RT info:eu-repo/semantics/article
T1 Cold Expansion Process with Multiple Balls—Numerical Simulation and Comparison with Single Ball and Tapered Mandrels
A1 Curto Cárdenas, David
A1 Calaf Chica, José
A1 Bravo Díez, Pedro Miguel
A1 Preciado Calzada, Mónica
A1 García Tárrago, María José
K1 Cold expansion
K1 Swaging
K1 Ball
K1 Aeronautical
K1 Simulation
K1 Experimental
K1 Ingeniería civil
K1 Civil engineering
K1 Electrotecnia
K1 Electrical engineering
AB Cold expansion technology is an extended method used in aeronautics to increase fatiguelife of holes and hence extending inspection intervals. During the cold expansion process, a mechanicalmandrel is forced to pass along the hole generating compressive residual hoop stresses. The mostwidely accepted geometry for this mandrel is the tapered one and simpler options like balls havegenerally been rejected based on the non-conforming residual hoop stresses derived from their use.In this investigation a novelty process using multiple balls with incremental interference, insteadof a single one, was simulated. Experimental tests were performed to validate the finite elementmethod (FEM) models and residual hoop stresses from multiple balls simulation were compared withone ball and tapered mandrel simulations. Results showed that the use of three incremental ballssignificantly reduced the magnitude of non-conforming residual hoop stresses and the extension ofthese detrimental zone.
PB MDPI
YR 2020
FD 2020-12
LK http://hdl.handle.net/10259/8300
UL http://hdl.handle.net/10259/8300
LA eng
DS Repositorio Institucional de la Universidad de Burgos
RD 11-dic-2024