疲劳裂纹扩展速率试验中裂纹曲率修正方法研究

高宇昊, 王佳, 吴泽鹏, 陈沛, 翟建飞

高宇昊, 王佳, 吴泽鹏, 陈沛, 翟建飞. 疲劳裂纹扩展速率试验中裂纹曲率修正方法研究[J]. 材料开发与应用, 2023, 38(2): 10-15.
引用本文: 高宇昊, 王佳, 吴泽鹏, 陈沛, 翟建飞. 疲劳裂纹扩展速率试验中裂纹曲率修正方法研究[J]. 材料开发与应用, 2023, 38(2): 10-15.
GAO Yuhao, WANG Jia, WU Zepeng, CHEN Pei, ZHAI Jianfei. Study on Crack Curvature Correction Method in Fatigue Crack Growth Rate Test[J]. Development and Application of Materials, 2023, 38(2): 10-15.
Citation: GAO Yuhao, WANG Jia, WU Zepeng, CHEN Pei, ZHAI Jianfei. Study on Crack Curvature Correction Method in Fatigue Crack Growth Rate Test[J]. Development and Application of Materials, 2023, 38(2): 10-15.

疲劳裂纹扩展速率试验中裂纹曲率修正方法研究

详细信息
    作者简介:

    高宇昊,男,1989年生,硕士,从事材料疲劳与断裂测试技术研究工作。E-mail:qiye2017@163.com

  • 中图分类号: TG115.5

Study on Crack Curvature Correction Method in Fatigue Crack Growth Rate Test

  • 摘要: 针对目前疲劳裂纹扩展速率试验标准中仅提出裂纹长度需进行曲率修正但未给出具体修正方法及步骤的问题,作者推荐了线性插值法和等比例法两种裂纹曲率修正方法,并通过分析两种方法的修正原理,结合试验结果,将两种曲率修正方法进行对比。结果表明,在双对数坐标系上,修正后的da/dNK曲线向低ΔK方向偏移,最大偏移量约15%,在利用da/dNK曲线进行选材对比或疲劳寿命评估时,修正后的曲线与未修正的曲线相比是偏安全的。基于两种方法修正后的da/dN-ΔK曲线之间差异较小,最大相差约2%,两种方法均可作为疲劳裂纹扩展速率试验中裂纹长度的曲率修正方法。
    Abstract: The fatigue crack length should be modified based on crack curvature correction according to the fatigue crack growth rate test standard. However, the specific correction method and calculation procedures are not given. Thus, two crack curvature correction methods are recommended in the paper, i.e. linear interpolation method and equal proportion method. The two curvature correction methods are compared by analyzing their correction principles combining with the experimental results. The results indicate that the modified da/dNK curve has an offset up to 15% toward to the low ΔK direction in the log-log coordinates system. When using da/dNK curve to conduct material selection and fatigue life evaluation, the modified da/dNK curve is safer than the unmodified. The difference between the da/dNK curves corrected by the two methods is not significant, and the maximum difference is about 2%.Both methods can be used as the curvature correction method in the fatigue crack growth rate test.
  • [1] GB/T 6398-2017,金属材料疲劳试验疲劳裂纹扩展方法[S].
    [2]

    ASTM E647-15e1,Standard Test Method for Measurement of Fatigue Crack Growth Rates[S].

    [3] 张立新,蒋东霖,马伟.断裂力学试验后裂纹长度曲率修正的实现[J].工程与试验,2016,56:83-85.
    [4] 高宇昊,陈沛,刘晓勇,等.一种基于曲率修正原理的裂纹长度测算方法.中国专利:113237745A, 2021-8-10.
  • 期刊类型引用(1)

    1. 高宇昊,王佳,朱官朋,房坤,翟建飞. 柔度法测算三点弯曲试样疲劳裂纹长度的影响因素. 理化检验-物理分册. 2024(03): 4-9+15 . 百度学术

    其他类型引用(0)

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出版历程
  • 收稿日期:  2022-07-06
  • 网络出版日期:  2023-05-05

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