Lamb wave propagation in a composite cracked beam based on spectral finite element method
SUN Hu, ZHOU Li
MOE Key Lab of Structures Mechanics and Control for Aircraft, Institute of Structures & Strength, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract:Abstract: A spring element, based on spectral finite element method, is proposed to model axial-flexural motion due to a transverse crack and model Lamb wave propagation in a composite beam. According to fractural mechanics, stiffness of the spring is obtained and used to establish the damaged spectral finite element model for the composite cracked beam. Compared with results from the conventional finite element method, the proposed model is verified to be effective and efficient to model Lamb wave propagation in composite cracked beams. Formulations for calculating Lamb wave energy are derived in the frequency domain, and energy conservation at the crack location validates the proposed model. It is indicated that energy of Lamb wave modes versus the crack depth is monotonous, which may supply some practical foundations for quantitative crack identification in composite beams.
孙 虎;周 丽. 基于谱元法的复合材料裂纹梁Lamb波传播特性研究[J]. , 2012, 31(14): 112-116.
SUN Hu;ZHOU Li. Lamb wave propagation in a composite cracked beam based on spectral finite element method. , 2012, 31(14): 112-116.