Battelle two-curve model correction based on crack tip opening angle

被引：0
|
作者：
Ying Z. [1 ,2 ]
Qun C. [1 ,2 ]
Fagen L. [1 ,3 ]
Yuguang C. [1 ,2 ]
Ruiyan N. [1 ,2 ]
机构：
[1] College of Pipeline and Civil Engineering, China University of Petroleum, Shandong, Qingdao
[2] Shandong Province Key Laboratory of Oil & Gas Storage and Transportation on Safety, China University of Petroleum, Shandong, Qingdao
[3] CNPC, Tubular Goods Research Institute, Shaanxi, Xi'an
来源：
Shiyou Xuebao/Acta Petrolei Sinica | 2022年 / 43卷 / 11期
关键词：
crack arrest control; crack arrest prediction; crack tip opening angle; high steel-grade pipeline; two-curve model;
D O I：
10.7623/syxb202211011a
中图分类号：
学科分类号：
摘要：
The core of natural gas pipeline crack arrest control lies in the prediction of crack arrest toughness. For high steel-grade pipelines with high strength and toughness, the traditional Battelle two-curve model (BTCM)based on Charpy impact toughness is no longer applicable, and it is urgent to establish corresponding crack arrest control guidelines based on a new fracture parameter. To address this problem, the crack tip opening angle (ACTOA) > which has wide application prospect, is selected as the crack arrest toughness parameter to modify the BTCM. Firstly, based on the basic fact that the crack propagation process of pipeline is controlled by the critical ACTOA, a corresponding model for solving the crack arrest pressure of pipeline has been established using the energy balance theory. Further, based on the numerical simulation method for dynamic crack propagation in pipelines, combined with extensive calculations, the paper explores the relationship between crack front pressure and crack velocity under different critical ACTOA of crack arrest toughness. Based on the above results, the BTCM is modified, and a two-curve model based on the critical ACTOA (CBTCM)is set up for the first time. Through comparing the predicted results of crack arrest pressure and crack velocity from different models, it can be seen that the CBTCM model is expected to solve the problem that the predicted results of traditional models tend to indicate a dangerous state, and provides a new reference for the crack arrest control of high steel-grade pipelines. © 2022 Science Press. All rights reserved.
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页码：1642 / 1651+1663
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