T型加强筋条对弹性导波在薄板中传播行为的影响

Stiffened thin wall panels are often used in aerospace, ship and other equipment structures. When using the elastic guided wave method to detect damages of such structures, it is necessary to deeply understand effects of stiffeners on propagation behavior of elastic guided wave in thin-walled structures. Here, aiming at typical T-stiffened wall panel structure in aircraft structure, the interaction mechanism between ultrasonic guided wave and T-stiffener was studied using the numerical simulation method. Variation characteristics of wave propagation behavior caused by presence of stiffener were analyzed in time domain, frequency one and wave number one, respectively. The results showed that existence of stiffener can cause obvious mode conversion phenomenon of propagating wave in structure; with change of excitation frequency, reflection and transmission behaviors of S0 and A0 mode guided waves change obviously.