Buckling analysis of structures with corrosion under insulation

Student thesis: Master's Thesis

Abstract

The primary motivation behind this piece of research is the lack of information relating to the effect of the insulation and jacketing material’s mechanical properties on the overall buckling strength of a steel structure. Very little research has been completed that focuses on the effect of different materials on the overall buckling value at varying stages of corrosion. It is expected that this thesis will act as the starting point for further research into the issue in the future. More detailed and accurate information relating to the mechanical properties of the insulation and jacketing is required to allow for more effective computational modelling of the problem.Corrosion and corrosion under insulation are both topics that have been researched over a long period of time and yet there are still instances where the effects of corrosion have caused issues and problems from minor to catastrophic levels over this time. These incidents have led to the loss of human life, irreparable damage to the environment as well as costly repairs and shutdown times, not to mention reputation damage to the companies involved in such incidents.Modelling the problem of corrosion under insulation to determine the effect of the insulation system on the buckling value result was performed in four stages. The author’s style of coding using the ANSYS Mechanical APDL programme required initial validation. This was completed through comparison of the written code in both 2-D and 3-D formats against an already published version. Once the author’s style of coding was validated and considered acceptable for further computational work the next stage involved a mesh convergence study.Two plate configurations with differing levels of corrosion damage were modelled and underwent buckling analysis at four varying levels of mesh coarseness to determine the best compromise between accurate results and acceptable computation time.Once the preliminary computational work was completed the next stage involved modelling a steel plate with five levels of corrosion that also had an insulation system composed of one of six insulation materials and one of two protective jacketing materials. These plate and insulation system configurations were then subjected to axial buckling to determine the effect of the thickness of each component of the insulation system on the buckling value. The final stage involved modelling a hollow slender pipe system with the most common insulation systems to determine the effects of the materials on the new configuration.As hypothesised the buckling value decreased as the corrosion damage of the steel components increased in severity. The effect of increasing the thickness of the insulation systems increased the buckling value as expected and these results are explained through application of the Euler Column Critical Load Formula.
Date of Award19 Sep 2019
Original languageEnglish
Awarding Institution
  • University Of Strathclyde
SupervisorErkan Oterkus (Supervisor) & Selda Oterkus (Supervisor)

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