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ARTICLE
Influence of pre-tension on torsion of microscale Cu wires: a study via strain gradient theory
1
Jiangsu University, Faculty of Civil Engineering and Mechanics, Zhenjiang, Jiangsu Province
Submission date: 2019-01-14
Acceptance date: 2019-06-17
Online publication date: 2019-10-15
Publication date: 2019-10-15
Journal of Theoretical and Applied Mechanics 2019;57(4):1055-1065
KEYWORDS
ABSTRACT
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.
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