Joining by forming of metal–polymer sandwich composite panels

Pragana J.P.M.; Contreiras T.R.M.; Bragança I.M.F.; Silva C.M.A.; Alves L.M.; Martins P.A.F.

Key information

Authors:

Pragana J.P.M. (João Pedro da Fonseca Matos Pragana); Contreiras T.R.M. (Carlos Manuel Alves da Silva); Bragança I.M.F. (Ivo Manuel Ferreira de Bragança); Silva C.M.A. (Luís Manuel Mendonça Alves); Alves L.M. (Tomás Rocha Mota Martins Contreiras); Martins P.A.F. (Paulo António Firme Martins)

Published in

08/01/2019

Abstract

This article presents new joining-by-forming processes to assemble longitudinally two metal–polymer sandwich composite panels perpendicular to one another. Process design draws from an earlier development of the authors for metal sheets to new concepts based on the combination of sheet-bulk forming with mortise-and-tenon joints. Selected examples obtained from experimentation and finite element modelling give support to the presentation. A new three-stage joining by the forming process is capable of producing mechanically locked joints with larger and stiffer flat-shaped heads than those fabricated by alternative single- or two-stage solutions. Failure in the new three-stage joining by the forming process is found to take place by cracking instead of disassembling after unbending the flat-shaped head of the joint back to its original shape. The required forming forces to produce the new metal–polymer joints are below 15 kN, allowing them to be an effective, easy-to-implement alternative to existing solutions based on adhesive bonding, welding and mechanical fastening.