基于衰减路径时变性的压力容器疲劳裂纹安全裕度研究
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O346.1

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国家自然科学基金(5187051962); 四川省自然科学基金(2019YFG0347)


Research on safety margin of fatigue crack of pressure vessel based on time variation of attenuation path
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    摘要:

    传统压力容器安全裕度表征模型未考虑裂纹扩展过程中的时变性,导致无法准确反映剩余安全裕度大小. 为此,本文基于速度积概念建立了大型压力容器剩余安全裕度模型. 裂纹扩展形式直接影响安全裕度判定,故运用Paris公式并考虑闭合效应得到裂纹扩展规律公式,并结合Newman和Raju数值计算应力强度因子的理论,得到了不同裂纹的深度和长度方向变化的关联函数. 以表面裂纹为例,通过关联函数模型得到安全衰减路径,然后计算了路径速度积安全裕度模型的表征变化,从寿命安全裕度角度评价了路径速度积安全裕度模型,结果表明,随着裂纹在不同速度下的扩展变化,其安全评价结果更符合实际安全裕度变化,并为工程应用提供新思路.

    Abstract:

    The traditional pressure vessel safety margin characterization model does not consider the time-varying nature of the crack propagation process, which makes it impossible to accurately reflect the residual safety margin. This paper establishes a large pressure vessel residual safety margin model based on the velocity product concept. The form of crack growth directly affects the determination of safety margin, so the Paris formula is used to obtain the crack growth law formula with the closure effect, and the theory of Newman and Raju numerical calculation of the stress intensity factor is used to obtain the correlation function of the changes in the depth and length of different cracks. Taking surface cracks as an example, the safety attenuation path is obtained based on the correlation function model, then the characterization change of the path velocity product safety margin model is calculated, and the path velocity product safety margin model is evaluated from the perspective of life safety margin. It is shown that as the crack propagation changes at different speeds, the safety evaluation results are more consistent with the actual safety margin changes, and provides new ideas for engineering applications.

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引用本文格式: 谢阳,赵波,龙伟,刘华国,李炎炎. 基于衰减路径时变性的压力容器疲劳裂纹安全裕度研究[J]. 四川大学学报: 自然科学版, 2021, 58: 064003.

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历史
  • 收稿日期:2021-04-15
  • 最后修改日期:2021-06-03
  • 录用日期:2021-06-07
  • 在线发布日期: 2021-11-25
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