Development of a Structural Fatigue Life Assessment Framework for High-Performance Naval Ships
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Development of a Structural Fatigue Life Assessment Framework for High-Performance Naval Ships by Teresa Magoga, BEng (Aerospace) National Centre for Maritime Engineering and Hydrodynamics Australian Maritime College Submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy University of Tasmania March 2019 [Page intentionally left blank] Declarations Authority of Access The Commonwealth of Australia holds copyright of the papers comprising Chapters 2 and 4 to 8. Access to the material should be sought from the respective journals. The remaining non- published content of this thesis may be made available for loan and limited copying and communication in accordance with the Australian Copyright Act 1968. Declaration of Originality This thesis contains no material which has been accepted for a degree or diploma by the University or any other institution, except by way of background information and duly acknowledged in the thesis, and to the best of my knowledge and belief no material previously published or written by another person except where due acknowledgement is made in the text of the thesis, nor does the thesis contain any material that infringes copyright. Signed: ______ Date: _____29/3/2019____ i Statement of Co-authorship The following people and institutions contributed to the publication of work undertaken as part of this thesis: Australian Maritime College, University of Tasmania; Candidate: Ms Teresa Magoga Defence Science and Technology Group, Department of Defence, Australia Author 1: Dr Roberto Ojeda Australian Maritime College, University of Tasmania Australian Maritime College, University of Tasmania; Author 2: Dr Stuart Cannon Defence Science and Technology Group, Department of Defence, Australia Author 3: Prof Giles Thomas University College London Defence Science and Technology Group, Department Author 4: Dr Seref Aksu of Defence, Australia Defence Science and Technology Group, Department Author 5: Mr Karl Slater of Defence, Australia Mr Joshua Dawes- Author 6: QinetiQ Australia Lynch Defence Science and Technology Group, Department Author 7: Mr Michael Brincat of Defence, Australia Defence Science and Technology Group, Department Author 8: Mr Dylan Dwyer of Defence, Australia Defence Science and Technology Group, Department Author 9: Mr Brett Morris of Defence, Australia As part of this PhD investigation, the Candidate and the aforementioned authors produced peer-reviewed publications. The individual contributions to the work undertaken for each publication are detailed below: ii 1. Magoga, T., Aksu, S., Cannon, S., Ojeda, R., and Thomas, G., The Need for Fatigue Life Prediction Methods Tailored to High-Speed Craft: A Technical Review, in Pacific 2015 International Maritime Conference. 2015: Sydney, Australia. The first publication is a conference paper that consists of a partial literature review that is also presented within Chapter 2 of the thesis. The Candidate was lead author and contributed 80% to the planning and execution of the research and resulting paper. Authors 1, 2, 3, and 4 contributed 5% each to the interpretation of the work and critical revision of the paper. 2. Magoga, T., Aksu, S., and Slater, K., Proposed Implementation of Nominal Stress Approach for Fatigue Assessment of Aluminium Naval Ship Welded Details. Part M: Journal of Engineering for the Maritime Environment, submitted for publication. The second publication is presented within Chapter 4 of the thesis. The Candidate was lead author and contributed 85% to the planning and execution of the research and resulting paper. Authors 4 and 5 contributed 10% and 5%, respectively, to the interpretation of the work and critical revision of the paper. 3. Magoga, T., Aksu, S., Cannon, S., Ojeda, R., and Thomas, G., Identification of Slam Events Experienced by a High-Speed Craft. Ocean Engineering, 2017. 140: p. 309-321. The third publication is presented within Chapter 5 of the thesis. The Candidate was lead author and contributed 80% to the planning and execution of the research and resulting paper. Authors 1, 2, 3, and 4 contributed 5% each to the interpretation of the work and critical revision of the paper. 4. Magoga, T., Aksu, S., Cannon, S., Ojeda, R., and Thomas, G., Comparison between Fatigue Life Values Calculated Using Standardised and Measured Stress Spectra of a Naval High Speed Light Craft, in 13th International Symposium on the Practical Design of Ships and Other Floating Structures. 2016: Copenhagen, Denmark. The fourth publication is presented within Chapter 6 of the thesis. The Candidate was lead author and contributed 80% to the planning and execution of the research and resulting paper. iii Authors 1, 2, 3, and 4 contributed 5% each to the interpretation of the work and critical revision of the paper. 5. Magoga, T., Fatigue Damage Sensitivity Analysis of a Naval High Speed Light Craft via Spectral Fatigue Analysis. Ships and Offshore Structures, submitted for publication. The fifth publication is presented within Chapter 7 of the thesis. The Candidate was sole author of this paper. 6. Magoga, T., Aksu, S., Cannon, S., Ojeda, R., and Thomas, G., Through-Life Hybrid Fatigue Assessment of Naval Ships. Ships and Offshore Structures, published online 2019. The sixth publication is presented within Chapter 8 of the thesis. The Candidate was lead author and contributed 80% to the planning and execution of the research and resulting paper. Authors 1, 2, 3, and 4 contributed 5% each to the interpretation of the work and critical revision of the paper. 7. Magoga, T., Trials and Tribulations: Load and Structural Response Measurements of a Naval Semi-Planing Craft, in Pacific 2017 International Maritime Conference. 2017, Sydney, Australia. The seventh publication is presented within Appendix A of this thesis. The Candidate was sole author of this paper. 8. Dawes-Lynch, J. and Magoga, T., HMAS Maryborough Hull Monitoring System: Data Processing and Analysis Methods. 2017, Defence Science and Technology Group: Melbourne, Australia. The eighth publication is presented within Appendix B of the thesis. The Candidate and Author 6 each contributed 50% to the report. iv 9. Magoga, T., Brincat, M., and Dawes-Lynch, J., Verification of Pressure Sensors and Strain Gauges Installed Onboard HMAS Maryborough. 2016, Defence Science and Technology Group: Melbourne, Australia. The ninth publication is presented within Appendix C of the thesis. The Candidate, Author 6, and Author 7 each contributed one third to the report. 10. Magoga, T. and Dwyer, D., Fatigue Life as a Variable in Assessing Naval Ship Flexibility. Naval Engineers Journal, 2018. 130(3). The tenth publication is presented within Appendix D of the thesis. The Candidate was lead author of this paper and contributed 60% to the planning and execution of the research and resulting paper, and the interpretation of the work. Author 8 contributed 40% to the planning and execution of the research and resulting paper, and the interpretation of the work. 11. Magoga, T. and Morris, B., An Investigation into RAN Ship Structural Life-of-Type Management without Hull Monitoring Systems. In review, DST-Group-TN-1826, Defence Science and Technology Group: Melbourne, Australia. The eleventh publication is also presented within Appendix E of the thesis. The Candidate and Author 9 each contributed 50% to the report. v We the undersigned agree with the above stated ‘proportion of the work undertaken’ for each of the above publications that contribute to the thesis. Signed: Date: ______ Signed: _ Date: ______ Dr Roberto Ojeda Prof Shuhong Chai Primary Supervisor Head of School National Centre for Maritime National Centre for Maritime Engineering & Hydrodynamics Engineering & Hydrodynamics Australian Maritime College Australian Maritime College University of Tasmania University of Tasmania vi Acknowledgements My mum Faye Magoga and late dad Giordano Magoga taught me the value of hard-work. My sisters Angela and Lisa Magoga help me keep a sense of humour. My partner Johannes Straub is my rock. I am grateful to Dr Roberto Ojeda, Dr Stuart Cannon, Prof Giles Thomas, and Dr Seref Aksu for their assistance during my candidature. I am also grateful to my colleagues from the Defence Science and Technology Group for their various contributions, from reviewing papers, showing me how to shunt-calibrate a strain gauge, and being a sounding board for my ideas and questions. My PhD was supported by the Australian Defence Organisation. This research would not have been possible without the cooperation of the Royal Australian Navy and the Patrol Boat Program Systems Office. vii Abstract Navies around the world have been using High Speed Light Craft (HSLC) in a wider range of military roles and ocean environments than ever before. This increasing range of operations, use of lightweight scantlings, and susceptibility to slamming necessitates the development of improved structural fatigue assessment methods. These improved methods are required to ensure that a HSLC will meet its intended life, and to evaluate the impact of through-life modifications to the structure or operational profile. This PhD thesis covers the development of an efficient structural fatigue life assessment framework for high-performance naval ships. The framework helps to inform risks through-life for decision-makers, by integrating real-world data and optimised tool selection. The thesis begins with a critical review of available approaches to fatigue assessment and their associated merits and limitations when