论文部分内容阅读
本文采用了一种改进方法对局部损伤复合材料层合板进行了振动分析,将复合材料板中的损伤模拟为局部刚度的削减,并取三个损伤因子来刻画损伤的特性.利用高阶摄动法对其自由振动方程进行求解,主要计算了损伤板的自然振动频率和振动模态.相较于一阶摄动展开法,该方法在计算局部较大损伤问题中具有更高的准确度和敏感度.最后对损伤问题进行了参数研究,分析了不同的损伤因子(包括局部损伤程度、方向、面积大小)对板自由振动频率的影响.该方法为二维板局部损伤检测提供了有效精确的理论依据,并为损伤的定量评价提供了一种思路.
In this paper, an improved method was used to analyze the vibration of the locally damaged composite laminates, and the damage in the composite plate was modeled as the reduction of local stiffness. Three damage factors were used to characterize the damage. Method is used to solve the free vibration equation, which mainly calculates the natural vibration frequency and vibration mode of the damage plate. Compared with the first-order perturbation expansion method, this method has higher accuracy in calculating the larger local damage problem and Sensitivity.Finally, the parameters of damage were studied and the influence of different damage factors (including the degree of local damage, direction and area) on the frequency of free vibration of the plate was analyzed.The method provided effective and accurate The theoretical basis for quantitative evaluation of damage provided a way of thinking.