Temperature-dependent characteristics of DH36 steel fatigue crack propagation
Peer reviewed, Journal article
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Original versionFatigue & Fracture of Engineering Materials & Structures. 2020, 43 (3), 617-627. 10.1111/ffe.13177
DH36 steel is a widely used material in marine engineering. The fatigue crack propagation rates of DH36 steel at low temperatures has a crucial influence on the fatigue strength of structures operating in polar environments. The objective of this paper is to investigate the fatigue crack propagation behavior of DH36 steel at low temperatures (-60℃~20℃) by carrying out tensile tests and fatigue crack propagation tests of DH36 steel, in order to obtain the fatigue crack propagation behavior of DH36 steel. The influence of the elastic modulus on the crack length measured by the compliance method is considered. Based on the Paris law, the crack propagation rate at different temperatures is investigated. The results and the observed failure modes indicated that Fatigue Ductile to Brittle Transition (FDBT) occurred as the temperature was lowered.