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High-Cycle Fatigue Properties and Damage Mechanism of Q345B Structural Steel
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High-Cycle Fatigue Properties and Damage Mechanism of Q345B Structural Steel
Інші назви:
Характеристики многоцикловой усталости и механизм повреждения конструкционной стали Q345B
Тема:
Научно-технический раздел
УДК:
539.4
Посилання:
High-Cycle Fatigue Properties and Damage Mechanism of Q345B Structural Steel / X.L. Hu, Y.J. Liu, M.K. Khan, Q.Y. Wang // Проблемы прочности. — 2017. — № 1. — С. 79-86. — Бібліогр.: 16 назв. — англ.
Підтримка:
The authors gratefully acknowledged the financial supports from the National Science Foundation of China (NSFC-11172188, 11302142) and the Program for Changjiang Scholars and Innovative Research Team (IRT14R37).
Дата:
2017
Переглядів:
410
Завантажень:
332
Анотація:
The high-cycle fatigue behavior of Q345B structural steel was investigated experimentally. Highfrequency vibration fatigue testing machine and scanning electron microscopy were used to study the high-cycle fatigue S—N curve characteristics and crack initiation mechanism at ambient temperature. The surface temperature of the specimens was monitored. The relation between the fatigue limit and the amount of heat dissipation was also investigated. It was found that the fatigue life changed inversely with the stress amplitude in the high-cycle range. The fatigue limit in high cycle range was obtained from heat dissipation in the specimen and found to have good agreement with the S—N curve. The crack initiation was attributed to the surface defects and the persistent slip bands due to the cycle slip in fatigue loading.
