Yuchen Zhang
(, ), Weilong Yang
(, ), Xin Yang
(, ), Jin Wang
(, ), Chao Lv
(, ), Hao Zhang
(, ), Xiaoyang Pei
(, ), Fang Wang
(, )
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引用次数: 0
Abstract
This work investigates the dynamic response of a monocrystalline nickel-titanium (NiTi) alloy at the atomic scale. The results deduced from non-equilibrium molecular dynamics modeling demonstrate that no shear deformation band (SDB) appears in the sample at an impact velocity of less than 0.75 km/s. As this velocity increases, shear deformations become pronouncedly localized, and the average spacing between SDBs decreases until it stabilizes. Combining shear stress and particle velocity profiles, the survival of SDBs is found to be closely associated with plastic deformation. The dislocations clustering around SDBs predominantly exhibit 〈100〉 partial dislocations, whereas 1/2〈111〉 full dislocations are dominant in those regions without SDBs. Void nucleation always occurs on SDBs. Subsequently, void growth promotes a change in the SDB distribution characteristic. For the case without SDB, voids are randomly nucleated, and the void growth exhibits a non-uniform manner. Thus, there is an interaction between shear localization and void evolution in the NiTi alloy subjected to intensive loading. This study is expected to provide in-depth insights into the microscopic mechanism of NiTi dynamic damage.
期刊介绍:
Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences.
Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences.
In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest.
Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics