Electromagnetic pulse-induced acoustic testing and the pulsed guided wave propagation in composite/metal adhesive bonding specimens

Materials composed of metals and plastic composites joined through adhesive bonding are being increasingly used. However, debonding such materials may occur during manufacture or use. Non-destructive testing structures is required to evaluate their debonding. Herein, electromagnetic pulse-induced acoustic (EPAT) was used detect at the joint in composite/metal specimens. EPAT uses a pulsed excitation current generate guided waves specimen without contact, which makes it suitable for from composite side. Simulations were performed analyze acrylic/aluminum (Al) carbon fiber-reinforced (CFRP)/Al The results showed that Lorentz force z direction dominant mechanism generation waves, mainly A0-mode Lamb wave excited. simulation experimental revealed specimens where mechanical parameters layer differed greatly those metal, as acrylic/Al specimen, could only be detected directly above Therefore, necessary position by scanning receiver sensor. Conversely, with reasonably similar metal layers, like CFRP/Al evaluated sensor coil.