本研究使用一套非線性破壞分析模式，針對複合材料圓柱殼受扭力載重，進行材料之破壞預測及分析探討。此非線性破壞分析模式主要包含三部分：1.材料破壞前的非線性組成律2.預測破壞時機的混合破壞準則3.後破壞分析模式。
至於纖維複材單層板破壞前之非線性行為模擬，乃假設材料在軸向及側向均為彈性－塑性行為，而面內剪力則使用定值剪力參數來模擬之。然而破壞時機之判斷依據，則使用混合破壞準則: 結合了Tsai-Wu破壞準則和最大應力準則的優點。在後破壞行為分析中，對單層板軸向和剪力之行為均假設成脆性破壞模式，而側向則採用逐降模式模擬之。
對於非線性破壞分析模式所預測之結果，將與複合材料圓柱殼受扭力作用下之實驗數據結果做比較，以證明本論文所建議之分析模式正確且合理。
最後，利用所建立之模型，延伸探討複合材料圓柱殼的邊界條件、不同長/半徑比、疊序、疊層厚度和扭力軸力之間的交互關係，以期能應用於實務上。

A nonlinear failure had been used for studying and predicting material failure under the condition of composite laminated cylindrical shells subjected to combined axial force and torsion. This nonlinear failure mode including three parts: first, the nonlinear constitutive law of material before failure; second, the mixed failure criterion to predict the time of failure; third, the analyses of post failure mode.
The simulation of nonlinear mode before failure for the composite laminated cylindrical shells is assumed that lamina is plastic-elastic in axial and transverse directions, and using constant shear parameter in in-plane. The mixed failure criterion, combining the excellence of Tsai-Wu theory and maximum stress theory, had been used for judging failure timimg. During analyzing of post failure mode for the composite laminated cylindrical shells, the brittle failure mode had been adopted in axial and shear direction, and degrading mode in transverse direction.
The result of the nonlinear failure mode will compare with the experimental data of composite laminated cylindrical shells subjected to torsion to verify the mode in this study correct.
Finally, using the models in this study discuss the composite laminated cylindrical shells under the different boundary conditions, ratio of length to radius, order of laminates, thickness of laminates, and torsion-axial forces to apply in engineering.

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