Abstract
The aim of this work is to investigate the low-cycle fatigue (LCF) crack growth behavior of EH-36 steel from the perspective of crack opening displacement, proposing a simple method to calculate the crack growth rate. The crack tip opening displacement (CTOD) under cyclic loads is described by a theoretical formula that takes accumulative strain and crack closure into account. And, a series of quantitative load tests on LCF crack growth of EH-36 steel are carried out to investigate the variation of accumulative strain, crack opening displacement and crack growth life. Through fitting and verification analysis with the test data, the relationship between the crack opening displacement and crack growth rate is obtained. The findings show that the proposed calculate formula can effectively characterize and predict the crack growth behavior of EH-36 steel under the low-cycle fatigue regimes.
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