Surface topography and the impact on fatigue performance
Surface topography and the impact on fatigue performance
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DOI：
10.1088/2051-672x/3/1/015007
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发表时间：
2015-01-01
影响因子：
2.7
通讯作者：
Bache, M. R.
中科院分区：
文献类型：
--
作者：
Ardi, D. T.;Li, Y. G.;Bache, M. R.
将真实的表征应用于由镍基高温合金合金720 Li制成的普通疲劳试样，以确定机加工/精加工表面形貌对该材料疲劳性能的影响。在车削和喷丸条件下对样品进行疲劳试验，以研究残余应力和形貌之间的相互作用对疲劳性能的影响。车削过程被故意操纵，以产生三种不同的光洁度，随后进行相同的喷丸处理，从而产生六个等级的表面形貌。表面形貌被发现影响疲劳，即使在存在喷丸压缩残余应力，促进裂纹萌生在山谷网站。表面的粗糙度幅度和空间特性被认为是重要的疲劳性能相关时。
A real characterization was applied to plain fatigue specimens manufactured from a nickel-based superalloy, Alloy 720Li, to determine the impact of machined/finished surface topography on fatigue performance of this material. Samples were subjected to fatigue testing in the as-turned and shot peened conditions to study the interaction between residual stresses and topography in influencing the fatigue performance. The turning process was deliberately manipulated to produce three distinct finishes which were subsequently given an identical shot peening, resulting in six grades of surface topography. Surface topography was found to influence fatigue even in the presence of peened compressive residual stresses by promoting crack initiation at valley sites. Both the roughness amplitude and spatial characteristics of the surface were found to be important when correlating to fatigue performance.