph.D.)--Washington State University, 2016.

The objective of this research is to investigate the plastic deformation and its controlling mechanisms in order to model and predict the material microstructure either dislocation pileups as a feature of plasticity or spatio-temporal dislocations pattern as another feature of plastic deformation using a hierarchical multiscale modeling approach from discrete dislocation dynamic to continuum dislocation dynamics and continuum mechanics.

ISBN: 9781339950778Subjects--Topical Terms:

649730
Mechanical engineering.

A dislocation-based multiscale modeling of plasticity and controlling mechanisms.
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245 1 2 $a A dislocation-based multiscale modeling of plasticity and controlling mechanisms.
300 $a 163 p.
500 $a Source: Dissertation Abstracts International, Volume: 77-11(E), Section: B.
500 $a Adviser: Hussein M. Zbib.
502 $a Thesis (Ph.D.)--Washington State University, 2016.
520 $a The objective of this research is to investigate the plastic deformation and its controlling mechanisms in order to model and predict the material microstructure either dislocation pileups as a feature of plasticity or spatio-temporal dislocations pattern as another feature of plastic deformation using a hierarchical multiscale modeling approach from discrete dislocation dynamic to continuum dislocation dynamics and continuum mechanics.
520 $a Investigation of size-dependent phenomenon in single crystals as well as polycrystals is the other objective of this research. We studied this size effect at small scales using the dislocation pileups within a stress-gradient plasticity theory and also using a continuum dislocation dynamic model coupled with a viscoplastic self-consistent (VPSC) model by introducing strain-gradient plasticity and stress-gradient plasticity models, also a combined model into viscoplasticity theory.
520 $a In strain-gradient plasticity, the length scale controlling size effect has been attributed to so-called geometrically necessary dislocations. This size dependency in plasticity can also be attributed to dislocation pileups in source-obstacle configurations. This has led to the development of stress-gradient plasticity models in the presence of stress gradients. In this work, we re-examine this pileup problem by investigating the double pileup of dislocations emitted from two sources in an inhomogeneous state of stress using both discrete dislocation dynamics and a continuum method which resulted in a dislocation-based stress-gradient plasticity model, leading to an explicit expression for flow stress. Our findings show that this expression depends on obstacle spacing, as in the Hall--Petch effect, as well as higher-order stress gradients.
520 $a In addition, we developed a physically-based mesoscale model for dislocation dynamics systems to predict the deformation and spontaneous formation of spatio-temporal dislocation patterns over microscopic space and time. This mesoscale model includes a set of nonlinear partial differential equations of reaction-diffusion type. Here we consider the equations within a one-dimensional framework and analyze the stability of steady-state solutions for these equations to elucidate the associated patterns with their intrinsic length scale. The numerical solution to the model in one-dimension as well as two-dimension yields the spatial distribution of dislocation patterns over time.
590 $a School code: 0251.
650 4 $a Mechanical engineering. $3 649730
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773 0 $t Dissertation Abstracts International $g 77-11B(E).
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791 $a Ph.D.
792 $a 2016
793 $a English
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