Development of mean-field continuum dislocation kinematics with junction reactions using de Rham currents and graph theory
Development of mean-field continuum dislocation kinematics with junction reactions using de Rham currents and graph theory
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使用德拉姆电流和图论开发具有结反应的平均场连续位错运动学
DOI:
10.1016/j.jmps.2021.104685
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发表时间:
2022
影响因子:
5.3
通讯作者:
El-Azab, Anter
中科院分区:
文献类型:
--
作者:
Starkey, Kyle;Hochrainer, Thomas;El-Azab, Anter
An accurate description of the evolution of dislocation networks is an essential part of discrete and continuum dislocation dynamics models. These networks evolve by motion of the dislocation lines and by forming junctions between these lines via cross slip, annihilation and junction reactions. In this work, we introduce these dislocation reactions into continuum dislocation models using the theory of de Rham currents. We introduce dislocations on each slip system as potentially open lines whose boundaries are associated with junction points and, therefore, still create a network of collectively closed lines that satisfy the classical relations α= curl β p and div α= 0 for the dislocation density tensor α and the plastic distortion β p. To ensure this, we leverage Frank’s second rule at the junction nodes and the concept of virtual dislocation segments. We introduce the junction point density as a new state variable that represents the distribution of junction points within the crystal containing the dislocation network. Adding this information requires knowledge of the global structure of the dislocation network, which we obtain from its representation as a graph. We derive transport relations for the dislocation line density on each slip system in the crystal, which now includes a term that corresponds to the motion of junction points. We also derive the transport relations for junction points, which include source terms that reflect the topology changes of the dislocation network due to junction formation.
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影响因子:
--
作者:
S. Akhondzadeh;N. Bertin;R. Sills;W. Cai
通讯作者:
W. Cai
DOI:
10.1088/1361-651x/ab97ef
发表时间:
2020
影响因子:
1.8
作者:
Markus Sudmanns;J. Bach;D. Weygand;K. Schulz
通讯作者:
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DOI:
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发表时间:
1999
期刊:
Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences
影响因子:
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作者:
P. Cermelli
通讯作者:
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DOI:
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发表时间:
2003
期刊:
影响因子:
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作者:
L. Kubin;R. Madec;B. Devincre
通讯作者:
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DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
V. Capasso
通讯作者:
V. Capasso