?The Applicability of the Manson-Coffin Law and Miner's Law to Extremely Low Cycle Fatigue
?The Applicability of the Manson-Coffin Law and Miner's Law to Extremely Low Cycle Fatigue
复制标题
DOI：
10.1299/kikaia.53.1178
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
K. Shimada;J. Komotori;M. Shimizu
中科院分区：
文献类型：
--
作者：
K. Shimada;J. Komotori;M. Shimizu
退火低碳钢在极低周疲劳状态下的疲劳寿命特征受到了人们的关注。在这种情况下，随着塑性应变范围的增加，断裂模式从表面裂纹转变为内部裂纹。结果表明，在该状态下，最终断裂发生的应变循环次数少于曼森-柯芬定律对于普通低周疲劳状态的预期，其中小表面裂纹的发展导致样本断裂。这种疲劳寿命的降低是由于材料内部珠光体在高塑性应变范围内开裂造成的。还讨论了米纳定律在极低周疲劳状态下可变塑性应变幅下疲劳寿命预测的适用性。
Attention has been focussed on the characteristics of the fatigue life of annealed low carbon steel in the extremely low cycle fatigue regime. In this regime, a transition of the fracture mode occurs from the surface to internal cracking with an increase in the plastic strain range. Results show that in this regime the final fracture occurs at a strain cycle count less than that expected from the Manson-Coffin law for an ordinary low cycle fatigue regime in which the development of small surface cracks leads to the fracture of the specimen. Such a reduction in fatigue life is caused by the cracking of pearlite inside the material at a high plastic strain range. The applicability of Miner's law to the prediction of the fatigue life under a variable plastic strain amplitude in the extremely low cycle fatigue regime has also been discussed.