{"title":"A semi-empirical model for fracture energy evaluation of a Ni2MnGa magnetic shape memory alloy","authors":"Glen J. D’Silva, Constantin Ciocanel","doi":"10.1007/s10704-025-00875-x","DOIUrl":null,"url":null,"abstract":"<div><p>Ni<sub>2</sub>MnGa magnetic shape memory alloys (MSMAs) experience the shape memory effect due to magnetic field-induced or mechanical stress-induced microstructure reorientation. However, crack initiation and propagation, influenced by the evolving twin microstructure under coupled magneto-mechanical loading, can significantly hamper its function in applications. This study presents a semi-empirical approach to evaluate fracture toughness and fracture energy in Ni<sub>2</sub>MnGa using Vickers microindentation. An improved analytical expression is proposed, extending the classical indentation-based fracture model to incorporate magneto-mechanical effects and microstructural evolution through a stress and field dependent exponential term. Experimental results confirm that the transverse magnetic field facilitates crack growth, decreasing the fracture energy, while axial compressive stress impedes crack growth, increasing the fracture energy of the alloy. The proposed empirical relationship provides configuration-specific fracture energy values for the alloy and contributes to identifying loading conditions least conducive to fracture initiation and growth in MSMAs.</p></div>","PeriodicalId":590,"journal":{"name":"International Journal of Fracture","volume":"249 3","pages":""},"PeriodicalIF":2.5000,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Fracture","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10704-025-00875-x","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Ni2MnGa magnetic shape memory alloys (MSMAs) experience the shape memory effect due to magnetic field-induced or mechanical stress-induced microstructure reorientation. However, crack initiation and propagation, influenced by the evolving twin microstructure under coupled magneto-mechanical loading, can significantly hamper its function in applications. This study presents a semi-empirical approach to evaluate fracture toughness and fracture energy in Ni2MnGa using Vickers microindentation. An improved analytical expression is proposed, extending the classical indentation-based fracture model to incorporate magneto-mechanical effects and microstructural evolution through a stress and field dependent exponential term. Experimental results confirm that the transverse magnetic field facilitates crack growth, decreasing the fracture energy, while axial compressive stress impedes crack growth, increasing the fracture energy of the alloy. The proposed empirical relationship provides configuration-specific fracture energy values for the alloy and contributes to identifying loading conditions least conducive to fracture initiation and growth in MSMAs.
期刊介绍：
The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications.
The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged.
In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.
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