High‐temperature fatigue crack growth in Inconel 718 subjected to high strain amplitudes
High‐temperature fatigue crack growth in Inconel 718 subjected to high strain amplitudes
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高应变幅下 Inconel 718 的高温疲劳裂纹扩展
DOI：
10.1111/j.1460-2695.2006.01041.x
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Melin
中科院分区：
文献类型：
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作者：
M. Andersson;C. Persson;S. Melin
在Inconel 718中进行了650 ℃高应变幅下的疲劳裂纹扩展实验。研究了载荷幅值、载荷比和频率等因素的影响。结果发现，裂纹扩展是一个混合物的循环和时间依赖的机制，取决于负载频率。载荷频率对裂纹扩展速率也有很大的影响。此外，裂纹闭合被发现发挥了重要作用。通过使用一个有效的F-积分，并包括一个频率补偿项，它是可能的总结成经验寿命预测法，这似乎是在合理的协议与其他研究的数据裂纹扩展数据。
Fatigue crack growth experiments in Inconel 718 subjected to high strain amplitudes at 650 degrees C have been conducted. In the study the effects of load amplitude, ratio and frequency have been investigated. It was found that crack growth is a mixture of cyclic and time dependent mechanisms, depending on the load frequency. The load frequency was also found to have a strong influence on the crack growth rate. Also, crack closure was found to play an important role. By using an effective F-integral and including a frequency compensation term it was possible to summarize crack growth data into an empirical life prediction law, which seems to be in reasonable agreement with data from other studies.