Crack tip opening displacement (CTOD) of the heat-affected zone of the 31.8 mm thick L485 pipeline steel girth welded joint was tested using the single edge notch tension (SENT) test method. The distribution fitting of 18 test results was carried out by using the mathematical statistical method and the distribution law of CTOD was determined by using A-D method and K-S method. The results show that, δm and δ0.2 obey normal and lognormal distributions respectively, and the specific quantile CTOD values of them are obtained. Comparative analysis shows that CTOD value (δm and δ0.2) determined by MOTE method is between 5% ~ 10% quantiles of probability distribution. The 10% quantile value (δm) of normal distribution and the 5% quantile value (δ0.2) of lognormal distribution are consistent with the recommended practice of BS7910, indicating that the quantile method of CTOD value probability distribution function is a reasonable and feasible method to deal with discrete fracture toughness.
WANG Lei
,
SONG Gaofeng
,
SU Danghong
,
ZHENG Yixiang
,
CHEN Hongyuan
,
JI Lingkang
. Distribution law and statistical treatment method of fracture toughness in heat-affected zone of the girth weld[J]. Transactions of The China Welding Institution, 2023
, 44(6)
: 27
-34
.
DOI: 10.12073/j.hjxb.20220712001
[1] 何小东, 高 琦, 李为卫, 等. 高钢级油气管道环焊缝接头性能及质量控制[J]. 石油管材与仪器, 2020, 6(2): 15 - 20
He Xiaodong, Gao Qi, Li Weiwei, et al. Performance and quality control of high strength pipeline girth weld joints[J]. Petroleum Tubular Goods & Instruments, 2020, 6(2): 15 - 20
[2] Yin Xiaohui, He Guoqiang, Liu Sihan, et al. Effect of welding pressure on mechanical properties of resistance spot welding joint[J]. China Welding, 2020, 29(3): 33 - 38.
[3] 李一哲, 王东坡, 邓彩艳, 等. 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
Li Yizhe, Wang Dongpo, Deng Caiyan, et al. Conparasion of methods to determine CTOD from single edge notched specimens[J]. Transactions of the China Welding Institution, 2017, 38(4): 59 - 62
[4] Zhu X K. Progress in development of fracture toughness test methods for SENT specimens[J]. International Journal of Pressure Vessels and Piping, 2017, 156: 40 - 58.
[5] Zhu X K, Joyce J A. Review of fracture toughness (G, K, J, CTOD, CTOA) testing and standardization[J]. Engineering Fracture Mechanics, 2012, 85: 1 - 46.
[6] 何小东, 高雄雄, David Han, 等. 高铌X80管道不同强度匹配环焊缝接头性能及应变演化[J]. 焊接学报, 2022, 43(2): 37 - 39
He Xiaodong, Gao Xiongxiong, David Han, et al. Performance and strain evolution of different strength matching girth welds of high Nb X80 pipeline[J]. Transactions of the China Welding Institution, 2022, 43(2): 37 - 39
[7] Jutla T, Garwood S J. Interpretation of fracture toughness data[J]. Metal Construction, 1987, 19(5): 276 - 281.
[8] BS 7910 Guide to methods for assessing the acceptability of flaws in metallic structures[S]. London: British Standards Institution, 2019.
[9] DNV Recommended Practice DNVGL-RP-F108. Fracture control for pipeline installation methods introducing cyclic plastic strain[S]. Norway: Det Norske Veritas, 2006.
[10] Sintap: structural INTegrity assessment procedures for european industry[S]. Rotherham: European Union, 1999.
[11] 何小东, 高雄雄, David Han, 等. 不同强度匹配的X80钢环焊接头力学性能及变形能力[J]. 油气储运. 41(1):63-69, 2022, 41(1): 63 - 69
He Xiaodong, Gao Xiongxiong, David Han, et al. Mechanical performance and deformability of X80 steel girth welded joints with different strength matching[J]. Oil & Gas Storage and Transportation, 2022, 41(1): 63 - 69
[12] BS 8571-2018 Method of test for determination of fracture toughness in metallic materials using single edge notched tension (SENT) specimens[S]. London: British Standards Institution, 2018.
[13] BMT Fleet Technology. Measurement of crack-tip opening displacement (CTOD) and J-fracture resistance curves using single edge notched tension (SENT) specimens[S]. British: BMT Fleet Technology, 2013.
[14] 龚宝明, 田润明, 刘秀国, 等. 基于单边缺口拉伸试样的环缝接头阻力曲线确定方法对比[J]. 焊接学报, 2022, 43(5): 21 - 28
Gong Baoming, Tian Runming, Liu Xiuguo, et al. Comparative study on determination methods of resistance curves of circular joints based on single edge notched tensile specimens[J]. Transactions of the China Welding Institution, 2022, 43(5): 21 - 28
[15] Moore P L, Pisarski H G, London T. Validation of methods to determine CTOD from SENT specimens [C]//The 22nd International Ocean nand Polar Engineering Conference. Rodos Palace Hotel, 2012.
[16] Zhu X K, Paul Z, Tom M. Comparative study of CTOD-resistance curve test methods for SENT specimens[J]. Engineering Fracture Mechanics, 2017, 172: 17 - 38.
[17] Verstraete M A, Denys R M, Van Minnebruggen K, et al. Determination of CTOD resistance curves in side- grooved single-edge notched tensile specimens using full field deformation measurements[J]. Engineering Fracture Mechanics, 2013, 110: 12.
[18] Pisarski, Henryk. Treatment of fracture toughness data for engineering critical assessment (ECA)[J]. Welding in the World, 2017, 61(4): 1 - 10.
[19] Xia Ziyu, Peng Sheng, Miao Zhangmu, et al. Research on the fracture toughness and remaining life of pipeline steel X70 based on the probability method[J]. Journal of Ship Mechanics, 2019, 23(3): 301 - 306.
[20] 夏子钰, 苗张木. 基于SINTAP的管线钢X70断裂韧度CTOD分布规律及检验分析[J]. 焊接学报, 2017, 38(9): 124 - 128
Xia Ziyu, Miao Zhangmu, Peng Sheng. CTOD distribution law and distribution fitting of pipeline steel X70 based on SINTAP[J]. Transactions of the China Welding Institution, 2017, 38(9): 124 - 128
