载荷波形对新型钛合金疲劳裂纹扩展行为影响研究  

Research on the effect of load waveform on dwell-fatigue crack growth behavior of a new type of titanium alloy

作　　者：王珂[1] 卞程程 黄翔宇 高龙乾 陈建新 WANG ke;BIAN Cheng-cheng;HUANG Xiang-yu;GAO Long-qian;CHEN Jian-xin(School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;China Classification Society Fuzhou Branch,Fuzhou 350001,China)

机构地区：[1]江苏科技大学船舶与海洋工程学院,江苏镇江212003 [2]中国船级社福州分社,福建福州350001

出　　处：《舰船科学技术》2022年第14期26-29,共4页Ship Science and Technology

基　　金：国家自然科学基金资助项目(51709134);国家重点研发计划项目(P2016YFC03007603-02);江苏省自然科学基金资助项目(BK20160559,BK20170575)。

摘　　要：深海载人潜水器作业过程中,耐压壳结构承受下潜(载荷增加)、巡航(上峰值保载)、上浮(载荷降低)、休整阶段(下峰值保载)和再次下潜的循环载荷作用。因此,针对潜水器用钛合金材料开展了疲劳、上峰值保载-疲劳(巡航)和上-下峰值保载-疲劳(巡航-休整)裂纹扩展速率试验研究。试验结果表明,钛合金上峰值保载-疲劳裂纹扩展速率高于疲劳裂纹扩展速率,并随着上峰保载时间的增加,上峰值保载-疲劳裂纹扩展速率越高;随着下峰值保载时间的引入,使得上-下峰值保载-疲劳裂纹扩展速率明显高于上峰值保载-疲劳裂纹扩展速率,并且裂纹扩展速率随着下峰值保载时间的增加而不断加快。During the service of deep-ocean manned submersible,the pressure shell in each operation bears loads as follows:diving stage(load increase),cruising state(upper peak load holding),floating stage(load decrease),rest stage(lower peak load holding).Therefore,this paper carried out the experimental study on the influence of upper peak load holding(cruising state)and upper-lower peak load holding(cruise-rest state)on the fatigue crack growth tests of new titanium alloy.The results show that the dwell-fatigue crack growth life under upper peak load holding is faster than the fatigue crack growth life,and the dwell-fatigue crack growth life of under upper-lower peak load holding is faster than the dwell-fatigue crack growth life under upper peak load holding.With the increase of the lower peak load holding time,the dwell-fatigue crack growth rate also increases.

关 键 词：上峰值保载 上-下峰值保载 保载-疲劳 保载时间 载荷波形 

分 类 号：U663.1[交通运输工程—船舶及航道工程]