| 单边缺口拉伸试样的断裂韧性计算方法对比 |
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| 引用本文： | 李一哲,王东坡,邓彩艳,龚宝明,王胜.单边缺口拉伸试样的断裂韧性计算方法对比[J].焊接学报,2017,38(4):59-62. |
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| 作者姓名： | 李一哲 王东坡 邓彩艳 龚宝明 王胜 |
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| 作者单位： | 1.天津大学 材料科学与工程学院天津市现代连接技术重点实验室, 天津 300072 |
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| 基金项目： | 国家自然科学基金项目，国家教育部博士点专项基金 |
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| 摘 要： | 在工程临界评估（engineering critical assessment）中，裂纹尖端张开位移（CTOD值）的精确性将极大影响设计安全裕度与服役寿命.单边缺口拉伸（SENT）试样裂纹尖端的应力应变场与管道在实际服役状况下相似，被认为比较适用于测量管道CTOD值.目前有几种针对SENT断裂韧性的计算方法，但是并没有统一的标准.文中采用API X70管线钢，进行SENT试样断裂韧性试验并对比各计算方法与双刀口法之间的区别.采用Crackwise 4.0评估了不同计算方法得到韧性值对裂纹极限尺寸的影响.结果表明，几种CTOD计算方法相较于双引伸计法都有较大误差，断裂韧性的精确度对于ECA评估极限裂纹尺寸有极大影响.
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| 关 键 词： | 断裂韧性 合于使用 验证 评估 |
| 收稿时间： | 2015/4/7 0:00:00 |
Comparasion of methods to determine CTOD from single edge notched specimens |
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| LI Yizhe,WANG Dongpo,DENG Caiyan,GONG Baoming and WANG Sheng.Comparasion of methods to determine CTOD from single edge notched specimens[J].Transactions of The China Welding Institution,2017,38(4):59-62. |
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| Authors: | LI Yizhe WANG Dongpo DENG Caiyan GONG Baoming and WANG Sheng |
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| Affiliation: | 1.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China2.Shenzhen Chiwan Wins Treasure Prosperous Engineering Co., LTD, Shenzhen 518000, China |
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| Abstract: | The determination of CTOD(crack tip opening displacement) has significantly affected the safety margin of design as well as the service life in enginnering critical assessment.Single edge notched tension(SENT) specimens is considered appropriate for the determination of CTOD in pipelines.There are several calculation methods against CTOD of SENT specimens while no unified standard has been agreed.In this paper,comparasion between various methods and the double-clip method for API X70 steel through SENT experiment is conducted.Evaluation of influece on critical crack size by different calculation methods with Crackwise 4.0 is performed.Compared with the double clip method,other calculation methods for CTOD deviated significantly, and the accuracy of fracture toughness has a great inlfuence on critical crack size of ECA assessment. |
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| Keywords: | fracture toughness fitness for service validation evaluation |
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