title: Mechanical Failure Mode of Metal Nanowires: Global Deformation versus Local Deformation.
abstract: It is believed that the failure mode of metal nanowires under tensile loading is the result of the nucleation and propagation of dislocations. Such failure modes can be slip, partial slip or twinning and therefore they are regarded as local deformation. Here we provide numerical and theoretical evidences to show that global deformation is another predominant failure mode of nanowires under tensile loading. At the global deformation mode, nanowires fail with a large contraction along a lateral direction and a large expansion along the other lateral direction. In addition, there is a competition between global and local deformations. Nanowires loaded at low temperature exhibit global failure mode first and then local deformation follows later. We show that the global deformation originates from the intrinsic instability of the nanowires and that temperature is a main parameter that decides the global or local deformation as the failure mode of nanowires.
authors.affiliation: 1] Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea [2] Multiscale and Multiphysics Simulation Group and Low-Dimensional Carbon Material Center, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
authors.forename: Duc Tam
authors.initials: DT
authors.lastname: Ho
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
authors.forename: Youngtae
authors.initials: Y
authors.lastname: Im
authors.affiliation: 1] School of Materials Science and Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea [2] Multiscale and Multiphysics Simulation Group and Low-Dimensional Carbon Material Center, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
authors.forename: Soon-Yong
authors.initials: SY
authors.lastname: Kwon
authors.affiliation: Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea.
authors.forename: Youn Young
authors.initials: YY
authors.lastname: Earmme
authors.affiliation: 1] Department of Mechanical Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea [2] Multiscale and Multiphysics Simulation Group and Low-Dimensional Carbon Material Center, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Korea.
authors.forename: Sung Youb
authors.initials: SY
authors.lastname: Kim