层状复合材料周期结构的超声传播频散特性及均匀化模拟  

Ultrasonic Dispersion and Structure Homogenization Simulation of Layered Periodic Structures Composites

作　　者：常新龙[1] 尼涛[1] 艾春安[1] 刘瑜[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《无损检测》2010年第10期780-784,共5页Nondestructive Testing

摘　　要：首先采用改进全局矩阵算法,研究了层状复合材料周期结构的频散特性。当层数足够大时,在特定方向上结构表现出类似均匀各向异性材料的性质,可采用均匀化方法求解频散曲线。其次,给出了层状复合材料周期结构均匀化的计算方法,并研究了其适用范围。发现在低频段和高频高相速度段范围内可以采用等效模量计算频散特性;而高频低相速度范围内不能采用均匀化方法,该范围内波的性质有待进一步研究。The dispersive property of layered periodic composites structure was researched by improved global matrix approach, firstly. It was found that the structure represented characterization of the homogenous anisotropie materials when the number of layer was large enough. Then the effective modules algorithm was developed and its applicability was discussed. The effective modules could be accepted in two ranges including the lower frequency band as well as the higher frequency and phase velocity band. However, the dispersive curves could not be calculated using effective modules in situation of higher frequency band with lower phase velocity below the longitudinal wave velocity, and the characterization of waves needed further investigation.

关 键 词：层状周期结构 复合材料 全局矩阵 等效模量 

分 类 号：TG115.28[金属学及工艺—物理冶金]