Variational Thermomechanically Coupled Shape Memory Alloy Material Model and Optimization of Shape Memory Alloy Based Out‐of‐Plane Bistable Microactuator.
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| Title: | Variational Thermomechanically Coupled Shape Memory Alloy Material Model and Optimization of Shape Memory Alloy Based Out‐of‐Plane Bistable Microactuator. |
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| Authors: | Babar Shamim, Muhammad1 (AUTHOR), Goldbeck, Hauke1 (AUTHOR) hago@tf.uni-kiel.de, Wulfinghoff, Stephan1 (AUTHOR) |
| Source: | International Journal for Numerical Methods in Engineering. 2/15/2026, Vol. 127 Issue 3, p1-31. 31p. |
| Subjects: | Shape memory alloys, Microactuators, Thermomechanical properties of metals, Conservation of energy, Martensitic transformations, Newton-Raphson method |
| Abstract: | This work presents a fully thermomechanically coupled material model for shape memory alloys (SMAs), capable of predicting shape memory effect, superelasticity, stress and strain recovery, and martensite reorientation. Formulated within the Generalized Standard Material (GSM) framework, the model employs a rate potential, whose variations yield the governing equations, including linear momentum balance, energy balance, and evolution of internal variables. A potential‐based line search method integrated with a Newton–Raphson scheme enhances the robustness and convergence of the solution algorithm. Extending the Sedlák [14] model's energy and dissipation formulations, we apply the proposed framework to an SMA‐based out‐of‐plane bistable microactuator design. The actuator features two antagonistically coupled SMA microbridges and exhibits bistable behavior, snapping between stable states under thermomechanical loading and using constrained recovery forces to perform work. Results demonstrate the model's efficiency and accuracy in capturing the complex thermomechanical response of SMA devices, highlighting its potential for advanced bistable actuator design. [ABSTRACT FROM AUTHOR] |
| Copyright of International Journal for Numerical Methods in Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 191491093 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Variational Thermomechanically Coupled Shape Memory Alloy Material Model and Optimization of Shape Memory Alloy Based Out‐of‐Plane Bistable Microactuator. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Babar+Shamim%2C+Muhammad%22">Babar Shamim, Muhammad</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Goldbeck%2C+Hauke%22">Goldbeck, Hauke</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> hago@tf.uni-kiel.de</i><br /><searchLink fieldCode="AR" term="%22Wulfinghoff%2C+Stephan%22">Wulfinghoff, Stephan</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+for+Numerical+Methods+in+Engineering%22">International Journal for Numerical Methods in Engineering</searchLink>. 2/15/2026, Vol. 127 Issue 3, p1-31. 31p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Shape+memory+alloys%22">Shape memory alloys</searchLink><br /><searchLink fieldCode="DE" term="%22Microactuators%22">Microactuators</searchLink><br /><searchLink fieldCode="DE" term="%22Thermomechanical+properties+of+metals%22">Thermomechanical properties of metals</searchLink><br /><searchLink fieldCode="DE" term="%22Conservation+of+energy%22">Conservation of energy</searchLink><br /><searchLink fieldCode="DE" term="%22Martensitic+transformations%22">Martensitic transformations</searchLink><br /><searchLink fieldCode="DE" term="%22Newton-Raphson+method%22">Newton-Raphson method</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This work presents a fully thermomechanically coupled material model for shape memory alloys (SMAs), capable of predicting shape memory effect, superelasticity, stress and strain recovery, and martensite reorientation. Formulated within the Generalized Standard Material (GSM) framework, the model employs a rate potential, whose variations yield the governing equations, including linear momentum balance, energy balance, and evolution of internal variables. A potential‐based line search method integrated with a Newton–Raphson scheme enhances the robustness and convergence of the solution algorithm. Extending the Sedlák [14] model's energy and dissipation formulations, we apply the proposed framework to an SMA‐based out‐of‐plane bistable microactuator design. The actuator features two antagonistically coupled SMA microbridges and exhibits bistable behavior, snapping between stable states under thermomechanical loading and using constrained recovery forces to perform work. Results demonstrate the model's efficiency and accuracy in capturing the complex thermomechanical response of SMA devices, highlighting its potential for advanced bistable actuator design. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of International Journal for Numerical Methods in Engineering is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/nme.70263 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 31 StartPage: 1 Subjects: – SubjectFull: Shape memory alloys Type: general – SubjectFull: Microactuators Type: general – SubjectFull: Thermomechanical properties of metals Type: general – SubjectFull: Conservation of energy Type: general – SubjectFull: Martensitic transformations Type: general – SubjectFull: Newton-Raphson method Type: general Titles: – TitleFull: Variational Thermomechanically Coupled Shape Memory Alloy Material Model and Optimization of Shape Memory Alloy Based Out‐of‐Plane Bistable Microactuator. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Babar Shamim, Muhammad – PersonEntity: Name: NameFull: Goldbeck, Hauke – PersonEntity: Name: NameFull: Wulfinghoff, Stephan IsPartOfRelationships: – BibEntity: Dates: – D: 15 M: 02 Text: 2/15/2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00295981 Numbering: – Type: volume Value: 127 – Type: issue Value: 3 Titles: – TitleFull: International Journal for Numerical Methods in Engineering Type: main |
| ResultId | 1 |
