Author: Gladys Albert
Albert, Gladys, 2024 Development of a Structural Integrity Assessment Methodology for a Steel Surface Tank, Flinders University, College of Science and Engineering
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This project investigated the structural integrity of steel surface tanks, specifically those used for storing hazardous substances, utilising non-destructive testing (NDT) techniques and finite element analysis (FEA). The primary objective is to integrate phased array ultrasonic thickness measurements into comprehensive shell and solid finite element models to evaluate stress distributions, identify critical areas of concern, and ensure compliance with industry standards.
To achieve this, MATLAB code was developed to process the data, create a detailed 3D representation of wall loss, and calculate the tank's fill capacity based on structural integrity. The MATLAB code handles data extraction and conversion, producing visualisations that highlight areas with significant thickness loss. These visualisations aid in assessing the tank's structural health and pinpointing areas that may require maintenance.
The analysis compares the shell finite element model with a solid finite element model to validate the shell model's accuracy and computational efficiency. While the shell model offers computational benefits and is suitable for preliminary assessments, the solid model provides detailed stress and deformation patterns, particularly in regions with significant thickness variations. The use of shell modelling enhances computational efficiency and Compliance assessments is done with calculation of the factor of safety for assessment, making it feasible to analyse the entire structure and account for multiple corrosion sites and structural loading conditions, thereby increasing the reliability of the structural integrity assessment.
The project results underscore the importance of accurate data mapping and the use of advanced modelling techniques for reliable structural assessments. By integrating NDT and FEA, the study provides a framework for guiding maintenance and safety protocols for steel surface tanks, ensuring their longevity and safe operation. The insights gained from this project have the potential to revolutionise the prevention and management of tank failures, significantly benefiting industry partners.
Keywords: Structural Integrity, Steel Surface Tanks, Finite Element Analysis (FEA), Non-Destructive Testing (NDT), Stress Distribution, Corrosion Analysis, Shell Model, Solid Model, Structural Health Monitoring, Safety Compliance, Hazardous Substances Storage
Subject: Engineering thesis
Thesis type: Masters
Completed: 2024
School: College of Science and Engineering
Supervisor: Dr. Stuart Wildy