Environmentally induced crack (EIC) initiation, propagation, and failure: A 3D in-situ time-lapse study of AA5083 H131
Environmentally induced crack (EIC) initiation, propagation, and failure: A 3D in-situ time-lapse study of AA5083 H131
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DOI：
10.1016/j.corsci.2020.108834
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发表时间：
2020-06
影响因子：
8.3
通讯作者：
V. Gudla;M. Storm;Benjamin C. Palmer;John J. Lewandowski;P. J. Withers;N. Holroyd;Timothy L. Burnett
中科院分区：
文献类型：
--
作者：
V. Gudla;M. Storm;Benjamin C. Palmer;John J. Lewandowski;P. J. Withers;N. Holroyd;Timothy L. Burnett
利用同步辐射X射线CT对AA5083 H131合金的环境诱发裂纹(EIC)进行了高时空分辨率的三维观察。裂纹萌生于∼为0.5σy的潮湿空气中，从与金属间化合物粒子簇有关的腐蚀部位开始萌生。裂纹扩展的时间分辨监测证实，裂纹在门槛KIEIC以下扩展，在固定的位移条件下很容易止裂。即使当裂纹超过阈值KIEIC并进入持续扩展时，它们的扩展速度也非常不均匀。当最大裂纹的K超过断裂韧度KIc时，发生破坏。
Environment Induced Cracking (EIC) has been observed in three dimensions (3D) at high spatial and temporal resolution for AA5083 H131 alloy using in situ synchrotron X-ray CT. The initiation of EIC cracks occurred in humid air at ∼0.5σyand started from corrosion sites associated with intermetallic particle clusters. Time-resolved monitoring of the crack growth confirmed cracks grow below threshold KIEICand are susceptible to arrest under fixed displacement conditions. Even when the cracks exceed threshold KIEICand enter sustained propagation they exhibit very uneven growth rates. Failure occurs when the K of the largest crack exceeds the fracture toughness KIC.