CRACK PROPAGATION MODELING FOR SURFACE GENERATED SCRATCHES IN Al 2024-T3 CLAD ALLOY
CRACK PROPAGATION MODELING FOR SURFACE GENERATED SCRATCHES IN Al 2024-T3 CLAD ALLOY
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Al 2024-T3 复合合金表面产生的划痕的裂纹扩展模型
DOI：
10.1515/jmbm.1997.8.2.117
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发表时间：
1997
影响因子：
1.8
通讯作者：
J. Talia
中科院分区：
文献类型：
--
作者：
M. Talia;J. Talia
The effects of surface generated scratches on fatigue life and fatigue crack growth rate in Al 2024-T3 clad alloy is reported. Significant drops in fatigue life of up to 95% were observedfor 100 micron scratch depth in 0.4 inches (1.016 mm) thick specimens, which suggests that this alloy is a scratch-sensitive material. In addition, it was observed that fatigue crack growth rates are significantly higher in scratched specimens than in the unscratched specimens. Based on data analysis, Paris equation type models have been developed that predict the fatigue crack propagation behavior in scratched specimens for both long and short cracks. Scanning Electron Microscope observations reveal that scratches generate micro fissures. The micro fissures aided by the fatigue process coalesce to form larger concentration of micro cracks (whose performance resembles short crack behavior) in front of the path of cracks. It is conjectured that this correlation can be linked to the reduction in fatigue life and to the increase in fatigue crack growth rates of the alloy.
