Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities
Abstract Crack initiation emerges due to a combination of elasticity, plasticity, and disorder, and it displays strong dependence on the material’s microstructural details. The characterization of the structural uncertainty in the original microstructure is typically empirical and systematic charact...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-11-01
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| Series: | Materials Theory |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s41313-019-0017-0 |
| _version_ | 1811325437402415104 |
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| author | S. Papanikolaou P. Shanthraj J. Thibault C. Woodward F. Roters |
| author_facet | S. Papanikolaou P. Shanthraj J. Thibault C. Woodward F. Roters |
| author_sort | S. Papanikolaou |
| collection | DOAJ |
| description | Abstract Crack initiation emerges due to a combination of elasticity, plasticity, and disorder, and it displays strong dependence on the material’s microstructural details. The characterization of the structural uncertainty in the original microstructure is typically empirical and systematic characterization protocols are lacking. In this paper, we propose an investigational tool in the form of the curvature of an ellipsoidal notch: As the radius of curvature at the notch increases, there is a dynamic phase transition from notch-induced crack initiation to disorder-induced crack nucleation. We argue that the this transition may unveil the characteristic length scale of structural disorder in the material. We investigate brittle but elastoplastic metals with continuum, microstructural disorder that could originate in a manufacturing process, such as alloying. We perform extensive and realistic simulations, using a phase-field approach coupled to crystal plasticity, where microstructural disorder and notch width are systematically varied. We identify the brittle-to-quasi-brittle transition for various disorder strengths in terms of the damage and stress evolution. Moreover, we investigate precursors to crack initiation that we quantify in terms of the expected stress drops during displacement control loading. |
| first_indexed | 2024-04-13T14:33:06Z |
| format | Article |
| id | doaj.art-aa69ae26618f4f9f87b24632147c9ad3 |
| institution | Directory Open Access Journal |
| issn | 2509-8012 |
| language | English |
| last_indexed | 2024-04-13T14:33:06Z |
| publishDate | 2019-11-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Materials Theory |
| spelling | doaj.art-aa69ae26618f4f9f87b24632147c9ad32022-12-22T02:43:07ZengSpringerOpenMaterials Theory2509-80122019-11-013112310.1186/s41313-019-0017-0Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural InhomogeneitiesS. Papanikolaou0P. Shanthraj1J. Thibault2C. Woodward3F. Roters4Department of Mechanical & Aerospace Engineering, West Virginia UniversityMax-Planck-Institut für EisenforschungDepartment of Mechanical & Aerospace Engineering, West Virginia UniversityMaterials and Manufacturing Directorate, Air Force Research Laboratory, Wright Patterson Air Force BaseMax-Planck-Institut für EisenforschungAbstract Crack initiation emerges due to a combination of elasticity, plasticity, and disorder, and it displays strong dependence on the material’s microstructural details. The characterization of the structural uncertainty in the original microstructure is typically empirical and systematic characterization protocols are lacking. In this paper, we propose an investigational tool in the form of the curvature of an ellipsoidal notch: As the radius of curvature at the notch increases, there is a dynamic phase transition from notch-induced crack initiation to disorder-induced crack nucleation. We argue that the this transition may unveil the characteristic length scale of structural disorder in the material. We investigate brittle but elastoplastic metals with continuum, microstructural disorder that could originate in a manufacturing process, such as alloying. We perform extensive and realistic simulations, using a phase-field approach coupled to crystal plasticity, where microstructural disorder and notch width are systematically varied. We identify the brittle-to-quasi-brittle transition for various disorder strengths in terms of the damage and stress evolution. Moreover, we investigate precursors to crack initiation that we quantify in terms of the expected stress drops during displacement control loading.http://link.springer.com/article/10.1186/s41313-019-0017-0Microstructural disorderCrack initiationFractalsquasi-brittle fractureDAMASKAvalanches |
| spellingShingle | S. Papanikolaou P. Shanthraj J. Thibault C. Woodward F. Roters Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities Materials Theory Microstructural disorder Crack initiation Fractals quasi-brittle fracture DAMASK Avalanches |
| title | Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities |
| title_full | Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities |
| title_fullStr | Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities |
| title_full_unstemmed | Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities |
| title_short | Brittle to quasi-brittle transition and crack initiation precursors in crystals with structural Inhomogeneities |
| title_sort | brittle to quasi brittle transition and crack initiation precursors in crystals with structural inhomogeneities |
| topic | Microstructural disorder Crack initiation Fractals quasi-brittle fracture DAMASK Avalanches |
| url | http://link.springer.com/article/10.1186/s41313-019-0017-0 |
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