Numerical Analysis of Cross-Sectional Effects During the Magnetic Pulse Disassembly of Laminate Structures

To improve the performances of engineered systems, laminate composite structures are widely used as they offer the best strength-to-weight ratio. However, maintenance and recycling of these structures still remain a challenge. One solution can be to disassemble the layers, without damaging them, so that they can be repaired, reused, or recycled. To do so, impulsive sources such as high pulsed powers are considered. Herein, the influence of transverse or cross-sectional effects on the wave propagation within the laminate and on its disassembly conditions is studied by means of two-dimensional numerical simulations performed on a model assembly using the finite element method. The specimen considered is an aluminum/steel assembly joined along a stripe. Two different modelings of the loading applied to the laminate of increasing complexity are successively considered. First, linear elastodynamic simulations show that transverse effects reduce by around 12% the maximum achievable interfacial tensile stress ratio compared with that predicted by the 1D reference model. Then, weakly coupled eddy current-linear elastodynamic numerical analyses clarify the latter result with an estimation of about 16% with respect to the 1D analytical solution. These results permit the design of experiments serving as a proof of concept of the proposed process.