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The growth of short fatigue cracks ahead of a notch in high strength steel

机译：短疲劳裂纹的增长先于高强度钢的缺口

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摘要

This paper is concerned with the short crack growth behaviour in notched specimens of high strength steels mainly used for automotive parts. Attention is focused on the appropriate estimation of the stress intensity range DELTA K, when the short cracks grow in the stress field of a notch and attempts are made to investigate whether this is appropriate or whether further allowance may have to be made for short crack effects at low DELTA K. The stress distribution for the notch in bending was taken into account for the estimation of DELTA K. This enabled us to produce a more precise evaluation of short crack growth in the stress field of the notch. Our findings are that the short cracks, which propagate in the notch field, grow faster at low DELTA K when their lengths are extremely short compared with the notch root radius. The short crack effect at low DELTA K in the notch stress field is analysed by expressing the crack growth data in terms of the parameter, DELTA K_S in which stress gradient ahead of the notch is taken into account.
机译：本文涉及主要用于汽车零件的高强度钢的缺口试样中的短裂纹扩展行为。当在缺口的应力场中出现短裂纹时，应集中精力对应力强度范围DELTA K进行适当的估计，并尝试研究这种裂纹是否合适，或者是否需要为短裂纹影响留出更多余地在DELTA K的估算中考虑了弯曲处缺口的应力分布。这使我们能够对缺口应力场中的短裂纹扩展进行更精确的评估。我们的发现是，在缺口场中传播的短裂纹，当其长度与缺口根部半径相比极短时，在低DELTA K下增长更快。通过用参数DELTA K_S表示裂纹扩展数据，分析了缺口应力场中低DELTA K时的短裂纹效应，其中考虑了缺口前的应力梯度。

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