在本篇研究中，針對複合材料薄壁構件箱型樑受彎矩及軸力載重下的情況，使用一套非線性破壞分析模式，進行材料的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、2.預測破壞時機的混合破壞準則、3.後破壞分析模式。
複合材料薄壁構件箱型樑破壞前的非線性行為模擬，均假設纖維複合材料單層板在軸向(纖維)及側向(基材)均為彈性－塑性行為，而面內剪力使用定值剪力參數來模擬之。對於破壞時機的預測及判斷，結合了Tsai-Wu破壞準則和最大應力準則的優點，稱為混合破壞準則。在後破壞行為分析中，對複合材料單層板軸向、側向和剪力方向之行為均假設成脆性破壞模式。
對於非線性破壞分析模式所預測之結果，將與複合材料薄壁構件箱型樑受集中力作用產生彎矩下之實驗數據結果做比較，以驗證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，延伸探討複合材料薄壁構件箱型樑受彎矩及軸力作用下，在不同長度、斷面尺寸、疊序和彎矩結合軸力之間的交互影響關係，進而作出歸納和討論以期能應用在實務上。

A nonlinear failure mode had been used for studying and predicting
material failure under the condition of thin-walled composite box beam and subjected to combined bending and axial force. 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 analysis of post failure mode.
The simulation of nonlinear mode before failure for the thin-walled composite box beam 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 judge failure timing. During analyzing of post failure mode for the thin-walled composite box beam, the brittle failure mode had been adopted in axial, shear and transverse direction.
The result of the nonlinear failure mode will compare with the experimental data of thin-walled composite box beam subjected to bending to verify the mode in this study correct.
Finally, using the models in this study discuss the thin-walled composite box beam under the different length, section size, order of laminates, and bending-axial forces to apply in engineering.

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