摘要
为了更有效地使用超声技术检测各向异性管道中纵向缺陷,采用正交多项式级数的方法计算了正交各向异性均匀无限长管道中的周向导波的频散曲线,并通过有限元模拟验证了前两阶模态的群速度．根据对群速度频散曲线和位移分布的分析,找出了适合各向异性圆柱板中纵向缺陷检测的频率及模态,通过有限元模拟实现了纵向缺陷的检测及定位．
In order to inspect longitudinal cracks of anisotropic pipes more efficiently, guided circumterential waves in infinitely long orthotropic hollow cylinders are studied by an orthogonal polynomial approach. The formulation is based on linear three-dimensional elasticity. Results are compared with the finite element simulation to check up the accuracy and range of applicability of this polynomial approach. The group velocity dispersion curves and displacements distributions of guided circumferential waves for orthotropic cylindrical curved plate are calculated and appropriate frequency and modes that can be used to detect a longitudinal defect are found. Finally, finite element methods are used to simulate the detection and location of a longitudinal defect.
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2007年第6期567-571,共5页
Journal of Beijing University of Technology
基金
国家自然科学基金(10602004)
北京市自然科学基金项目(8062008)
关键词
正交各向异性
导波
正交多项式
超声检测
有限元方法
orthotropy
guided waves
orthogonal polynomial
ultrasonic measurement
finite element method
