失圓效應對於圓筒型壓力殼降伏強度之影響研究

The Study for the out-of-round Effects on Yielding Strength Analysis of the Cylindrical Pressure Hull

壓力殼為潛艦最重要的抗壓結構，而圓度效應在壓力殼強度分析中佔有重要之地位；本論文之主要目的是研究圓度效應對圓筒型壓力殼降伏強度弱化之影響，首先針對歐美壓力容器圓度規範進行探討，利用以有限單元法軟體系統ABAQUS為工具，建構理想壓力殼模型及以失圓率為參數之一系列壓力殼失圓模型（失圓率ψ=0.1%-8%），考量承受靜水壓負荷時，以von Mises應力作為降伏判據，以進行最大下潛深度計算及殼體變形分析，研究成果確立失圓率為壓力殼圓度效應重要影響參數，此可提供壓力殼結構設計者進行壓力殼設計時參考使用。 The pressure hull is the most important structure of the submarine to resist the hydrostatic pressure load, while the circularity effects of the pressure hull perform an important role in the strength analysis for pressure hull structure. The main purpose of this paper is to study the influence on the yielding strength of the pressure hull weakened owing to the circularity effects on the pressure hull. The work studied the specification of the pressure vessel of the various countries in Europe and American about the circularity effects of the pressure hull. The cylindrical pressure hull would be used as an object of the investigation to probe influence of circularity effect on the yielding strength reduction of the pressure hull. The ABAQUS based on FEM would used to set up the circular effect analysis tool. This paper established the ideal model and a series of circularity imperfection models (out-of-round ratio ψ=0.1%-8%) and used the von Mises stress as the yielding criterion to calculate the maximum diving depth and the deformation of the cylinder under hydrostatic loading. The results show the out-of-round ratio is the important factor of the pressure hull and can be provided the submarine pressure hull structure designer with an effective tool at design stage.