Composite probability distribution for fatigue life prediction of API X65 steel via Vickers hardness

IF 4 2区 工程技术 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Haotian Sun, Diqing Fan, Xintian Liu, Jiazhi Liu, Haiyan Ge
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引用次数: 0

Abstract

Accurate prediction of the fatigue life of API X65 steel is crucial in various applications. However, the traditional bootstrap method has inherent limitations, such as a tendency to deviate from the true distribution with insufficient sample sizes, difficulty in identifying extreme statistics, and an inability to generate distributions closer to the original sample. These deficiencies lead to overly conservative S-N curve designs and pose challenges in data collection, particularly for small samples. To address these issues, we propose an improved bootstrap method using a composite probability distribution. This method enhances the sampling range and improves prediction accuracy for parameter uncertainty ranges by considering both small samples and extended virtual samples’ probability distribution. Comparative analysis through Monte Carlo simulation demonstrates the superior parameter estimation of our method for small samples. Our case analysis further explores the relationships between Vickers hardness, tensile strength, surface roughness factor, and intercept constant. The findings led to a novel method for estimating the S-N curve confidence interval of API X65 steel from Vickers hardness. Analysis of fatigue life test data for API X65 steel yielded favorable results, confirming the effectiveness and feasibility of our improved method.
用维氏硬度预测API X65钢疲劳寿命的复合概率分布
准确预测API X65钢的疲劳寿命在各种应用中是至关重要的。然而,传统的自举方法有其固有的局限性,例如在样本量不足的情况下容易偏离真实分布,难以识别极端统计量,无法生成更接近原始样本的分布。这些缺陷导致S-N曲线设计过于保守,并对数据收集构成挑战,特别是对于小样本。为了解决这些问题,我们提出了一种改进的使用复合概率分布的自举方法。该方法同时考虑了小样本和扩展虚拟样本的概率分布,扩大了采样范围,提高了参数不确定性范围的预测精度。通过蒙特卡罗仿真对比分析,证明了该方法在小样本情况下具有较好的参数估计效果。我们的案例分析进一步探讨了维氏硬度、抗拉强度、表面粗糙度系数和截距常数之间的关系。研究结果提出了一种利用维氏硬度估算API X65钢S-N曲线置信区间的新方法。通过对API X65钢疲劳寿命试验数据的分析,得到了良好的结果,证实了改进方法的有效性和可行性。
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来源期刊
International Journal of Damage Mechanics
International Journal of Damage Mechanics 工程技术-材料科学:综合
CiteScore
8.70
自引率
26.20%
发文量
48
审稿时长
5.4 months
期刊介绍: Featuring original, peer-reviewed papers by leading specialists from around the world, the International Journal of Damage Mechanics covers new developments in the science and engineering of fracture and damage mechanics. Devoted to the prompt publication of original papers reporting the results of experimental or theoretical work on any aspect of research in the mechanics of fracture and damage assessment, the journal provides an effective mechanism to disseminate information not only within the research community but also between the reseach laboratory and industrial design department. The journal also promotes and contributes to development of the concept of damage mechanics. This journal is a member of the Committee on Publication Ethics (COPE).
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