Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 221, Issue -, Pages 77-91Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2020.04.006
Keywords
Microstructures; Martensitic transformation; Size effects; Incremental energy minimization; Propagating instabilities
Categories
Funding
- National Science Center (NCN) in Poland [2018/29/B/ST8/00729]
Ask authors/readers for more resources
The study investigates the effect of stress-induced martensitic microstructures on macroscopic mechanical properties of shape memory alloys in the pseudoelastic regime, considering size-dependent energy of interfaces. Multiscale analysis reveals that interfacial energy storage and dissipation strongly influence the shape and width of stress-strain hysteresis loops. Experimental and predicted results show high similarity in shape and width variations.
The effect of formation and evolution of stress-induced martensitic microstructures on macroscopic mechanical properties of shape memory alloys in the pseudoelastic regime is investigated with account for size-dependent energy of interfaces. A quantitative relationship is established between the changes in free energy and dissipation on the interfaces at three microstructural scales and the overall mechanical characteristic of the material under tensile loading. The multiscale analysis carried out for a polycrystalline NiTi shape memory alloy has revealed that the interfacial energy storage and dissipation can strongly affect the shape and width of the stress-strain hysteresis loop. The predicted non-monotonic stress-strain response for the material of a selected grain size shows a remarkable similarity to the experimental one extracted from a tensile test of a laminate by Hallai and Kyriakides (2013). By the classical Maxwell construction, the non-monotonic response for a material element results in a commonly observed stress plateau for a tensile specimen, which is associated with the propagation of phase transformation fronts. This behaviour is confirmed with striking accuracy by 3D finite-element computations performed for a macroscopic tensile specimen, in which propagating instability bands are treated explicitly. (C) 2020 Institute of Fundamental Technological Research PAS. Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available