| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 96 === 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 torsion 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 torsion, axial force and bending load 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 boundary conditions, length, section size, order of laminates, and torsion-axial forces to apply in engineering.
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