Study on Numerical Simulation Method of Fracture Behavior of Pipeline Girth Weld

IF 1 4区工程技术 Q4 ENGINEERING, MECHANICAL

Journal of Pressure Vessel Technology-Transactions of the Asme Pub Date : 2023-05-03 DOI:10.1115/1.4062461

Q. Feng, Qun Chang, H. Jia, Yi Wu, L. Dai, Yuguang Cao

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引用次数: 1

Abstract

The failure accidents in girth weld of pipelines occur frequently due to the combination of internal defects and external loads., However, the research on the fracture behavior of girth weld defects is relatively poor at present. To solve this problem, the cracking behavior and strain evolution law of the inner wall defects of the pipe girth weld is studied in combination with full-scale tests (FST). The constitutive and GTN damage parameters of the pipe base metal zone, weld zone and heat-affected zone (HAZ) are calibrated through the small punch test (SPT) and single edge notch bending (SENB) test. On this basis, the welded pipe model with inner wall defects is established, and a numerical simulation method for dynamic fracture behavior based on damage mechanics is formed. The numerical simulation method is verified by FST data and theoretical calculation. The results show that the numerical results are consistent with the FST and theoretical calculation in the elastic stage, plastic stage and fracture stage, and the error is within 10%. The novel numerical simulation method is provided as a means for the fracture behavior research of pipeline girth weld.

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管道环焊缝断裂行为的数值模拟方法研究

由于内部缺陷和外部载荷的共同作用，管道环焊缝失效事故频繁发生。，然而，目前对环焊缝缺陷断裂行为的研究相对较少。为了解决这一问题，结合全尺寸试验研究了管道环焊缝内壁缺陷的开裂行为和应变演化规律。通过小冲孔试验（SPT）和单边缘缺口弯曲试验（SENB），对管道母材区、焊接区和热影响区的本构参数和GTN损伤参数进行了标定。在此基础上，建立了具有内壁缺陷的焊接管道模型，形成了基于损伤力学的动态断裂行为数值模拟方法。数值模拟方法通过FST数据和理论计算得到验证。结果表明，在弹性阶段、塑性阶段和断裂阶段，数值计算结果与FST和理论计算结果一致，误差在10%以内。为管道环焊缝断裂行为的研究提供了一种新的数值模拟方法。

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来源期刊

Journal of Pressure Vessel Technology-Transactions of the Asme 工程技术-工程：机械

CiteScore

2.10

自引率

10.00%

发文量

审稿时长

4.2 months

期刊介绍： The Journal of Pressure Vessel Technology is the premier publication for the highest-quality research and interpretive reports on the design, analysis, materials, fabrication, construction, inspection, operation, and failure prevention of pressure vessels, piping, pipelines, power and heating boilers, heat exchangers, reaction vessels, pumps, valves, and other pressure and temperature-bearing components, as well as the nondestructive evaluation of critical components in mechanical engineering applications. Not only does the Journal cover all topics dealing with the design and analysis of pressure vessels, piping, and components, but it also contains discussions of their related codes and standards. Applicable pressure technology areas of interest include: Dynamic and seismic analysis; Equipment qualification; Fabrication; Welding processes and integrity; Operation of vessels and piping; Fatigue and fracture prediction; Finite and boundary element methods; Fluid-structure interaction; High pressure engineering; Elevated temperature analysis and design; Inelastic analysis; Life extension; Lifeline earthquake engineering; PVP materials and their property databases; NDE; safety and reliability; Verification and qualification of software.