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NON-LOCAL MODELING ON MACROSCOPIC DOMAIN PATTERNS IN PHASE TRANSFORMATION OF NiTi TUBES
Authors:Yongjun He Qingping Sun
Institution:Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
Abstract:Recent experiments 1]revealed many new phenomena of the macroscopic domain patterns in the stress-induced phase transformation of a superelastic polycrystalline NiTi tube during tensile loading.The new phenomena include deformation instability with the formation of a helical domain,domain topology transition from helix to cylinder,domain-front branching and loading-path dependence of domain patterns.In this paper,we model the polycrystal as an elastic continuum with nonconvex strain energy 2]and adopt the...
Keywords:martensitic phase transition  macroscopic domain patterns  NiTi polycrystalline tubes  non-local and nonconvex elasticity  tube-wall thickness effect  metastability and instability
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