| Autor: |
Lingzhen Li, Tao Chen, Ningxi Zhang |
| Rok vydání: |
2019 |
| Předmět: |
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| Zdroj: |
Engineering Structures. 185:194-202 |
| ISSN: |
0141-0296 |
| DOI: |
10.1016/j.engstruct.2019.01.128 |
| Popis: |
Previous experimental and numerical studies on central inclined cracked steel plates demonstrated that when the initial crack inclination angles range from 0° to 60°, fatigue lives are similar if the initial crack projection lengths on the direction perpendicular to the loading direction are the same. This is applicable to both unrepaired and repaired specimens. This numerical study extended the inclination angle range from 60° to 80° and was conducted on the stress intensity factor (SIF) and fatigue life of CFRP–repaired steel plates with inclined central cracks subjected to tensile fatigue loading. In the case of unrepaired specimens with a crack inclination angle of 0–70° and double-sided repaired specimens with a crack inclination angle of 0–60°, it was concluded that the crack projection length on the direction perpendicular to the loading axis is the main influence of fatigue life, even though the projection length is calculated from the crack length and inclination angle. Beyond these limits, there is an obvious increase of fatigue life as the crack inclination angle rises. To minimize the effect of mode II component of SIF on the crack tip, two tail slots perpendicular to the loading axis were induced in the front of the inclined crack tips. The tail slots caused the effective SIF to increase and this led to a reduction of fatigue life. However, the limits of the initial crack angle of fatigue life calculation did not change. The results of previous research were also compared to the findings of this study; they supported the conclusions to some extent. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect