Classification of solutions for guided waves in anisotropic composites with large numbers of layers.
Classification of solutions for guided waves in anisotropic composites with large numbers of layers.
复制标题
具有大量层的各向异性复合材料中导波解的分类。
DOI：
10.1121/1.5082299
复制
发表时间：
2018
影响因子：
2.4
通讯作者：
M. Sause
中科院分区：
文献类型：
--
作者：
Armin M A Huber;M. Sause
导波用于汽车和航空航天工业的无损评价。从各向同性材料转向基于复合材料的制造是一种趋势。然而，这种材料中的弹性波动动力学要复杂得多。对于复合材料中导波色散曲线的计算，人们做了大量的工作。有很多方法和工具可用，但是当层数超过100层时就变得困难了。本文演示了用刚度矩阵法计算色散图和模态振型的方法。在刚度矩阵法中实现了边界条件，允许对各种模态族进行单独跟踪。剪切水平模态采用传递矩阵法进行建模，不存在数值失稳问题。阐明了模族的出现取决于系统的对称性和波的传播方向。提高了刚度法导波建模的鲁棒性和可靠性，获得了更多的模态信息。这在纤维增强聚合物T800/913的示例层中得到了证明，其层数高达400层。参考所选病例的分散®（伦敦帝国理工学院，英国伦敦）的结果。
Guided waves are used for the non-destructive evaluation in automotive and aerospace industries. There is a trend leaning away from isotropic materials to the manufacturing based on composites. However, the elastic wave dynamics in such materials is considerably more complicated. Much effort has been committed to the calculation of guided waves' dispersion curves in composites. Lots of methods and tools are available, but it becomes difficult when there are more than one hundred layers. In this paper the calculation of dispersion diagrams and mode shapes using the stiffness matrix method is demonstrated. Boundary conditions are implemented into the stiffness matrix method that allow for the separate tracing of the various mode families. Shear horizontal modes are modeled with the transfer matrix method without facing any numerical instability. It is elucidated just how the occurrence of the mode families depends on the system's symmetry and wave propagation direction. As a result, the robustness and reliability of guided wave modeling by using the stiffness method is improved, and more information about the modes is yielded. This is demonstrated on exemplary layups of the fiber reinforced polymer T800/913, with up to 400 layers. Referencing is made against results from DISPERSE® (Imperial College London, London, UK) for selected cases.