【摘要】 结构在建造和服役期间将不可避免出现损伤,发展合适的无损检测方法对其进行检测具有广泛的工程应用价值.基于多自由度振动力学和连续体损伤理论,发展了应变模态法损伤检测理论.通过预置损伤复合材料层合梁的动态加载试验,测得各个测点的应变时程响应,然后利用MATLAB编程对数据进行处理,从而得到结构的损伤应变模态曲线.数据处理结果精确反映了预置结构损伤的位置,由此证明了应变模态法能够应用于复合材料层合梁的损伤定位.最后基于有限元软件ABAQUS,利用连续体损伤理论对损伤纤维金属层合梁的模态进行分析,更进一步验证了当前应变模态法对损伤层合的损伤定位的可靠性.更多还原

【Abstract】 Micro-damage is always unavoidably incurred in structure in fabrication and serving performance.It is of high value to develop an undamaged detection method for these structures.Based on the multi-DOF vibration of mechanics and continuum damage theory,strain-mode based undamaged detection method was discussed and applied in the undamaged detection of composite beam.The strain response of the damaged laminated composite beam at different tested points was obtained through the dynamic test of the structures.And the strain-model curves of the damage structures was acquired by dealing with the dates with the MATLAB programs.The result indicates the exact position of the damage in the structure,which proves the validity of the strain-model method on the damage detection of the laminated composite structure.At last,the model analysis was conducted by applying continuum damage theory based on finite element software ABAQUS,which further demonstrates the feasibility and reliability of the strain-mode method in predicting the damage of structure.更多还原