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首页> 外文期刊>Materials Science and Engineering >Effect of loading type on fatigue properties of high strength bearing steel in very high cycle regime
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Effect of loading type on fatigue properties of high strength bearing steel in very high cycle regime

机译：加载类型对高强度轴承钢在高循环状态下疲劳性能的影响

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摘要

Very high cycle fatigue tests under axial loading at frequencies of 95 Hz and 20 kHz were performed to clarify the effect of loading type on fatigue properties of a high strength bearing steel in combination with experimental result of this steel under rotating bending. As a result, this steel represents the single P-S-N (probabilistic-stress-life) curve characteristics for surface-induced fracture and interior inclusion-induced fracture, just like that under rotating bending. However, fatigue strength is lower, where the run-out stress at 10~9 cycles is evaluated to be 588 MPa, less than that under rotating bending with about 858 MPa. Occurrence probability of larger and deeper inclusion-induced fracture is much higher than that under rotating bending. Furthermore, the formation process of fine granular area (FGA) is independent of the type and frequency of loading, which is very slow and is explained as the crack nucleation process under the special dislocation mechanism. The stress intensity factor range at the front of FGA, △K_(FGA), is approximately regarded as the threshold value controlling the stable propagation of interior crack. For the control volume of specimen under axial loading, the estimated value of fatigue limit by FGA is similar to experimental run-out stress value at 10~9 cycles, but that by inclusion is larger. However, the corresponding estimated results under rotating bending are all conservative.
机译：结合轴向弯曲试验的结果，进行了轴向载荷在95 Hz和20 kHz频率下的超高循环疲劳试验，以阐明载荷类型对高强度轴承钢疲劳性能的影响。结果，这种钢代表了表面诱导的断裂和内部夹杂物引起的断裂的单一P-S-N（概率-应力-寿命）曲线特征，就像在旋转弯曲下一样。然而，疲劳强度较低，在10〜9个循环时的跳动应力估计为588 MPa，比旋转弯曲时的858 MPa小。更大和更深的夹杂物引起的断裂的发生几率远高于旋转弯曲时。此外，细颗粒区域（FGA）的形成过程与加载的类型和频率无关，这非常慢，并被解释为在特殊位错机制下的裂纹成核过程。 FGA前端的应力强度因子范围△K_（FGA）大约被视为控制内部裂纹稳定扩展的阈值。对于在轴向载荷下控制的试样体积，FGA的疲劳极限估计值与10〜9个循环的实验跳动应力值相似，但包含量更大。但是，旋转弯曲下的相应估计结果都是保守的。

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  • 来源
    《Materials Science and Engineering》 |2011年第15期|p.5044-5052|共9页
  • 作者

    W. Li; T. Sakai; Q Li; LT. Lu; P. Wang;

  • 作者单位

    College of Science and Engineering, Ritsumeikan University, Kusatsu, 525-8577, Japan;

    College of Science and Engineering, Ritsumeikan University, Kusatsu, 525-8577, Japan;

    School of Mechanical and Electronic Engineering, Beijing Jiaotong University, Beijing, 100044, China;

    State Key laboratory of Traction Power, Southwest Jiaotong University, Chengdu, 610031, China;

    Institute of Oceanographic Instrumentation, Shandong Academy of Sciences, Qingdao, 266001, China;

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  • 正文语种 eng
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  • 关键词

    very high cycle fatigue; loading type; bearing steel; interior crack initiation; fatigue limit;

    机译：极高的循环疲劳;加载类型;轴承钢;内部裂纹萌生;疲劳极限;

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