本研究以有限單元軟體ANSYS，模擬分析碳纖維/環氧樹脂(Graphite/Epoxy)複合材料壓力容器。本研究探討碳纖維/環氧樹脂壓力容器在壓縮天然氣(Compressed Natural Gas, CNG)使用規範之操作壓力下，搭配田口法(Taguchi Method)直交表分析及設計9組壓力容器模型，以四種因子及各三種水準，因子包括殼體厚度與壓力容器半徑比、端板開口半徑與壓力容器半徑比、碳纖維/環氧樹脂之疊層排列，及筒體長度與壓力容器半徑比。
為探討9組壓力容器模型結構位移、應力分佈影響程度，並比較壓力容器最大位移、端板及筒體交界處之蔡希爾失效值，使用田口望小型方法分析其蔡希爾失效值之田口信噪比(S/N Ratio)，討論控制因子對壓力容器結構之程度。當壓力容器厚度越厚，或疊層排列為交叉疊層[(0/90)S]n，或筒體越短或為球型結構時，抑制壓力容器之位移效果最佳；當壓力容器之筒體及端板交界處或兩端板交界處為環狀拘束時，類均向(Quasi-Isotropic)疊層[(0/60/-60)S]n為最佳水準；若其為自由膨脹邊界時，球型結構為最佳水準，而疊層排列之影響較不明顯。
對具有筒體結構之壓力容器可以高模數高密度聚乙烯包覆減緩內層纖維角0度應力及蔡希爾失效值，討論以整體及局部包覆筒體中心部分；在端板與交界處為環狀拘束時，局部高模數高密度聚乙烯包覆可明顯抑制筒體應力，而以整體包覆筒體部分有失效風險。
此外，對9種壓力容器模型模態分析，以田口望大型方法分析其第一模態頻率之田口S/N比，比較造成低頻影響之程度控制因子。當筒體越短或球型結構時較利於高頻設計，疊層排列為交叉疊層時較不利於高頻設計。

The stress analysis of graphite/epoxy composite pressure vessel was carried out using finite element software ANSYS. The Taguchi method was used to investigate the deformation and failure of the graphite/epoxy composite pressure vessel. Four factors, including thickness-vessel radius ratio, end plate opening radius-vessel radius ratio, lamination stacking and cylinder length-vessel radius ratio, with three levels by orthogonal array of Taguchi method to make total nine analysis models are studied in this study.
The Tsai-Hill failure criterion value at the junction of semispherical part was considered as the S/N ratio for the smaller better value of Taguchi method. For thicker pressure vessel, the stacking [(0/90)S]n, or shorter cylindrical part, the deformation of composite pressure vessel is smaller. When the two junctions of semispherical parts are clamped, the vessel with quasi-isotropic [(0/60/-60)S]n lamination has the smallest deformation; while under free boundary condition, the smallest deformation occurs for the spherical pressure vessel and the effect of lamination stacking is not obvious.
The pressure vessel covered by a high density polyethylene layer with total or a central half lengths can reduce the stress in the composite pressure vessel. The Tsai-Hill failure criterion for the 0 degree inner layer was discussed. In addition, the fundamental frequency of the composite pressure vessel, considered as the S/N ratio for the larger better value of Taguchi method, was evaluated for the nine models. It is concluded that a vessel with shorter cylinder is better, while a vessel with cross ply lamination is unfavorable, for the high-frequency design.

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