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2 Journal of Theoretical and Applied Mechanics

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Influence of pre-tension on torsion of microscale Cu wires: a study via strain gradient theory

Ma Xinbing, Liu Jinxing

Journal of Theoretical and Applied Mechanics

2019

Vol. 57 nr 4

1055--1065

Nonproportional plastic deformations on the microscale are an emerging topic. A simplified theory of strain gradient elasto-plasticity is developed to study the evolution of yield strength in a copper wire sequentially experiencing tension and torsion. The pre-tension deformation and stress are inherited to the upcoming torsion process, resulting in a nonproportional loading condition. With consideration of the extra hardening effect due to strain gradient, pre-tension weakens the extra hardening effect of the strain gradient and the dependence on the wire radius. Cyclic torsion behavior is also investigated. Anomalous Bauschinger effect and plastic softening are found.

A two-dimensional finite element model of the grain boundary based on thermo-mechanical strain gradient plasticity

Song Y., Voyiadjis G. Z.

Journal of Theoretical and Applied Mechanics

2018

Vol. 56 nr 2

377--391

In this work, a two-dimensional finite element model for the grain boundary flow rule is developed based on the thermo-mechanical gradient-enhanced plasticity theory. The proposed model is temperature-dependent. A special attention is given to physical and micromechanical nature of dislocation interactions in combination with thermal activation on stored and dissipated energy. Thermodynamic conjugate microforces are decomposed into energetic and dissipative components. Correspondingly, two different grain boundary material length scales are present in the proposed model. Finally, numerical examples are solved in order to explore characteristics of the proposed grain boundary flow rule.