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材料导报  2023, Vol. 37 Issue (19): 22050330-7    https://doi.org/10.11896/cldb.22050330
  金属与金属基复合材料 |
应力比对EH36钢在海洋腐蚀环境中疲劳裂纹扩展速率的影响
钟颖1, 邵永波1,*, 高旭东2, 罗霞飞2, 朱红梅2, 杨冬平3
1 西南石油大学土木工程与测绘学院,成都 610500
2 西南石油大学机电工程学院,成都 610500
3 中国石化胜利油田技术检测中心,山东 东营 257062
Effect of Stress Ratio on Fatigue Crack Growth Rate of EH36 Steel in the Marine Corrosive Environment
ZHONG Ying1, SHAO Yongbo1,*, GAO Xudong2, LUO Xiafei2, ZHU Hongmei2, YANG Dongping3
1 School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China
2 School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China
3 Technology Inspection Center, China Petroleum & Chemical Corporation, Dongying 257062, Shandong, China
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摘要 EH36钢因强度高、低温韧性好、自重较轻等性能优势而被广泛应用于大型海洋平台。为评估在海洋腐蚀环境中改变应力比对EH36钢腐蚀疲劳性能的影响,采用三级应力比(R=0.1、0.3、0.5)分别开展了空气环境、海水全浸环境和海水浪溅环境中EH36钢的疲劳裂纹扩展试验。在同一应力强度因子幅值(ΔK)下,EH36钢在三种环境中均表现出应力比R升高对疲劳裂纹扩展速率da/dN的加速作用。空气环境中应力比对裂纹扩展速率会产生较大影响,对材料常数C和m影响很小,但在海水全浸环境和海水浪溅环境中,应力比增大不仅促进了裂纹扩展,而且使材料常数C和m发生变化。载荷条件相同时,海水全浸环境和海水浪溅环境中的裂纹扩展速率明显大于空气环境中的裂纹扩展速率,两种腐蚀环境对疲劳裂纹扩展行为的作用效果基本一致。通过观察断口形貌发现空气中的试件断口形貌表现为准解理特征,海水全浸环境和海水浪溅环境中的CT试件断口形貌大致相同,更接近于解理断裂。
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钟颖
邵永波
高旭东
罗霞飞
朱红梅
杨冬平
关键词:  EH36钢  海水浪溅环境  应力比  疲劳裂纹扩展速率  断口形貌    
Abstract: EH36 steel is widely used in large offshore platforms due to its high strength, excellent toughness at low temperature and light weight. To eva-luate the influence of stress ratio on the corrosion fatigue performance of EH36 steel in the marine corrosive environment, the fatigue crack growth tests of EH36 steel were carried out in laboratory air, seawater environment and splashing environment at three different stress ratios (R=0.1, 0.3, 0.5), respectively. It is concluded that the fatigue crack growth rate of EH36 steel was accelerated by increasing stress ratio R in all three environments for a given value of the stress intensity factor range (ΔK). The stress ratio R has great influence on the crack growth rate in air, but has little effect on the material constants C and m. Increasing the stress ratio in the seawater and splashing environment promotes crack growth and changes the material constants C and m as well. It is evident that the crack growth rates in seawater and splashing environment are higher than those in the air under the same loading conditions, and the effects of both corrosion environments have almost identical effects on fatigue crack growth behavior. The fracture morphology of the specimens in the air environment shows quasi-cleavage fracture characteristics. It is almost the same fracture morphology in both corrosion environments, which is close to cleavage fracture.
Key words:  EH36 steel    seawater splash environment    stress ratio    fatigue crack growth rate    fracture morphology
出版日期:  2023-10-10      发布日期:  2023-09-28
ZTFLH:  TG172.5  
基金资助: 国家自然科学基金(52078441)
通讯作者:  *邵永波,教授,博士研究生导师。本科和硕士研究生毕业于清华大学工程力学系,博士毕业于新加坡南洋理工大学。一直从事结构工程、海洋工程钢结构和机械强度理论方面的教学科研工作。专注于钢结构疲劳断裂、抗震、抗火、抗冲击性能及结构安全评估和加固方面的研究。承担国家自然科学基金、四川省青年科技创新研究团队等省部级项目和企业委托项目20余项。发表学术论文160余篇,参编行业标准3部。 ybshao@swpu.edu.cn   
作者简介:  钟颖,2016年毕业于新余学院,获得学士学位。2020年9月至今在西南石油大学土木工程与测绘学院攻读硕士学位,在邵永波教授的指导下进行研究。目前主要研究领域为疲劳与断裂。
引用本文:    
钟颖, 邵永波, 高旭东, 罗霞飞, 朱红梅, 杨冬平. 应力比对EH36钢在海洋腐蚀环境中疲劳裂纹扩展速率的影响[J]. 材料导报, 2023, 37(19): 22050330-7.
ZHONG Ying, SHAO Yongbo, GAO Xudong, LUO Xiafei, ZHU Hongmei, YANG Dongping. Effect of Stress Ratio on Fatigue Crack Growth Rate of EH36 Steel in the Marine Corrosive Environment. Materials Reports, 2023, 37(19): 22050330-7.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.22050330  或          http://www.mater-rep.com/CN/Y2023/V37/I19/22050330
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