Statistical Analysis Methods of Fatigue Crack Growth Rate

• Published in: Transactions of Tianjin University Vol. 20; no. 5; pp. 322 - 327
• Main Author: 张啸尘 谢里阳 刘建中 张宇 佟安时 马园园
• Format: Journal Article
• Language: English
• Published: Heidelberg Tianjin University 01.10.2014; School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China%Beijing Institute of Aeronautical Materials, Beijing 100095, China
• Subjects: Engineering; Humanities and Social Sciences; Mechanical Engineering; multidisciplinary; Science; 中心裂纹; 因子分析; 拉伸试样; 拟合曲线; 概率分布; 疲劳裂纹扩展寿命; 疲劳裂纹扩展速率; 统计分析方法; curve fitting; probabilistic fatigue crack growth rate; d; Δ; confidence; reliability; p-da/dN-△K curve fitting
• ISSN: 1006-4982; 1995-8196
• DOI: 10.1007/s12209-014-2131-z

The standard center-cracked tensile specimens M （T） with different widths made of aluminum alloy were designed for fatigue crack growth rate experiments, and the effect of specimen size on the fatigue crack growth rate was discussed. The firing equation and the p-da/dN-△K curve of fatigue crack growth rate （with different confidence and reliability levels） were obtained by one-side tolerance factor analysis. In order to reasonably reflect the dispersion of material properties on the fatigue crack growth rate and fatigue crack propagation life, two novel statistical analysis methods were proposed, which can be used to describe the probability distribution of fatigue crack growth rate. Compared with the traditional statistical analysis method of probabilistic fatigue crack growth rate, the fitted curves from the novel statistical analysis methods yield more objective description on the probability distribution of crack growth rate.