Study on the ultimate bearing capacity of high steel grade elbow with trench defects
Journal of Mechanical StrengthVol. 47, Issue 6, Pages: 124-131(2025)
作者机构:
1.常州大学 安全科学与工程学院,常州 213164
2.青岛青港通达能源有限公司,青岛 266555
3.长庆油田分公司 油气工艺研究院,西安 710018
作者简介:
ZHANG Ying, E-mail: aezy163@163.com
基金信息:
CNPC-Changzhou University Innovation Consortium Science and Technology Cooperation project(KYZ22020129);Jiangsu Province Graduate Student Practice Innovation Plan Project(SJCX23_1584)
ZHANG Tao,ZHANG Ying,ZHAO Pengcheng,et al. Study on the ultimate bearing capacity of high steel grade elbow with trench defects[J]. Journal of Mechanical Strength,2025,47(6):124-131.
ZHANG Tao,ZHANG Ying,ZHAO Pengcheng,et al. Study on the ultimate bearing capacity of high steel grade elbow with trench defects[J]. Journal of Mechanical Strength,2025,47(6):124-131. DOI: 10.16579/j.issn.1001.9669.2025.06.015.
Study on the ultimate bearing capacity of high steel grade elbow with trench defects
Elbows are an important component of oil and gas pipelines. The force state and the medium flow state are more complex than that of the straight pipe. Once the defect occurs at the elbow
the elbow pipe is more prone to fail. The high steel grade pipeline is the development trend of the long distance oil and gas pipeline construction
and it is urgent to evaluate the residual strength of the high steel grade bending pipe. Through the establishment of the finite element model
the defect size
relative position
bending radius
pipe parameters and pipe performance influence were studied on the ultimate internal pressure of the elbow
and finally the prediction formula of the bending was established. The results show that with the increase of defect length and defect depth
the ultimate internal pressure of the elbow is significantly reduced. The trench defect affects the ultimate internal pressure when the trench defect is located in the inner arch of the elbow. The bending radius
the wall thickness and the pipe material will affect the ultimate internal pressure. The error analysis shows that the prediction formula is more accurate
which can provide the basis for the residual strength evaluation of high steel grade elbows with trench defects.
关键词
Keywords
references
BAO S Y , QIN Z X , ZHU J , et al . Quickly analyze the limit load of thinning defect elbows with elastic modulus adjustment method [J]. International Journal of Pressure Vessels and Piping , 2021 , 194 : 104516 .
TONG Ke , XIE Xuedong , LI Liang , et al . Failure cause and typical case analysis of bending pipe used in oil and gas transmission [J]. Petroleum Tubular Goods & Instruments , 2016 , 2 ( 1 ): 46 - 49 . (In Chinese)
ZANG Xuerui , GU Xiaoting , WANG Qiuyan , et al . A failure pressure model for high-grade gas pipelines with corrosion defects [J]. Oil & Gas Storage and Transportation , 2019 , 38 ( 3 ): 285 - 290 . (In Chinese)
OH C S , KIM Y J , PARK C Y . Plastic loads of elbows with local wall thinning under in-plane bending [J]. International Journal of Fracture , 2007 , 145 ( 1 ): 63 - 79 .
LEE G H , SEO J K , PAIK J K . Condition assessment of damaged elbow in subsea pipelines [J]. Ships and Offshore Structures , 2017 , 12 ( 1 ): 135 - 151 .
DUAN Zhixiang , SHEN Shiming . Analysis and experiments on the plastic limit load of elbows with local thinned area under internal pressure [J]. Pressure Vessel Technology , 2005 , 22 ( 5 ): 1 - 3 . (In Chinese)
ZHOU Lingzhi , WANG Yu , QIE Yanhui , et al . Study on burst pressure of elbows with wall-thinning defects at inner arch [J]. Engineering Blasting , 2022 , 28 ( 3 ): 11 - 16 . (In Chinese)
DENG Jisong . Effect of element and mesh density on the results of finite element analysis [J]. Petro-chemical Equipment Technology , 2017 , 38 ( 1 ): 12 - 15 . (In Chinese)
ZHANG Bin , QIAN Chengwen , WANG Yumei , et al . Development and application of high-grade pipeline steel at home and abroad [J]. Petroleum Engineering Construction , 2012 , 38 ( 1 ): 1 - 4 . (In Chinese)
SADASUE T , LGI S , KUBO T , et al . Ductile cracking evaluation of X80/X100 high strength linepipes [C]// 2004 International Pipeline Conference , 2008 , 41766 : 1661 - 1669 .
SKELTON R P , MAIER H J , CHRIST H J . The Bauschinger effect,masing model and the Ramberg-Osgood relation for cyclic deformation in metals [J]. Materials Science and Engineering:A , 1997 , 238 ( 2 ): 377 - 390 .
KIM J W , YOON M S , PARK C Y . The effect of load-controlled bending load on the failure pressure of wall-thinned pipe elbows [J]. Nuclear Engineering and Design , 2013 , 265 : 174 - 183 .
CHOI J B , GOO B K , KIM J C , et al . Development of limit load solutions for corroded gas pipelines [J]. International Journal of Pressure Vessels and Piping , 2003 , 80 ( 2 ): 121 - 128 .
LI S J , ZHOU C Y , LI J , et al . Effect of bend angle on plastic limit loads of pipe bends under different load conditions [J]. International Journal of Mechanical Sciences , 2017 , 131 : 572 - 585 .
GOODALL I W . Lower bound limit analysis of curved tubes loaded by combined internal pressure and in-plane bending moment [Z]. Research Division Report No.RD/B/N4360,UK Central Electricity Generating Board , 1978 .