Finite Element-based Methods for Dent Assessment on Pipelines

zhao, jian

Finite Element-based Methods for Dent Assessment on Pipelines

dc.contributor.advisor	Cheng, Yufeng(Frank)
dc.contributor.author	zhao, jian
dc.contributor.committeemember	Li, Leping
dc.contributor.committeemember	Tiamiyu, Ahmed Alade
dc.contributor.committeemember	Zhou, Qi
dc.contributor.committeemember	Chen, Zengtao
dc.date	2024-02
dc.date.accessioned	2023-12-21T14:58:14Z
dc.date.available	2023-12-21T14:58:14Z
dc.date.issued	2023-12-19
dc.description.abstract	As a well-developed form for energy transportation over wide ranges and long distances, pipelines always encounter various threats in service. In recent years, with the strong demand of clean energy, hydrogen transport in existing pipelines induces new challenges to the pipelines. Dent is a common mechanical defect present on pipelines, compromising structural integrity and causing pipeline failures. To date, there have been limited methods available to assess dent, and a dent combined with other types of defects such as corrosion. In this work, novel methods and criteria were developed for assessment of pipeline dent, corrosion in dent and hydrogen distribution at the dent using finite element (FE) modeling. Denting and spring-back processes were modeled and plain dents were created on the pipeline. A new criterion based on ductile damage failure indicator analysis was proposed. Pressure-bearing capacity was assessed on corroded pipelines containing a dent, where the mutual interaction between corrosion and the dent were determined. In addition, a method was developed to assess the corrosion in dent by considering both mechanical and electrochemical forces. For dented pipelines repurposed for transporting hydrogen gas, a FE-based model was developed to determine the stress/strain and H atom concentrations at the dent, where denting, spring-back and cyclic loading processes were modeled. Furthermore, the hydrogen-induced crack initiation on the pipeline subject to denting process was investigated using the phase field method.
dc.identifier.citation	Zhao, J. (2023). Finite element-based methods for dent assessment on pipelines (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.
dc.identifier.uri	https://hdl.handle.net/1880/117783
dc.language.iso	en
dc.publisher.faculty	Schulich School of Engineering
dc.publisher.institution	University of Calgary
dc.rights	University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.subject.classification	Engineering
dc.subject.classification	Engineering--Mechanical
dc.subject.classification	Materials Science
dc.title	Finite Element-based Methods for Dent Assessment on Pipelines
dc.type	doctoral thesis
thesis.degree.discipline	Engineering – Mechanical & Manufacturing
thesis.degree.grantor	University of Calgary
thesis.degree.name	Doctor of Philosophy (PhD)
ucalgary.thesis.accesssetbystudent	I do not require a thesis withhold – my thesis will have open access and can be viewed and downloaded publicly as soon as possible.