摘要
本文针对海洋结构物用的一种新型钛合金材料,开展疲劳裂纹扩展速率和复杂载荷谱下保载-疲劳裂纹扩展速率试验研究,综合探讨上峰值保载时间和下峰值保载时间对该新型钛合金保载-疲劳裂纹扩展行为的影响规律;基于断裂力学理论,建立新型钛合金保载-疲劳裂纹扩展速率预报模型,采用试验方法验证该模型对新型钛合金保载-疲劳裂纹扩展行为的预报能力。研究结果表明:新型钛合金材料疲劳裂纹扩展行为对上、下峰值保载时间较敏感,随着上峰值和下峰值保载时间的增加,裂纹扩展速率增加,但是裂纹扩展速率增加的趋势逐渐减小,即上、下保载时间对新型钛合金材料裂纹扩展速率的影响具有一定的饱和值。提出了新型钛合金保载-疲劳裂纹扩展速率预报模型,对复杂载荷谱下的保载-疲劳裂纹扩展速率进行了预报研究,预报结果与试验结果吻合较好。
The fatigue and dwell-fatigue crack growth rate of a new titanium alloy under complex load spec-trum was investigated by experimental method while the influence of upper peak load dwell time and lower peak dwell time on the dwell-fatigue crack growth behavior was analyzed.Based on the fracture mechanics,a new dwell-fatigue crack growth rate prediction model was established for the new titanium alloy,and was ver-ified by experimental method.The results show that the crack growth behavior of the new titanium alloy mate-rial is sensitive to the upper and lower peak dwell time.The crack growth rate increases with the increase of the upper and lower peak dwell time,but the trend of increasing gradually decreases,indicating there exists a certain saturation value for the influence of dwell time on the crack growth rate of the new titanium alloy.A new dwell-fatigue crack growth rate prediction model for titanium alloys was proposed.The dwell-fatigue crack growth rates under complex load spectrum were predicted.The prediction results are in good agree-ment with the experimental ones.
作者
陈小平
雷银慧
曾庆波
袁青松
蒋泽
秦闯
韦朋余
CHEN Xiao-ping;LEI Yin-hui;ZENG Qing-bo;YUAN Qing-song;JIANG Ze;QIN Chuang;WEI Peng-yu(China Ship Scientific Research Center,Wuxi 214082,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《船舶力学》
EI
CSCD
北大核心
2023年第9期1346-1355,共10页
Journal of Ship Mechanics
