Capturing and Micromechanical Analysis of the Crack-Branching Behavior in Welded Joints
Abstract
:1. Introduction
2. The Designed Crack-Branching Model
2.1. The First Crack-Branching Model
2.2. The Second Crack-Branching Model
2.3. The Third Crack-Branching Model
3. Finite Element Numerical Calculation
4. Verification of the Gurson-Tvergaard-Needleman Damage Model by Experimental Results
5. Results and Discussion
5.1. The First Crack-Branching Model
5.2. The Second Crack-Branching Model
5.3. The Third Crack-Branching Model
5.4. Crack-Branching Mechanism
6. Conclusions
- (1)
- With gradual increasing of the strength mismatch, crack-branching behavior becomes more apparent. Not just the quantity of the branches increases, the branch can even grow along with the direction perpendicular to the initial crack.
- (2)
- The similar strength mismatch on each side of the crack is a sufficient but not necessary condition for crack branching. As long as there is another large enough propagation trend that is different from the original crack propagation direction, crack-branching behavior occurs. A high strength mismatch that is induced by both the mechanical properties and dimensions of different regions is the key of crack branching in welded joints.
- (3)
- Each crack branching is accompanied by three local high stress concentrations at the crack tip. Three pulling forces that are created by the three local high stress concentrations pull the crack propagation along with the directions of stress concentrations. Under the combined action of the three pulling forces, crack branching occurs, and two new cracks initiate from the middle of the pulling forces.
- (4)
- The finite element method based on the GTN damage model is an effective method to simulate the crack-branching behavior in welded joints during the crack propagation process.
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Wang, W.; Yang, J.; Chen, H.; Yang, Q. Capturing and Micromechanical Analysis of the Crack-Branching Behavior in Welded Joints. Metals 2020, 10, 1308. https://doi.org/10.3390/met10101308
Wang W, Yang J, Chen H, Yang Q. Capturing and Micromechanical Analysis of the Crack-Branching Behavior in Welded Joints. Metals. 2020; 10(10):1308. https://doi.org/10.3390/met10101308
Chicago/Turabian StyleWang, Wenjie, Jie Yang, Haofeng Chen, and Qianyu Yang. 2020. "Capturing and Micromechanical Analysis of the Crack-Branching Behavior in Welded Joints" Metals 10, no. 10: 1308. https://doi.org/10.3390/met10101308