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首页> 外文会议>International Conference on Very High Cycle Fatigue >FRACTURE MECHANICS CONSIDERATION OF INTERIOR FRACTURE ORIGIN WITHOUT INCLUSION UNDER ROTATING BENDING IN VERY HIGH CYCLE FATIGUE
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FRACTURE MECHANICS CONSIDERATION OF INTERIOR FRACTURE ORIGIN WITHOUT INCLUSION UNDER ROTATING BENDING IN VERY HIGH CYCLE FATIGUE

机译：骨折机械考虑内部骨折原点而不包含在非常高的循环疲劳中旋转弯曲下的旋转弯曲

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In this study, the fatigue property in very high cycle regime for hydrogen-charged specimens of high carbon chromium steel was examined under rotating bending. In the relatively low cycle regime of A/<106, all specimens have failed in the inclusion induced fracture mode. On the other hand, in the regime of A/>106, the fine granular area, FGA, was observed around the inclusion on the fracture surface in some specimens. Furthermore, a certain inclined surface without inclusion was also frequently found at the crack initiation site on the fracture surface. From the three dimensional geometry of the inclined area at the crack initiation site, the inclined area without inclusion are suggested to be formed based on the crystal triple point, CTP, for packet boundaries of martensite in a grain. Fracture mechanics considerations were carried out on these characteristic fracture origin. The stress intensity factor range was calculated by using Murakami's √area model. The stress intensity factor range at the FGA front, ΔK_(FGA), was within a range from 3.6 to 4.7 MPa√m, whereas the stress intensity factor range at edge of the CTP area, ΔK_(ctp), was from 2.8 to 3.7 MPaVm. In the above calculations, the projected area of the CTP was accepted as the area of √area model. In addition, the local stress at the CTP area is resolved into parallel and perpendicular stress components with respect to the inclined surface. The stress intensity factor range for each stress component was calculated, and both stress intensity factor ranges were combined with energy release rate model. Based on this procedure, the stress intensity factor range at edge of the CTP area was in good agreement with the corresponding value of FGA.
机译：在该研究中，在旋转弯曲下检查了高碳铬钢的氢带标本的非常高循环状态下的疲劳性能。在A / <106的相对较低的循环状态下，所有标本在包含诱导的断裂模式下失效。另一方面，在A /> 106的制度中，在一些标本中围绕裂缝表面观察到细粒面积FGA。此外，在裂缝表面上的裂纹引发位点也经常发现不包含夹杂物的某种倾斜表面。从裂缝起始位点处的倾斜区域的三维几何形状，建议基于晶粒中马氏体的分组边界的晶体三重点形成倾斜区域而没有包含的倾斜区域。在这些特征性骨折起源进行骨折力学考虑。通过使用Murakami的▍Area模型来计算应力强度因子范围。 FGA前部ΔK_（FGA）的应力强度因子范围在3.6至4.7mpa√的范围内，而CTP区域边缘的应力强度因子范围为ΔK_（CTP）为2.8至3.7 MPAVM。在上述计算中，CTP的投影区域被接受为√eA模型的区域。另外，CTP区域的局部应力相对于倾斜表面分离成平行和垂直的应力分量。计算每个应力分量的应力强度因子范围，并且应力强度因子范围与能量释放率模型组合。基于此过程，CTP区域边缘处的应力强度因子范围与FGA的相应值吻合良好。

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