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首页> 外文会议>Proceeding of An International Conference the Importance of understanding the fundamentals of the fatigue Process in Counteracting Its Effects in Engineering Components and Structures,and to Reflect on the Contributions of K.J.Miller Sheffield/United >A comparison of corner notched and compact tension specimens for high temperature fatigue testing
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A comparison of corner notched and compact tension specimens for high temperature fatigue testing

机译：高温疲劳试验中角切口和紧凑拉伸试样的比较

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摘要

Fatigue crack growth behaviour at elevated temperature in Waspaloy has been in-vestigated using corner notched (CN) and compact tension (CT) specimens.Emphasis has been placed on crack growth pattern and crack front shape as well as crack growth rate,and comparisons have been made accordingly between the two different test geometries.A phenomenon of crack front tunnelling has been observed in both specimens tested under predominantly sustained load at front tunnelling has been observed in both specimens tested under predominantly sustained load at elevated temperature.The degree of crack gunnelling has been found to depend on specimen geometry and loading mode as well as temperature,with the most significant tunnelling occurring in corner notched specimens tested under static load at 700 deg C.Furthermore,fatigue crack growth rate in Cn speimens has been found to be slower compared to that in CT speimens,especially at high stress intensities and high temperatures,Mechanical and environmental aspects are discussed with respect to the crack growth patterns and the associated failure mechanisms.
机译：使用角缺口（CN）和紧密拉伸（CT）样品研究了Waspaloy在高温下的疲劳裂纹扩展行为，重点研究了裂纹扩展模式，裂纹前部形状以及裂纹扩展速率，并进行了比较在两个不同的测试几何形状之间相应地进行了测试。在高温下主要在持续载荷下测试的两个样品中都观察到了在主要承受持续载荷的情况下在前隧道中观察到的裂纹前沿隧穿现象。已发现其取决于样品的几何形状和加载方式以及温度，其中最明显的隧道现象发生在在700摄氏度的静载荷下测试的角形切口样品中。此外，发现Cn试件的疲劳裂纹扩展速度较慢与CT样品相比，特别是在高应力强度和高温下，机械和环境讨论了有关裂纹扩展方式和相关失效机制的心理方面。

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