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首页> 外文会议>AMD-vol.256; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >FATIGUE STRENGTH EVALUATION OF DEFECTS EMBEDDED IN LARGE-SIZED STUD BOLT OF MARINE ENGINE
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FATIGUE STRENGTH EVALUATION OF DEFECTS EMBEDDED IN LARGE-SIZED STUD BOLT OF MARINE ENGINE

机译：海洋发动机大尺寸螺栓内嵌缺陷的疲劳强度评估

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摘要

Millimeter-sized defects are often found during inspection near the centerline of the shank of large-sized stud bolts. Determination of allowable defect size is practically required in view of safety. An experimental investigation on the fatigue strength of the stud bolt has been carried out in order to evaluate the effect of defects embedded in the stud bolt on the fatigue strength. Fatigue testing was conducted for stress ratios of 0.0, 0.4 and 0.7 using plain specimens and defected specimens having a defect embedded inside to examine the fatigue limit according to the stress ratio. Macroscopic and microscopic analyses were also conducted in order to determine initial defect size, crack initiation site and propagation rate from beach marks on the fracture surface. Existing small defect evaluation methods currently available were used for the strength evaluation. Allowable internal defect size was determined based on the high mean and high cycle stress states of the bolt by linear elastic fracture mechanics.
机译：在检查大型双头螺栓的杆中心线附近时，通常会发现毫米大小的缺陷。考虑到安全性，实际上需要确定允许的缺陷尺寸。为了评估埋在双头螺栓中的缺陷对疲劳强度的影响，已经对双头螺栓的疲劳强度进行了实验研究。使用普通试样和内部埋有缺陷的缺陷试样对0.0、0.4和0.7的应力比进行疲劳测试，以根据应力比检查疲劳极限。还进行了宏观和微观分析，以确定初始缺陷尺寸，裂纹萌生部位和裂缝表面上海滩痕迹的扩散速率。当前可用的现有小缺陷评估方法用于强度评估。通过线性弹性断裂力学，基于螺栓的高平均应力和高循环应力状态，确定允许的内部缺陷尺寸。

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