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Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling.

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Title: Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling.
Authors: Chen, Xiang1 (AUTHOR), Zou, Weiqian1 (AUTHOR), Pu, Junran1 (AUTHOR), Qu, Yongzheng1 (AUTHOR), Kang, Xi1 (AUTHOR) kangxi@cqupt.edu.cn, Zhao, Yang1 (AUTHOR)
Source: Phase Transitions. Aug2026, p1-22. 22p. 10 Illustrations.
Subject Terms: *Shape memory alloys, *Material plasticity, *Mechanical behavior of materials, *Stress-strain curves, *Martensitic transformations, *Energy dissipation
Abstract: A constitutive model coupling martensitic transformation and plastic deformation was implemented as a UMAT in ABAQUS to simulate spherical indentation of NiTi shape memory alloys. Four material states—superelastic (SE), superelastic with plasticity (SE-P), shape memory effect (SME), and SME with plasticity (SME-P)—were compared under identical elastic modulus, transformation stress, and strain conditions. Plasticity reduces depth recovery, increases hysteresis energy dissipation, and shrinks the effective transformation zone. In SE/SE-P, unloading begins elastically and subsequent inflection points are governed by reverse transformation. In SME/SME-P, reverse transformation does not occur during unloading; heating enables additional recovery, while residual indentation remains with plastic deformation. The model also reproduces the experimentally observed decrease in reverse-transformation stress with increasing tensile pre-strain. It provides a continuum-averaged description of indentation recovery, while grain-scale heterogeneity, dislocation structures, surface oxide, and roughness require further investigation. [ABSTRACT FROM AUTHOR]
Database: Academic Search Index
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  Label: Title
  Group: Ti
  Data: Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling.
– Name: Author
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  Data: <searchLink fieldCode="AR" term="%22Chen%2C+Xiang%22">Chen, Xiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zou%2C+Weiqian%22">Zou, Weiqian</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pu%2C+Junran%22">Pu, Junran</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Qu%2C+Yongzheng%22">Qu, Yongzheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kang%2C+Xi%22">Kang, Xi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> kangxi@cqupt.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Yang%22">Zhao, Yang</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Phase+Transitions%22">Phase Transitions</searchLink>. Aug2026, p1-22. 22p. 10 Illustrations.
– Name: Subject
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  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Shape+memory+alloys%22">Shape memory alloys</searchLink><br />*<searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink><br />*<searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br />*<searchLink fieldCode="DE" term="%22Stress-strain+curves%22">Stress-strain curves</searchLink><br />*<searchLink fieldCode="DE" term="%22Martensitic+transformations%22">Martensitic transformations</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: A constitutive model coupling martensitic transformation and plastic deformation was implemented as a UMAT in ABAQUS to simulate spherical indentation of NiTi shape memory alloys. Four material states—superelastic (SE), superelastic with plasticity (SE-P), shape memory effect (SME), and SME with plasticity (SME-P)—were compared under identical elastic modulus, transformation stress, and strain conditions. Plasticity reduces depth recovery, increases hysteresis energy dissipation, and shrinks the effective transformation zone. In SE/SE-P, unloading begins elastically and subsequent inflection points are governed by reverse transformation. In SME/SME-P, reverse transformation does not occur during unloading; heating enables additional recovery, while residual indentation remains with plastic deformation. The model also reproduces the experimentally observed decrease in reverse-transformation stress with increasing tensile pre-strain. It provides a continuum-averaged description of indentation recovery, while grain-scale heterogeneity, dislocation structures, surface oxide, and roughness require further investigation. [ABSTRACT FROM AUTHOR]
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      – Type: doi
        Value: 10.1080/01411594.2026.2715413
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      – Code: eng
        Text: English
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        PageCount: 22
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      – SubjectFull: Shape memory alloys
        Type: general
      – SubjectFull: Material plasticity
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Stress-strain curves
        Type: general
      – SubjectFull: Martensitic transformations
        Type: general
      – SubjectFull: Energy dissipation
        Type: general
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      – TitleFull: Study on indentation characteristics of shape memory alloys considering transformation-plasticity coupling.
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            NameFull: Chen, Xiang
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            NameFull: Zou, Weiqian
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            NameFull: Pu, Junran
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            NameFull: Qu, Yongzheng
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            NameFull: Kang, Xi
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            NameFull: Zhao, Yang
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            – D: 11
              M: 08
              Text: Aug2026
              Type: published
              Y: 2026
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              Value: 01411594
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            – TitleFull: Phase Transitions
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