Acceleration effect of a graphite dust environment on the fatigue crack propagation rates of Al alloy
Acceleration effect of a graphite dust environment on the fatigue crack propagation rates of Al alloy
复制标题
石墨粉尘环境对铝合金疲劳裂纹扩展速率的加速作用
DOI：
10.1016/j.ijfatigue.2019.04.033
复制
发表时间：
2019-09-01
影响因子：
6
通讯作者：
Zhou, W.
中科院分区：
文献类型：
--
作者：
Chen, Y. Q.;Zhang, H.;Zhou, W.
研制了一套粉尘环境下铝合金疲劳试验装置，研究了石墨粉尘环境对2524-T3铝合金疲劳裂纹扩展行为的影响。试样在石墨粉尘中的疲劳裂纹扩展速率（FCGR）较高，特别是在低Δ K水平下，并且随着Δ K的增加，趋于与空气中的疲劳裂纹扩展速率相似。石墨粉尘的这种加速效应是由于吸附的石墨颗粒对配合断裂表面的润滑作用，这降低了裂纹闭合的程度并促进了微裂纹的生长。
An experimental set-up for the fatigue testing of Al alloy in dusty environments was developed and the effect of a graphite dust environment on the fatigue crack propagation behaviour of 2524-T3 Al alloy was investigated. The fatigue crack propagation rates (FCGRs) are higher for the sample in graphite dust especially at low Delta K-levels and tends to be similar to those in air with increasing Delta K. This acceleration effect of graphite dust is due to the lubrication of the absorbed graphite particles on the mating fracture surfaces which decreases the extent of crack closure and promotes microcrack growth.