Mechanical Properties of a Metal Sandwich Panel Manufactured Using Longitudinally Laminated Forming Tools

Abstract

Sandwich panel structures are increasingly used in applications where the most important demands are the weight saving and long service life. Utilizing sandwich panels, extremely light-weight, stiff and robust structures can be manufactured. In this study, sandwich panels were produced by specially designed cost-effective forming tools. Various kind of test materials were used for corrugated cores and skin plates: conventional low-carbon steel grade EN 10130 and ferritic stainless steel grade 1.4509 with plate thicknesses of 0.6 and 0.75 mm. A common S355 structural steel was used as a reference for bending strength comparison.For measuring the stiffness, MTS tensile and fatigue testing machine was selected to determine the bending resistance of the sandwich panels. The bending force, needed for yielding and fracture, related to the bending length and intensity was compared with the results from bending of the reference plates. Results showed that the bending force of the panels is significantly higher than that of a plate having similar intensity. The best results were obtained with the stainless steel (SS) panel that had 27% higher bending force at the yield point than 5 mm thick S355 plate having 3 times larger intensity. The carbon steel panel was approximately 40% weaker than the SS-panel and both panel types lost strength when loading direction was changed from transverse to 45 degree and further to 90 degree load (longitudinal).

Bending Strength of Laser-Welded Sandwich Steel Panels of Ultra-High Strength Steel

“…The corrugated core and Vf-core types are very similar designs, both being V-type cores [2], but the continuous corrugated core is made from single sheet and Vf-cores are individual parts. The overall stiffness of the corrugated core panels and Vf-core panels in the transversal loading direction is very good, however in the longitudinal loading direction stiffness of the panels is weaker [4,[9][10][11][12].…”

“…One potential solution for the next generation light-weight structure is the transition from conventional sheet structures to sandwich panel structures [1]. Sandwich panels have a good stiffness to weight ratio, offering a weight saving potential of up to 50% as compared to traditional sheet steel structure [2,3,4,5]. Due to the high yield strength of the ultra-high-strength UHS steel, the sheet thickness can be reduced without losing the bending strength of the structure [6,7].…”

Joint Mechanisms of the Collar-Connection-Element

“…BESSE uses a stamping process for manufacturing a corrugated core layer [4]. LÄMSÄ [5] and JÄRVENPÄÄ [6] use a press brake process to produce a corrugated core. All approaches have a metallurgical bond creation in common.…”

Mechanical Properties of a “Simple Panel Structure” Manufactured of an Ultra High Strength Stainless Steel

“…Mechanical properties of different kinds of sandwich panels have been compared and a conclusion drawn that the strength performance of the honeycomb-core sandwich panel is the best [4]. The mechanical properties of the steel-based sandwich panel can be effectively enhanced by utilizing a steel grade with either higher yield strength or strain hardening capability [5]. The influence of the loading direction is, however, higher with the increased yield strength of panel material [5].…”

“…The mechanical properties of the steel-based sandwich panel can be effectively enhanced by utilizing a steel grade with either higher yield strength or strain hardening capability [5]. The influence of the loading direction is, however, higher with the increased yield strength of panel material [5]. Because the elastic modulus is practically constant among steel grades, the structural stiffness must be optimized by geometrical optimization respecting the manufacturing aspects [6].…”