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http://dx.doi.org/10.1016/j.ijnaoe.2018.09.003

Low cycle fatigue and ratcheting failure behavior of AH32 steel under uniaxial cyclic loading  

Dong, Qin (Key Laboratory of High Performance Ship Technology(Wuhan University of Technology), Ministry of Education)
Yang, Ping (Key Laboratory of High Performance Ship Technology(Wuhan University of Technology), Ministry of Education)
Xu, Geng (School of Transportation, Wuhan University of Technology)
Publication Information
International Journal of Naval Architecture and Ocean Engineering / v.11, no.2, 2019 , pp. 671-678 More about this Journal
Abstract
In this paper, the low cycle fatigue failure and ratcheting behavior, as well as their interaction of AH32 steel were experimentally investigated under uniaxial cyclic loading. The effects of mean stress, stress amplitude and stress ratio on the low cycle fatigue life and ratcheting strain were discussed. It was found that the ratcheting strain increased while the fatigue life decreased with the increase of mean stress and stress amplitude, and the increasing stress ratio would result in smaller ratcheting and larger fatigue life. Two kinds of failure modes, i.e. low cycle fatigue failure due to crack propagates and ratcheting failure due to large plastic strain will take place respectively. Based on the experimental results, considered the effect of ratcheting on fatigue life, a model with the maximum stress and ratcheting strain rate was proposed. Comparison with the experimental result showed that the new model provided a good prediction for AH32 steel.
Keywords
Low cycle fatigue; Ratcheting; Cyclic loading; AH32 steel;
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