Interaction of Lamb mode (A(o)) with structural discontinuity and generation of "Turning modes" in a T-joint.
In the present work, the interaction of the fundamental anti-symmetric guided Lamb mode (A(o)) with a structural discontinuity in a composite structure was studied through Finite Element numerical simulations and experiments. The structural component selected for this study was a T-joint section made from glass/epoxy material. This co-cured composite structure is made-up of an upper shell (skin) and a spar as the sub-components. It was observed that when A(o) mode interacts with the junction (structural discontinuity) of these sub-components, a mode-converted S(o) mode is generated. Experiments were conducted using air-coupled ultrasound to validate the numerical simulations. The back-propagating "Turning modes", which propagate from the thin region to the spar web and vice versa, were also numerically simulated and experimentally verified.
Composite Research Center, R & D E (E), Dighi, Pune 411 015, India.
C
C
Ramadas
Krishnan
K
Balasubramaniam
M
M
Joshi
C V
CV
Krishnamurthy
D003198:Computer Simulation; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008420:Manufactured Materials; D008422:Materials Testing / Q000379:methods*; D008962:Models, Theoretical; D012542:Scattering, Radiation; D014463:Ultrasonography / Q000379:methods*