Reliability Analysis Of Composite Overwrapped Pressure Vessel On The Boundary-layer Theory

Composite Overwrapped Pressure Vessel (COPV) is widely used in aerospace, marine engineering and various civil applications due to their exceptionally high specific strength and specific module, good high-temperature resistance, corrosion resistance and so on. Development and improve the reliability of design theory and methods of COPV are extremely important theoretical and engineering significance for achieving the high goals of improving the structural performance-prices rate and loss weight in space and civilian areas. However, the reliability of composite materials engineering design theory is not yet perfect.The outline of this thesis is as follows:Firstly, Based on the Classical theory of Laminated and the Network Theory, this thesis gets the macro-mechanical analysis of composite pressure vessels. The boundary-layer Theory is successfully combined with the Classical theory of Laminated, which gives a more reasonable answer to generalized internal forces and strain. Secondly, this thesis overviews the development of the reliability of project design theory and methods, introduces the method of the advanced first order second moment method and Monte-Carlo. Finally, this thesis outlines the strength rules of composite materials, calculates the stress fields of unidirectional fiber with the application of stress distribution matrix method, establishes the limit state equation based on Tsai-Wu Strength Criteria, and completes the reliability analysis of COPV.The procedures of the above-mentioned sub-blocks are completed by using the MATLAB software, and examples are given to verify them. Finally, the flow chart of reliability analysis of COPV is given, and the reliability of a true COPV model is analyzed.