Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models
Deformation of metals has attracted great interest for a long time. However, the constitutive models for viscoplastic deformation at high strain rates are still under intensive development, and more physical mechanisms are expected to be involved. In this work, we employ the newly-proposed methodolo...
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MDPI AG
2021-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/16/4667 |
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| author | Wen Lai Huang Lin Zhang Kaiguo Chen Guo Lu |
| author_facet | Wen Lai Huang Lin Zhang Kaiguo Chen Guo Lu |
| author_sort | Wen Lai Huang |
| collection | DOAJ |
| description | Deformation of metals has attracted great interest for a long time. However, the constitutive models for viscoplastic deformation at high strain rates are still under intensive development, and more physical mechanisms are expected to be involved. In this work, we employ the newly-proposed methodology of mesoscience to identify the mechanisms governing the mesoscale complexity of collective dislocations, and then apply them to improving constitutive models. Through analyzing the competing effects of various processes on the mesoscale behavior, we have recognized two competing mechanisms governing the mesoscale complex behavior of dislocations, i.e., maximization of the rate of plastic work, and minimization of the elastic energy. Relevant understandings have also been discussed. Extremal expressions have been proposed for these two mesoscale mechanisms, respectively, and a stability condition for mesoscale structures has been established through a recently-proposed mathematical technique, considering the compromise between the two competing mechanisms. Such a stability condition, as an additional constraint, has been employed subsequently to close a two-phase model mimicking the practical dislocation cells, and thus to take into account the heterogeneous distributions of dislocations. This scheme has been exemplified in three increasingly complicated constitutive models, and improves the agreements of their results with experimental ones. |
| first_indexed | 2024-03-10T08:38:14Z |
| format | Article |
| id | doaj.art-8d7e834836aa490d8a35c1962071d629 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T08:38:14Z |
| publishDate | 2021-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-8d7e834836aa490d8a35c1962071d6292023-11-22T08:31:01ZengMDPI AGMaterials1996-19442021-08-011416466710.3390/ma14164667Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive ModelsWen Lai Huang0Lin Zhang1Kaiguo Chen2Guo Lu3State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaState Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, ChinaNational Key Laboratory of Shockwave Physics and Detonation Physics, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, ChinaLaboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, ChinaDeformation of metals has attracted great interest for a long time. However, the constitutive models for viscoplastic deformation at high strain rates are still under intensive development, and more physical mechanisms are expected to be involved. In this work, we employ the newly-proposed methodology of mesoscience to identify the mechanisms governing the mesoscale complexity of collective dislocations, and then apply them to improving constitutive models. Through analyzing the competing effects of various processes on the mesoscale behavior, we have recognized two competing mechanisms governing the mesoscale complex behavior of dislocations, i.e., maximization of the rate of plastic work, and minimization of the elastic energy. Relevant understandings have also been discussed. Extremal expressions have been proposed for these two mesoscale mechanisms, respectively, and a stability condition for mesoscale structures has been established through a recently-proposed mathematical technique, considering the compromise between the two competing mechanisms. Such a stability condition, as an additional constraint, has been employed subsequently to close a two-phase model mimicking the practical dislocation cells, and thus to take into account the heterogeneous distributions of dislocations. This scheme has been exemplified in three increasingly complicated constitutive models, and improves the agreements of their results with experimental ones.https://www.mdpi.com/1996-1944/14/16/4667dislocationshock waveviscoplastic deformationconstitutive modelheterogeneitymesoscale |
| spellingShingle | Wen Lai Huang Lin Zhang Kaiguo Chen Guo Lu Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models Materials dislocation shock wave viscoplastic deformation constitutive model heterogeneity mesoscale |
| title | Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models |
| title_full | Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models |
| title_fullStr | Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models |
| title_full_unstemmed | Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models |
| title_short | Mesoscale Mechanisms in Viscoplastic Deformation of Metals and Their Applications to Constitutive Models |
| title_sort | mesoscale mechanisms in viscoplastic deformation of metals and their applications to constitutive models |
| topic | dislocation shock wave viscoplastic deformation constitutive model heterogeneity mesoscale |
| url | https://www.mdpi.com/1996-1944/14/16/4667 |
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