Guo Wenyong, Yu Li, Wu Zhe, Zhang Yue, Cao Chenghao, Zeng Yan, Yu Liangwu, Huang Jianing
College of Power Engineering, Naval University of Engineering, Wuhan 430033, Hubei, P. R. China.
ACS Omega. 2024 Aug 30;9(37):38925-38935. doi: 10.1021/acsomega.4c05289. eCollection 2024 Sep 17.
During polar navigation, adverse environmental conditions like cold temperatures, fatigue, and corrosion can affect surface and underwater manned vehicles (UMVs). Understanding the fatigue fracture growth behavior of polar ship steel is crucial for ensuring safety. This study investigates the mechanical properties and fatigue fracture propagation of steel used in underwater vehicle rudders under various low-temperature conditions through experimental research. It compares and analyzes the static mechanical characteristics, fatigue crack growth rate, and fracture morphology of underwater manned vehicle rudder steels at different low temperatures. Findings show enhancements in yield strength, tensile strength, elastic modulus, and fatigue crack propagation life of steel 925A, steel 20#, and their welded parts under low-temperature conditions. The tensile strength of 925A steel, 20# steel, and their welded parts increases by 6.87%, 14.61%, and 12.55%, respectively, as the temperature decreases from 20 to -60 °C. The yield strength also increases by 14.17%, 29.09%, and 15.76%, respectively. Fatigue crack propagation rate experiments were conducted under different constant low-temperature conditions. This study offers direction for future modeling and experimental testing.
在极地航行期间，诸如低温、疲劳和腐蚀等不利环境条件会影响水面和水下载人航行器（UMV）。了解极地船舶钢的疲劳断裂扩展行为对于确保安全至关重要。本研究通过实验研究，考察了水下航行器舵所用钢材在各种低温条件下的力学性能和疲劳断裂扩展情况。它比较并分析了不同低温下水下载人航行器舵钢的静态力学特性、疲劳裂纹扩展速率和断裂形态。研究结果表明，925A钢、20#钢及其焊接部件在低温条件下的屈服强度、抗拉强度、弹性模量和疲劳裂纹扩展寿命均有所提高。随着温度从20℃降至 -60℃，925A钢、20#钢及其焊接部件的抗拉强度分别提高了6.87%、14.61%和12.55%。屈服强度也分别提高了14.17%、29.09%和15.76%。在不同恒定低温条件下进行了疲劳裂纹扩展速率实验。本研究为未来的建模和实验测试提供了方向。
