Finite Element Stress Analysis of Pipelines with Advanced Composite Repair
The efficiency of the composite material wraps, used to repair hydrocarbon transmission pipelines with local metal loss defects (also called volumetric surface defects—VSD), depends on the parameters (pipe material and geometry, VSD geometry, loading conditions, etc.) used within the numerical analyses and experimental tests. On coupled interactive system “piping → defect (VSD) → polymeric filler → polymeric adhesive → layer of different types of fibers → closing polymeric adhesive”, subjected to internal pressure, it is performed quantitative and qualitative evaluating the influence of these structural components and the availability of bearing capacity. As the most adequate pipe materials have been considered the ISO steel grades L290 and L360. The pipe and VSD geometries have been selected with aim to compare the results of our research work with a similar study, i.e., extensive experimental program, presented in different sections. The preliminary results of FEA simulations were obtained in the plastic behavior region. At the first phase of the analysis, the following optimal values for the mechanical properties of the filler, used in the composite repair system have been evaluated as follows: Young modulus E f = 25,000–35,000 MPa and tensile strength R m = 60 MPa. At the second phase, the mechanical properties of the composite material wrap, used for repair, have been considered and their optimal values have been defined as follows: Young modulus E c = 60,000 MPa and tensile strength R mC = 600 MPa, corresponding to the higher values assumed in the analyses.
KeywordsFinite element analysis (FEA) Composite wrap Filler Volumetric surface defect (VSD) Mechanical properties Stress
This study was financially supported by the 7th EU Frame Program, Maria Curie Initiative, Project “INNOPIPES”, PIRSES-GA-2012-318874 (“Innovative methods of nondestructive control and composite repair of pipelines with defects of their surface with the use of composites”).
- 3.Theory Reference for the Mechanical APDL and Mechanical Applications, ANSYS, April 2009Google Scholar
- 4.ISO/TS 24817:2006, in Petroleum, petrochemical and natural gas industries—Composite repairs for pipework—Qualification and design, installation, testing and inspection (2006)Google Scholar
- 7.B.J. Mac Donald, Practical Stress Analysis With Finite Elements (Glasnevin Publishing, Dublin, Ireland, 2007)Google Scholar