连续油管钢LCF裂纹扩展的实验与数值研究

IF 0.6 4区工程技术 Q4 MECHANICS

Mechanika Pub Date : 2022-10-21 DOI:10.5755/j02.mech.31056

J. Zhong, Guanghui Zhao, Litong Wang, Yi He, Siou-Han Hu

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引用次数: 0

摘要

连续油管(CT)是一种无接头的长油管，缠绕在卷筒上，可以连续下入和拉出。由于连续油管运行过程的特殊性，其低周疲劳失效是其主要的生产成本。针对CT直径小、壁薄的特点，设计并加工了单侧缺口电弧试件。LCF试验采用力控模式进行。研究了CT钢的循环软化过程，并测量了裂纹扩展速率。同时进行有限元模拟，得到j积分、裂纹尺寸与载荷之间的关系。基于实验和数值结果，将CT钢的LCF裂纹扩展速度表示为j积分的显式函数。为从裂纹扩展的角度预测CT在工作状态下的LCF寿命提供了依据。

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Experimental and Numerical Study on LCF Crack Propagation of Coiled Tubing Steel

Coiled tubing (CT) is a joint-less long oil pipe that is wound around a reel and can be run and pulled continuously. Due to the particularity of the operating process, low-cycle fatigue (LCF) failure of the CT constitutes the main production cost. Aiming at the characteristics of small diameter and thin wall of CT, a single-edge-notched (SEN) arc specimen was designed and machined. LCF tests were conducted with force-controlled mode. Cyclic softening of the CT steel was presented and crack growing rates were measured. Meanwhile, finite element simulation was carried out to obtain the relationships among J-integral, crack size and load. Based on the experimental and numerical results, the speed of the LCF crack growth of the CT steel is expressed as an explicit function of the J-integral. It provides a basis for predicting the LCF life of the CT under working conditions from the perspective of crack propagation.

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来源期刊

Mechanika 物理-力学

CiteScore

1.30

自引率

0.00%

发文量

审稿时长

3 months

期刊介绍： The journal is publishing scientific papers dealing with the following problems: Mechanics of Solid Bodies; Mechanics of Fluids and Gases; Dynamics of Mechanical Systems; Design and Optimization of Mechanical Systems; Mechanical Technologies.