Study on the Overload and Dwell-Fatigue Property of Titanium Alloy in Manned Deep Submersible

作     者：WANG Ke WU Li LI Yong-zheng SUN Xiao-peng WANG Ke;WU Li;LI Yong-zheng;SUN Xiao-peng

作者机构：School of Naval Architecture and Ocean EngineeringJiangsu University of Science and TechnologyZhenjiang 212003China 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2020年第34卷第5期

页      面：738-745页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China (Grant No. 51709134) the National Key R&D Program of China (Grant No. 2016YFC0300603-02) the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20160559 and BK20170575) 

主　　题：manned cabin dwell fatigue crack growth rate Ti-6Al-4V load sequence effect 

摘      要：With the rapid development of ocean technology, the deep-sea manned submersible is regarded as a high-tech equipment for the exploration and exploitation of ocean resources. The safety of manned cabin has a decisive effect on the whole system. Ti-6 Al-4 V with the superior strength-to-weight ratio and corrosion resistance has been used for the manned cabin. The manned cabin experiences loading spectrum with different maximum stresses and different dwell time during their service life. The load sequence effects on dwell fatigue crack growth behavior of Ti-6 Al-4 V under different dwell time are investigated experimentally in this paper. The experimental results show that the crack tip plastic zone is enlarged by the dwell time and the overload retardation zone increases with dwell time under the same overload rate. A dwell fatigue crack growth model is proposed by modifying the crack tip plastic zone under the loading history with combinations of the single overload and dwell time factors are included in the modified model. Based on the experimental data, the overload retardation zone and the crack growth rates of Ti-6 Al-4 V are predicted by the modified model. A reasonable model for the load sequence effect on the dwell fatigue crack growth rates of Ti-6 Al-4 V is verified.