Analyses of Dislocation Effects on Plastic Deformation
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REVIEW
Analyses of Dislocation Effects on Plastic Deformation Sedigheh Mohamadnejad1 · Ali Basti1 · Reza Ansari1 Received: 24 September 2019 / Revised: 12 April 2020 / Accepted: 25 June 2020 © Korean Multi-Scale Mechanics (KMSM) 2020
Abstract This paper reviews the dislocation based models that have been used until now to consider dislocation effects on the plastic deformation in the crystalline material. We separate two general strategies: discrete dislocation dynamics models that consider individual dislocations and continuum dislocation dynamics models that consider dislocation density as a state variable to analyze the plastic deformation. Since these methods are very widespread due to suggested new approaches and computational advances they need to be reviewed. The objective of this review is to introduce these methods and comparing existing results in two categories to know which method can be used to reach more accurate results for considering dislocation in crystalline metals. Seventeen papers and thesis were chosen that predicted the stress–strain curve of different crystalline material by emphasizing dislocation effect on their results. Advantages and lacks of both methods are mentioned and it is discussed which method is suitable for stress–strain prediction. It is observed that continuum dislocation dynamics methods can predict the stress–strain curves more efficiently than discreet dislocation dynamics. Keywords Dislocation density · Plastic deformation · Crystalline materials · Dislocation evolution
Introduction Recent developments in material microstructure have heightened the need for considering the dislocations role in figuring out and simulating plastically deforming materials. Notwithstanding all the attempts and progress which have been made, studies are not yet been completed. The individual behavior of dislocations is well known, but their collective behavior still needs further study. Even though the crossslip is well-known experimentally, it is still considered as a problem in the field of discrete dislocation dynamics (DDD) [1]. In addition, the motion of dislocations, and forecasting the interactions and collective motion of dislocations is a key task in understanding and modeling plastically deforming materials. This task despite all the efforts and advances of the last few decades, has not yet been fully accomplished [2]. * Ali Basti [email protected] Sedigheh Mohamadnejad [email protected] Reza Ansari [email protected] 1
Department of Mechanical Engineering, University of Guilan, Rasht, Iran
There are two methods to measure dislocation. There are some models uses a parameter (or couple of parameters) in order to represent the real dislocations. In the primary method, the entire length of the dislocation line in a unit volume is measured and divided through the volume. In the second one, the number of dislocation crossing the unit area within the pattern is counted [3]. In the theoretical study of plastic glide in crystalline solids, discovering an actual d
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