Notch-Root-Radius Effect on Propagation of Short Fatigue Cracks in Notched Specimens of Low-Carbon Steel : Series A : Solid-Mechanics, Strength of Materials
Notch-Root-Radius Effect on Propagation of Short Fatigue Cracks in Notched Specimens of Low-Carbon Steel : Series A : Solid-Mechanics, Strength of Materials
复制标题
缺口根半径对低碳钢缺口试样中短疲劳裂纹扩展的影响：A 系列：固体力学，材料强度
DOI：
10.1299/kikaia.53.393
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Keisuke Tanaka
中科院分区：
文献类型：
--
作者：
Y. Akiniwa;Keisuke Tanaka
本文用低碳钢板研究了缺口根部疲劳短裂纹的扩展行为。通过柔度法测量了裂纹闭合随裂纹扩展的发展。虽然短裂纹的扩展速率比长裂纹的速率-ΔK关系所预测的要高，但它与有效应力强度范围有唯一的关系，而长裂纹的关系也是一样的。随着裂纹长度的增加，Kop的增加是独立的缺口根部半径。当非扩展裂纹为部分穿透短裂纹时，其长度受缺口根部半径的影响。随着非扩展裂纹长度的增加，门槛应力强度范围增大，有效张开分数减小。有效应力强度范围的阈值与裂纹长度无关，取一恒定值。
The propagation behavior of short fatigue cracks formed at a notch root was studied by using low-carbon steel plates with center notches of various tip radii. The development of crack closure with crack growth was measured through the compliance method. Although the growth rate of short cracks was higher than that predicted from the rate-ΔK relation for long cracks, it was uniquely related to the effective stress intensity range and the relation was identical for long cracks. The increase in Kop with increasing crack length was independent of the notch root radius. The length of a non-propagating crack was affected by the notch root radius when it was a short, part-through crack. As the length of a non-propagating crack became longer, the threshold stress intensity range increased and the effective opening fraction decreased. The threshold value of the effective stress intensity range took a constant value irrespective of the crack length.