The influence of gaseous environment and fatigue frequency on the growth of fatigue cracks in some aluminum alloys
The influence of gaseous environment and fatigue frequency on the growth of fatigue cracks in some aluminum alloys
复制标题
气体环境和疲劳频率对某些铝合金疲劳裂纹扩展的影响
DOI：
10.1007/bf00190956
复制
发表时间：
1969
期刊：
影响因子：
--
通讯作者：
C. Wheeler
中科院分区：
文献类型：
--
作者：
F. Bradshaw;C. Wheeler
在某些气体环境中，在100，1和1/60 Hz的疲劳频率下的裂纹扩展的测量结果表明，裂纹速率随频率的变化可以部分或全部归因于环境，这取决于合金。研究了氧气、水蒸气和水蒸气在氧气和氮气存在下的作用。影响裂纹扩展所必需的临界气体压力取决于频率和裂纹速率。所观察到的效果的机制进行了讨论，并解释在裂纹尖端的气体吸附和裂纹上的吸附表面层的直接行动，而它正在增长的结果。
Measurements of crack growth at fatigue frequencies of 100, 1 and 1/60 Hz in some gaseous environments show that changes of crack rate with frequency can be partly or entirely due to environment, depending on the alloy. The effects of oxygen, water vapor alone and water vapor in the presence of oxygen and nitrogen have been studied. The critical gas pressures which are necessary to affect crack growth depend on frequency and crack rate. Mechanisms for the effects observed are discussed and results are interpreted in terms of gas adsorption at the crack tip and the immediate action of adsorbed surface layers on the crack while it is growing.