Groove stiffening of sheets by single point incremental forming

Abstract

This paper investigates the applicability of single point incremental forming to fabricate stiffening grooves in thin metallic panels. The work combines experimentation, finite element and analytical modelling to determine the required forces and the maximum allowable groove depths that can be produced without tearing. The analytical modelling is based on a framework that was previously developed by the authors and combines in-plane membrane stretching and fracture forming limits. Comparison of the results obtained by the analytical framework against experimental and finite element data proves its effectiveness to replicate the deformation mechanics of groove stiffening by single point incremental forming. Results also prove that groove stiffening by single point incremental forming is an easy and effective alternative to conventional reinforcement of thin metallic panels by welding or fastening of stringers.

Investigation of the flat clinch–rivet process with different blank holder structures

“…2,3 Advanced forming technology is the basic guarantee that these lightweight materials can be applied. 4 The techniques often considered for joining lightweight sheets in the industry include welding, adhesive bonding, and self-piercing riveting. [5][6][7][8] Welding is a process of joining metals or other thermoplastic materials at high temperatures or pressure.…”

“…2,3 Advanced forming technology is the basic guarantee that these lightweight materials can be applied. 4…”