Anisotropic ductile fracture: experiments, modeling, and numerical simulations
The continuous hot rolling process induces anisotropy in the plastic yield and flow and results in an anisotropic ductile fracture. In this study, experiments, including uniaxial in-plane tension tests and shear tests of butterfly specimens along different material orientations, were performed, and...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S223878542201167X |
| _version_ | 1811199272054423552 |
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| author | Hongfei Wu Xincun Zhuang Wen Zhang Zhen Zhao |
| author_facet | Hongfei Wu Xincun Zhuang Wen Zhang Zhen Zhao |
| author_sort | Hongfei Wu |
| collection | DOAJ |
| description | The continuous hot rolling process induces anisotropy in the plastic yield and flow and results in an anisotropic ductile fracture. In this study, experiments, including uniaxial in-plane tension tests and shear tests of butterfly specimens along different material orientations, were performed, and microscopic observations were used to determine the differences in damage mechanisms. The Yld91 anisotropic yield stress was introduced into the extended isotropic Gurson-Tvergaard-Needleman (GTN) model, and the associated flow rule (AFR) and non-associated flow rule (NAFR) were adopted to formulate two anisotropic GTN models. Anisotropic GTN models were implemented in finite element software via user subroutines, and were used to predict the fracture initiation of Al2024-T351. For different plastic flow rules, the anisotropic parameters were calibrated using the anisotropic stress and Lankford coefficients. An inverse analysis with a two-stage optimization algorithm was adopted to calibrate the damage-related parameters. Moreover, an extended isotropic GTN model was adopted for comparison. The prediction accuracy of the proposed anisotropic GTN models was evaluated by analyzing the load responses and displacements at fracture for various specimens and material orientations. The good conformation between the experimental results and numerical predictions verifies the predictive ability of the proposed models to a certain degree. In addition, some suggestions and conclusions are provided for the formulation of an advanced anisotropic GTN model with enhanced accuracy. |
| first_indexed | 2024-04-12T01:45:06Z |
| format | Article |
| id | doaj.art-a1547a4caa2346dc881f133cc413b3ce |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-12T01:45:06Z |
| publishDate | 2022-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-a1547a4caa2346dc881f133cc413b3ce2022-12-22T03:53:05ZengElsevierJournal of Materials Research and Technology2238-78542022-09-0120833856Anisotropic ductile fracture: experiments, modeling, and numerical simulationsHongfei Wu0Xincun Zhuang1Wen Zhang2Zhen Zhao3Institute of Forming Technology and Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, ChinaInstitute of Forming Technology and Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; Corresponding author.State Key Laboratory of Mechanical System and Vibration, Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai, 200240, ChinaInstitute of Forming Technology and Equipment, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, China; National Engineering Research Center of Die & Mold CAD, Shanghai Jiao Tong University, Shanghai 200030, ChinaThe continuous hot rolling process induces anisotropy in the plastic yield and flow and results in an anisotropic ductile fracture. In this study, experiments, including uniaxial in-plane tension tests and shear tests of butterfly specimens along different material orientations, were performed, and microscopic observations were used to determine the differences in damage mechanisms. The Yld91 anisotropic yield stress was introduced into the extended isotropic Gurson-Tvergaard-Needleman (GTN) model, and the associated flow rule (AFR) and non-associated flow rule (NAFR) were adopted to formulate two anisotropic GTN models. Anisotropic GTN models were implemented in finite element software via user subroutines, and were used to predict the fracture initiation of Al2024-T351. For different plastic flow rules, the anisotropic parameters were calibrated using the anisotropic stress and Lankford coefficients. An inverse analysis with a two-stage optimization algorithm was adopted to calibrate the damage-related parameters. Moreover, an extended isotropic GTN model was adopted for comparison. The prediction accuracy of the proposed anisotropic GTN models was evaluated by analyzing the load responses and displacements at fracture for various specimens and material orientations. The good conformation between the experimental results and numerical predictions verifies the predictive ability of the proposed models to a certain degree. In addition, some suggestions and conclusions are provided for the formulation of an advanced anisotropic GTN model with enhanced accuracy.http://www.sciencedirect.com/science/article/pii/S223878542201167XAnisotropic ductile fractureMicroscopic observationsAnisotropic yield stressPlastic flow ruleAnisotropic GTN model |
| spellingShingle | Hongfei Wu Xincun Zhuang Wen Zhang Zhen Zhao Anisotropic ductile fracture: experiments, modeling, and numerical simulations Journal of Materials Research and Technology Anisotropic ductile fracture Microscopic observations Anisotropic yield stress Plastic flow rule Anisotropic GTN model |
| title | Anisotropic ductile fracture: experiments, modeling, and numerical simulations |
| title_full | Anisotropic ductile fracture: experiments, modeling, and numerical simulations |
| title_fullStr | Anisotropic ductile fracture: experiments, modeling, and numerical simulations |
| title_full_unstemmed | Anisotropic ductile fracture: experiments, modeling, and numerical simulations |
| title_short | Anisotropic ductile fracture: experiments, modeling, and numerical simulations |
| title_sort | anisotropic ductile fracture experiments modeling and numerical simulations |
| topic | Anisotropic ductile fracture Microscopic observations Anisotropic yield stress Plastic flow rule Anisotropic GTN model |
| url | http://www.sciencedirect.com/science/article/pii/S223878542201167X |
| work_keys_str_mv | AT hongfeiwu anisotropicductilefractureexperimentsmodelingandnumericalsimulations AT xincunzhuang anisotropicductilefractureexperimentsmodelingandnumericalsimulations AT wenzhang anisotropicductilefractureexperimentsmodelingandnumericalsimulations AT zhenzhao anisotropicductilefractureexperimentsmodelingandnumericalsimulations |