Numerical investigation on the effects of circuit parameters on the plastic deformation of fastener holes in thin aluminum alloy via electromagnetic expansion process

The size of the plastic deformation zone caused by fastener hole strengthening is a critical indicator performance. In this study, 2A12-T4 aluminum alloy specimens with diameter 6 mm and thickness 1.5 were strengthened Lorentz force through electromagnetic method. numerical results show that can introduce tensile stress in both hoop radial directions specimen during process produce high compressive residual around holes without serious axial compared conventional cold expansion process. simulation are experimentally validated grid method verifying strain, fatigue life be improved several times after strengthening. Furthermore, under same discharge energy, there an optimal capacitance 40 μF work to achieve maximum zone. addition, larger crowbar resistance cause stronger inward unloading result lower stress; therefore, should as small possible.