Evaluation of water supply steel pipeline mechanical property under internal corrosion based on chemo-mechanical model

doi:10.3785/j.issn.1008-973X.2024.08.015

Journal of ZheJiang University (Engineering Science)

2024, Vol. 58

Issue (8): 1681-1690 DOI: 10.3785/j.issn.1008-973X.2024.08.015

Evaluation of water supply steel pipeline mechanical property under internal corrosion based on chemo-mechanical model

Renzhu PENG1(

),Suzhen LI1,2,*(

)

1. Department of Building Engineering, Tongji University, Shanghai 200092, China
2. State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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Abstract

A corrosion depth prediction model based on the electrochemical corrosion mechanism was proposed in order to address the limitations of existing steel pipe corrosion depth prediction models, which do not consider the electrochemical corrosion mechanism and are difficult to generalize to different application scenarios. Dissolved oxygen mass concentration and water temperature monitoring data were used as inputs to predict the average corrosion depth of the pipe wall. A chemo-mechanical model was proposed combined with the corrosion depth prediction model, an empirical formula for corrosion depth-mechanical performance degradation and the Chaboche constitutive model in order to estimate the uniaxial stress-strain curve of the corroded pipe material. This uniaxial stress-strain curve can serve as a basis for the safety assessment of pipeline structures throughout their entire operational lifespan. A case study of an operational water supply steel pipe validated the rationality and feasibility of the model by using real-time monitoring data.

Key words： municipal engineering water steel pipeline chemo-mechanical model electrochemical corrosion uniaxial stress-strain curve

Received: 18 July 2023 Published: 23 July 2024

CLC:

TU 990

Fund: 国家自然科学基金资助项目（52378525）；土木工程防灾国家重点实验室自主课题研究基金资助项目（SLDRCE19-B-25）.

Corresponding Authors: Suzhen LI E-mail: 2111363@tongji.edu.cn;lszh@tongji.edu.cn

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Cite this article:

Renzhu PENG,Suzhen LI. Evaluation of water supply steel pipeline mechanical property under internal corrosion based on chemo-mechanical model. Journal of ZheJiang University (Engineering Science), 2024, 58(8): 1681-1690.

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https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2024.08.015 OR https://www.zjujournals.com/eng/Y2024/V58/I8/1681

基于化力模型的供水钢管内腐蚀力学性能评估

为了解决已有钢管腐蚀深度预测模型未考虑电化学腐蚀机理，难以泛化到不同应用场景的问题，提出基于电化学腐蚀机理的腐蚀深度预测模型. 该模型以溶解氧质量浓度和水温监测数据作为输入，预测管壁平均腐蚀深度. 结合腐蚀深度预测模型、腐蚀深度-力学性能退化经验公式及Chaboche本构模型，提出化力模型，用于估算腐蚀后管材的单轴应力-应变曲线. 该单轴应力-应变曲线可以为全寿命运营周期内管道结构的安全评估提供依据. 以某根服役的供水钢管为案例，结合实时监测数据，验证了该模型的合理性和可行性.

关键词： 市政工程, 供水钢管, 化力模型, 电化学腐蚀, 单轴应力-应变曲线

Fig.1 Overall scheme of proposed chemo-mechanical model

Fig.2 Three-stage schematic diagram of electrochemical corrosion in water supply pipeline

Tab.1 Parameter identification result of corrosion rate prediction model

Fig.3 Empirical law of steel mechanical property degradation due to corrosion obtained by researchers

Fig.4 Measured dissolved oxygen mass concentration and water temperature of field testing

Fig.5 Corrosion rate of steel and ductile pipe calculated by electrochemical corrosion rate prediction model

Tab.2 Parameter of proposed electrochemical corrosion rate prediction model

Fig.6 Measured pH value, velocity of flow and internal pressure of field testing

Fig.7 Corrosion rate calculated by existing empirical model

Fig.8 Variation of average corrosion depth with diffusion coefficient　　　　　　

Tab.3 Parameter of Chaboche constitutive model^[26]

Fig.9 Time-varying uniaxial stress-strain curve of pipeline induced by internal corrosion


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