Size effects in the torsion of microscale copper wires: Experiment and analysis

作者：Liu Dabiao; He Yuming^*; Tang Xutao; Ding Huaming; Hu Peng; Cao Peng

来源：Scripta Materialia, 2012, 66(6): 406-409.

DOI：10.1016/j.scriptamat.2011.12.003

• Torsion test
• Tension test
• Strain gradient plasticity
• Size effect

The size dependence in the torsional response of microsized polycrystalline copper wires is investigated experimentally using a novel automated torsion balance. Comparing to the corresponding tensile data, we find significant size effects in both the plastic flow stress and initial yielding in torsion, while only slight size effects present in tension. Our micro-torsion tests have high resolution in the low strain region. The experimental observations are explained in terms of a strain gradient plasticity theory with one material length variable.

• 出版日期2012-3
• 单位华中科技大学