Evaluation of ductile fracture toughness for Mode I cracks subject to three-dimensional constraint conditions
•Propose a model for 3D-constrained cracks to capture J-integral–load relations.•Present models to depict stress, stress triaxiality distribution at crack tips.•Offer a critical fracture criterion for ductile materials under high constraint.•Develop a new method to quantitatively evaluate fracture t...
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| Published in | Engineering fracture mechanics Vol. 322; p. 111157 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
12.06.2025
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| Subjects | |
| Online Access | Get full text |
| ISSN | 0013-7944 |
| DOI | 10.1016/j.engfracmech.2025.111157 |
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| Abstract | •Propose a model for 3D-constrained cracks to capture J-integral–load relations.•Present models to depict stress, stress triaxiality distribution at crack tips.•Offer a critical fracture criterion for ductile materials under high constraint.•Develop a new method to quantitatively evaluate fracture toughness.
Evaluating the properties related to the fracture mechanics and behavior of cracked structures is pivotal in structural integrity analysis. Accurate theoretical predictions and experimental methods for determining fracture toughness are significant in advancing the fracture strength theory of ductile materials and addressing fracture-related issues in such structures. This study developed models that reflect the dimensionless relationships among load, J-integral, maximum principal stress, and stress triaxiality for Mode I cracked specimens under three-dimensional constraints. These models are developed for ductile materials conforming to the Ramberg–Osgood law based on energy density equivalence and finite element analysis. Combined with the critical fracture criterion under high constraints, an effective method for quantitatively evaluating the fracture toughness of Mode I cracks under three-dimensional constraints was established. Notably, the trends observed in the derived critical J-integral vs. thickness relations align with conventional fracture test results. This research can aid in the accurate predictions of the fracture behavior for ductile structural materials under differing levels of crack tip constraint. |
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| AbstractList | •Propose a model for 3D-constrained cracks to capture J-integral–load relations.•Present models to depict stress, stress triaxiality distribution at crack tips.•Offer a critical fracture criterion for ductile materials under high constraint.•Develop a new method to quantitatively evaluate fracture toughness.
Evaluating the properties related to the fracture mechanics and behavior of cracked structures is pivotal in structural integrity analysis. Accurate theoretical predictions and experimental methods for determining fracture toughness are significant in advancing the fracture strength theory of ductile materials and addressing fracture-related issues in such structures. This study developed models that reflect the dimensionless relationships among load, J-integral, maximum principal stress, and stress triaxiality for Mode I cracked specimens under three-dimensional constraints. These models are developed for ductile materials conforming to the Ramberg–Osgood law based on energy density equivalence and finite element analysis. Combined with the critical fracture criterion under high constraints, an effective method for quantitatively evaluating the fracture toughness of Mode I cracks under three-dimensional constraints was established. Notably, the trends observed in the derived critical J-integral vs. thickness relations align with conventional fracture test results. This research can aid in the accurate predictions of the fracture behavior for ductile structural materials under differing levels of crack tip constraint. |
| ArticleNumber | 111157 |
| Author | Cai, Lixun Chen, Hui Yu, Simiao |
| Author_xml | – sequence: 1 givenname: Simiao orcidid: 0000-0002-3129-2400 surname: Yu fullname: Yu, Simiao organization: School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, PR China – sequence: 2 givenname: Lixun surname: Cai fullname: Cai, Lixun email: lix_cai@263.net organization: Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Aerospace Engineering, Southwest Jiaotong University, Chengdu 610031, PR China – sequence: 3 givenname: Hui surname: Chen fullname: Chen, Hui organization: School of Civil and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114, PR China |
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| Keywords | Ductile fracture criterion Mode I cracks Maximum principal stress Three-dimensional constraints Critical fracture toughness |
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| Snippet | •Propose a model for 3D-constrained cracks to capture J-integral–load relations.•Present models to depict stress, stress triaxiality distribution at crack... |
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| SubjectTerms | Critical fracture toughness Ductile fracture criterion Maximum principal stress Mode I cracks Three-dimensional constraints |
| Title | Evaluation of ductile fracture toughness for Mode I cracks subject to three-dimensional constraint conditions |
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