Capturing and micromechanical analysis of the crack-branching behavior in welded joints
| Autor: | Haofeng Chen, Qianyu Yang, Wenjie Wang, Jie Yang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Ductile materials 02 engineering and technology Welding Branching (polymer chemistry) welded joints law.invention Brittleness 0203 mechanical engineering law General Materials Science stress concentration lcsh:Mining engineering. Metallurgy Bifurcation Stress concentration micromechanical analysis Metals and Alloys Fracture mechanics Mechanics 021001 nanoscience & nanotechnology crack branching behavior 020303 mechanical engineering & transports Dynamic loading crack propagation path TJ 0210 nano-technology |
| Zdroj: | Metals Volume 10 Issue 10 Metals, Vol 10, Iss 1308, p 1308 (2020) |
| ISSN: | 2075-4701 |
| Popis: | During the crack propagation process, the crack-branching behavior makes fracture more unpredictable. However, compared with the crack-branching behavior that occurs in brittle materials or ductile materials under dynamic loading, the branching behavior has been rarely reported in welded joints under quasi-static loading. Understanding the branching criterion or the mechanism governing the bifurcation of a crack in welded joints is still a challenge. In this work, three kinds of crack-branching models that reflect simplified welded joints were designed, and the aim of the present paper is to find and capture the crack-branching behavior in welded joints and to shed light on its branching mechanism. The results show that as long as there is another large enough propagation trend that is different from the original crack propagation direction, then 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. 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, which propagates 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. |
| Databáze: | OpenAIRE |
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