Please use this identifier to cite or link to this item:
Full metadata record
DC FieldValueLanguage
dc.contributor.authorHoo, Zhiong Shengen_US
dc.identifier.citationHoo, Z. S. (2022). Failure analysis of two 3D embedded cracks in offshore pipelines at the welding joints. Final Year Project (FYP), Nanyang Technological University, Singapore.
dc.description.abstractAn offshore pipeline is commonly subjected to large plastic deformation and repetitive fluctuating loadings. It can be due to the installation processes or ocean waves. Inevitably, such loadings affect the cracks that exist in the offshore pipelines and cause material fractures. Incidents such as oil leakage due to fracture failure will bring detrimental impacts to the production, transportation capacity and global economy as well as the environment. In fact, such failures are predictable and could be avoided if research works are carried out to simulate the behaviours of multiple cracks when the pipeline is subjected to a large strain deformation to identify the fracture criteria. In addition, it is observed that lots of cataclysmic fracture failures of pipelines were associated with accelerated fatigue crack growth due to the coalescence of multiple cracks. Unfortunately, most of the published works only focused on a single crack’s behaviour. The prediction of the service life of pipelines due to the multiple cracks is still a challenging issue to deal with as there are still multiple parameters affecting the fatigue life of pipelines to be discovered and analysed. This project aims to study the elastic-plastic stress on two 3D interacting embedded elliptical cracks in offshore pipelines to investigate its fracture criteria and fatigue behaviour. The main methodology employed for analysing these interacting cracks’ behaviour is finite element method (FEM) with using an existing commercial software package, ANSYS. The mechanical properties and dimensions of offshore pipeline, formulation of the finite element modelling and geometrical configuration of the interacting cracks are explained in detail. Next, the effect of various parameters on the fracture resistance (CTOD) and fatigue crack growth rate are evaluated with the use of tabular and graphical data. It shows that the results obtained by FEM are reasonable and reliable. Two coplanar cracks can be seen as a single isolated crack provided the separation distance is sufficiently large as compared to the crack sizes.en_US
dc.publisherNanyang Technological Universityen_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleFailure analysis of two 3D embedded cracks in offshore pipelines at the welding jointsen_US
dc.typeFinal Year Project (FYP)en_US
dc.contributor.supervisorXiao Zhongminen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.description.degreeBachelor of Engineering (Mechanical Engineering)en_US
item.fulltextWith Fulltext-
Appears in Collections:MAE Student Reports (FYP/IA/PA/PI)
Files in This Item:
File Description SizeFormat 
  Restricted Access
Failure Analysis of Two 3d Embedded Cracks in Offshore Pipelines at the Welding Joints8.18 MBAdobe PDFView/Open

Page view(s)

Updated on Nov 25, 2023

Download(s) 50

Updated on Nov 25, 2023

Google ScholarTM


Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.