X70管线钢管环焊接头在低约束条件下的断裂韧性
Fracture Toughness of X70 Steel Pipeline Girth Weld under Low Constraint Condition Joint
摘 要
针对基于应变设计的X70管线钢管, 采用单边缺口拉伸试验对该钢钢管环焊缝金属及热影响区的裂纹尖端张开位移进行研究, 获得了裂纹延性扩展过程的断裂阻力曲线, 并对热影响区试样的试验结果进行了有效性验证。结果表明:热影响区试样的裂纹尖端距熔合线的距离在0.5 mm以内,焊缝金属和热影响区试样的断裂阻力曲线分别为δ=1.395 78(Δa)0.783 35, δ=1.553 38(Δa)0.821 75;采用单边缺口拉伸试验能准确测出管线钢环焊接头在低约束条件下的断裂韧性;试验结果可以为管线基于应变设计和工程临界评价提供依据。
环焊接头
裂纹尖端张开位移
单边缺口拉伸试验
断裂阻力曲线
X70 pipeline steel
girth weld joint
crack tip opening displacement
single edge notch tensile test
fracture resistance curve
Abstract
The single-edge-notched-tensile (SENT) test was carried out on strain-based design of X70 steel pipeline to measure crack tip opening displacement of girth weld metal and heat affected zone. The fracture resistance curves during crack ductile extension process were obtained and tested results of heat affected zone sample were validated. The results show that the distance from crack tip of heat affected zone sample to fusion line was within 0.5 mm. Fracture resistance curves of weld metal and heat affected zone samples as followed: δ=1.395 78(Δa)0.783 35, δ=1.553 38(Δa)0.821 75. Fracture toughness of pipeline girth weld under low constraint condition can be accurately measured by SENT test. The tested results can provide evidence for strain-based design pipeline and engineering critical assessment.
中图分类号 TG404 DOI 10.11973/jxgccl201603007
所属栏目 试验研究
基金项目 中国石油科技创新基金资助项目(2013D-5006-0602)
收稿日期 2015/3/25
修改稿日期 2015/9/27
网络出版日期
作者单位点击查看
备注唐家睿(1991-), 男, 陕西宝鸡人, 硕士研究生。
引用该论文: TANG Jia-rui,CHEN Hong-yuan,GAO Hui-lin,JI Ling-kang. Fracture Toughness of X70 Steel Pipeline Girth Weld under Low Constraint Condition Joint[J]. Materials for mechancial engineering, 2016, 40(3): 27～30
唐家睿,陈宏远,高惠临,吉玲康. X70管线钢管环焊接头在低约束条件下的断裂韧性[J]. 机械工程材料, 2016, 40(3): 27～30
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参考文献
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【2】杨东平,胥聪敏,盛燕.0.8设计系数用X80管线钢焊接接头的失效评估曲线［J］.机械工程材料,2014,38(9):47-50.
【3】李继红,杨亮,张敏.X100管线钢焊接接头的显微组织和性能［J］.机械工程材料,2014,38(2):59-62.
【4】马朝晖. 基于应变设计X70管线钢管高强匹配环缝焊接性评估［J］.宝钢技术,2014(3):1-4.
【5】刘硕. 管线钢管环焊接头CTOD断裂韧性评估技术［J］.宝钢技术,2014(3):46-53.
【6】姚登樽,隋永莉,孙哲. X70管线钢管环焊缝宽板拉伸试验［J］.焊管,2014,37(6):26-30.
【7】CHENG W, TANG H, GIOIELLI P C, et al. Test methods for characterization of strain capacity: comparision of R-curves from SENT/CWP/FS tests［C］// Pipe Technology conference.［S.l.］:［s.n］, 2009:12-14.
【8】FAIRCHILD D P, SHAFROVA S Y, TANG H, et al. Observations on the design, execution, and use of full-scale testing for strain-based design pipelines［C］// Proceedings of the Twenty-fourth (2014) International Ocean and Polar Engineering Conference. ［S.l.］:［s.n］, 2014:556-565.
【9】KALYANAM S, WILKOWSKI G M, SHIM D J. Why conduct sen(t) tests and considerations in conducting/analyzing sen(t) testing［C］// Proceedings of the 8th International Pipeline Conference.［S.l.］:［s.n］,2010: 337-346.
【10】徐杰. 管线钢裂尖约束对韧脆断裂行为的影响［D］.北京: 北京科技大学,2009.
【11】SHEN G, TYSON W R. Crack size evaluation using unloading compliance in single-specimen single-edge notched tension fracture toughness testing［J］. Testing and Evaluation,2014,37(4):1-11.
【12】VERSTRAETE M A, HERTEL S, DENYS R M, et al. Evaluation and interpretation of ductile crack extension in SENT specimens using unloading compliance technique［J］. Engineering Fracture Mechanics,2014, 115: 190-203.
【13】TANG H, MACIA M, MINNAAR K. Development of the SENT test for strain-based design of welded pipelines［C］// Proceedings of the 8th International Pipeline Conference［S.l.］:［s.n］, 2010: 303-312.
【14】KIBEY S, WANG X, MINNAAR K, et al. Tensile strain capacity equations for strain-based design of welded pipelines［C］//2010 8th International Pipeline Conference. ［S.l.］:American Society of Mechanical Engineers, 2010: 355-363.
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