DH36 steel is a widely used material in marine engineering. The fatigue crack propagation rates of DH36 steel at low temperatures have 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 behaviour of DH36 steel at low temperatures (−60°C to 20°C) by carrying out tensile tests and fatigue crack propagation tests of DH36 steel, in order to obtain the fatigue crack propagation behaviour of DH36 steel. The influence of the elastic modulus on the crack length measured by the compliance method is considered. On the basis of 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.

中文翻译：

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DH36钢疲劳裂纹扩展的温度依赖性。

DH36钢是海洋工程中广泛使用的材料。DH36钢在低温下的疲劳裂纹扩展速率对在极性环境下工作的结构的疲劳强度具有至关重要的影响。本文的目的是通过进行DH36钢的拉伸试验和疲劳裂纹扩展测试来研究DH36钢在低温（−60°C至20°C）下的疲劳裂纹扩展行为，从而获得疲劳裂纹。 DH36钢的扩散行为。考虑弹性模量对通过柔度法测量的裂纹长度的影响。根据巴黎定律，研究了不同温度下的裂纹扩展速率。