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QUEEN MARY UNIVERSITY OF LONDON
|Coordinator Country||United Kingdom [UK]|
|Total cost||146˙591 €|
|EC max contribution||146˙591 € (100%)|
1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
|Duration (year-month-day)||from 2016-08-01 to 2018-01-31|
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|1||QUEEN MARY UNIVERSITY OF LONDON||UK (LONDON)||coordinator||146˙591.00|
The size effects (smaller is stronger) and Bauschinger effects (plastic recovery) at room temperature have been extensively documented experimentally at the micro/nano-scale. However, the underlying deformation mechanisms remain ambiguous, particularly in the presence of strain gradients. In this project, we intend to develop an integrated micro-torsion and micro-tension technique with a heating and temperature-control element for investigating the mechanical behavior of micro-scale metallic wires/tubes at elevated temperatures. We study all three size effects, due to the grain size, due to nonuniform deformation, and due to the wire diameter, and their coupling effects, using samples with different diameters (or wall thickness) and controlled grain sizes. The Fellow has reported the first observation of anomalous plasticity in the cyclic torsion of micro-scale metallic wires at room temperature. However, there have been no reports on the phenomenon in the cyclic torsion of small volumes at elevated temperatures. In this proposal, we plan to perform the (cyclic) torsion tests on micron-scale metallic wires and tubes which are heated in situ by passing an electrical current, and then to analyze the relation between plastic recovery and temperature. A long term goal is to exploit the size effect in novel high-strength, lightweight materials through “length-scale engineering”. The main objectives are: • To integrate the different micro-torsion/tension experimental methods, and so that it can be used at high temperatures. • To perform (cyclic) torsion and tension tests on thin metallic wires/tubes at elevated temperature. • To integrate the complementary theoretical methods, used to understand the corresponding physical mechanisms for the observed phenomena. • To test existing theories for micro-scale plasticity by using the homemade samples, e.g. thin wires/tubes prepared with different grain sizes and diameters.
|year||authors and title||journal||last update|
Dabiao Liu, Kai Peng, Yuming He
Direct measurement of torsional properties of single fibers
published pages: 115017, ISSN: 0957-0233, DOI: 10.1088/0957-0233/27/11/115017
|Measurement Science and Technology 27/11||2019-06-13|
Dabiao Liu, D.J. Dunstan
Material length scale of strain gradient plasticity: A physical interpretation
published pages: 156-174, ISSN: 0749-6419, DOI: 10.1016/j.ijplas.2017.07.007
|International Journal of Plasticity 98||2019-06-13|
Dabiao Liu, Longteng Yu, Yuming He, Kai Peng, Jie Liu, Juan Guan, D. J. Dunstan
Peculiar torsion dynamical response of spider dragline silk
published pages: 13701, ISSN: 0003-6951, DOI: 10.1063/1.4990676
|Applied Physics Letters 111/1||2019-06-13|
Shimin Zheng, Dabiao Liu, Yuming He
The influence of fiber migration on the mechanical properties of yarns with hierarchical helical structures
published pages: 88-105, ISSN: 0309-3247, DOI: 10.1177/0309324717750951
|The Journal of Strain Analysis for Engineering Design 53/2||2019-06-13|
Dabiao Liu, Xu Zhang, Yuan Li, D.J. Dunstan
Critical thickness phenomenon in single-crystalline wires under torsion
published pages: 213-23, ISSN: 1359-6454, DOI: 10.1016/j.actamat.2018.03.022
|Acta Materialia 150||2019-06-13|
D. Liu, Y. He, P. Hu, H. Ding
Characterizing Torsional Properties of Microwires Using an Automated Torsion Balance
published pages: 297-311, ISSN: 0014-4851, DOI: 10.1007/s11340-016-0212-8
|Experimental Mechanics 57/2||2019-06-13|
D.J. Dunstan, Dabiao Liu
Why abseiling spiders donâ€™t spin out of control â€“ new research
published pages: , ISSN: , DOI:
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