Nanostrain sensitivity in a wire torsion experiment.

@article{Ali2020NanostrainSI,
  title={Nanostrain sensitivity in a wire torsion experiment.},
  author={W Ali and D Liu and J. Li and Anne Pery and Nilvia Herrada and David Mills and Robert Anthony Owen and P. Burton and Dong Dong and G. Gannaway and Andrew J. Bushby and D. J. Dunstan},
  journal={The Review of scientific instruments},
  year={2020},
  volume={91 1},
  pages={
          013901
        }
}
The feasibility of a thin-wire torsion stress-strain experiment with nanostrain sensitivity is demonstrated. A gauge length of 50 m was made possible by using The Monument, London, thereby restoring it to its original purpose as a scientific instrument. A wire of 150 μm diameter was studied using the load-unload method, and data were recorded in the elastic regime and through the elastic-plastic transition. Analysis of this preliminary experiment suggested some necessary improvements to the… 
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References

SHOWING 1-10 OF 27 REFERENCES
Plasticity and thermal recovery of thin copper wires in torsion
Experiments in small-scale plasticity usually focus on small-sized samples. However, studying thin wires with lengths up to metres in torsion has the advantage of giving extremely high strain
Elastic limit and strain hardening of thin wires in torsion.
TLDR
A theory for the size effect in the strength of wires under torsion is reported and compared with data from thin copper wires, implying that the physical principle is the constraint that size, whether grain size or structure size, puts on allowed dislocation curvature.
A new method to measure torsion moments on small-scaled specimens.
TLDR
A new method is presented, which allows determining torsion moments applied to wires as thin as 10 μm in monotonic as well as cyclic manner, and investigations on gold wires with diameters ranging from 10 to 60 μm, applying torsions in the nNm regime are shown.
Anomalous plasticity in the cyclic torsion of micron scale metallic wires.
TLDR
The plasticity of micron scale Cu and Au wires under cyclic torsions is investigated for the first time by using a torsion balance technique and a distinct Bauschinger effect and an anomalous plastic recovery are unambiguously revealed.
Quasi-Static Torsion Characterization of Micro-diameter Copper Wires
A method to measure very small torques that subject micro-diameter copper wires to plasticity is developed for quasi-static torsion experiment. Following the concept in the work by Fleck et al. (Acta
Characterizing Torsional Properties of Microwires Using an Automated Torsion Balance
In order to characterize the torsional behavior of microwires, an automated torsion tester is established based on the principle of torsion balance. The main challenges in developing a torsion tester
Direct measurement of torsional properties of single fibers
In order to characterize the torsional behavior of micron-scale specimens, a direct technique is established based on the principle of torsion balance. The technique applies twist to the specimen and
Size effects in yield and plasticity under uniaxial and non-uniform loading: experiment and theory
The size of microstructural features has long been known to determine the strength of materials, as in the Hall–Petch effect of grain size. More recently, the importance of the size of the structure
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