Fatigue crack growth in a diverse range of materials

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• 作者：R. Jones^a ; ^b ; L. Molent^c ; ^{lorrie.molent@defence.gov.au} ; K. Walker^c
• 关键词：Fatigue ; Fatigue threshold ; Crack growth ; Short and long crack growth ; Hartman and Schijve equation
• 刊名：International Journal of Fatigue
• 出版年：2012
• 期刊代码：79_01421123
• 类别：et
• 出版时间：July, 2012
• 卷：40
• 期：Complete
• 页码：43-50
• 文件大小：671 K

摘要

This paper generally examines long crack growth data for a range of aerospace and rail materials tested at a variety of R ratios. The results of this study revealed that, for the 22 materials studied, the crack growth rate, da/dN, could be represented by a variant of the Hartman and Schijve equation with da/dN being proportional to the quantity where 伪 is approximately two. For cracking in 7050-T7451 it was also shown that this formulation holds for both long and small cracks, although a different value of 螖K_th was required for small cracks compared to that required for long cracks. A possible explanation for this discrepancy is proposed and a methodology to estimate the small crack behaviour based on long crack data is presented. As such these observations have the potential to simplify the prediction of fatigue crack growth lives.