Mechanical Properties of Knock-down Joints in Honeycomb Panels

Abstract

This study focuses on the use of demountable furniture joints in combination with 38-mm-thick honeycomb panels. These fittings were incorporated into L-shaped corner joints and then tested to determine their bending moment capacity. Overall, seven combinations of demountable fittings were tested. These groups of connectors consisted of solution non-glued, partly-glued connectors, and fully-glued connectors. All of the connectors were positioned in the test samples as they are commonly located in furniture construction. The highest capacities were obtained with glued connectors, followed by partly glued and then non-glued connectors. The difference in capacity between the inside and outside positions was insignificant for the non-glued and fullyglued connectors. A large difference between connectors in different positions was found for the partly glued connectors and for the second type of unglued connectors. The modes of failure were analyzed for each connector, and the possibilities for use in construction are described.

Structural Application of Lightweight Panels Made of Waste Cardboard and Beech Veneer

“…The problematic parts of applying paper honeycomb panels as structural elements are the joints [ 11 ]. For this reason, there is a growing industrial and academic interest on the investigation and optimization of these types of joints [ 16 , 34 , 35 , 36 , 37 , 38 ]. Some of the authors studied the bending strength of the joints [ 36 , 38 , 39 ], but tensile and shear tests were applied, as well [ 15 , 34 , 35 , 38 , 39 ].…”

“…For this reason, there is a growing industrial and academic interest on the investigation and optimization of these types of joints [ 16 , 34 , 35 , 36 , 37 , 38 ]. Some of the authors studied the bending strength of the joints [ 36 , 38 , 39 ], but tensile and shear tests were applied, as well [ 15 , 34 , 35 , 38 , 39 ]. Lightweight honeycomb panels with different thicknesses have been tested.…”

Mechanical Properties of Corner Joints Made of Honeycomb Panels with Double Arrow-Shaped Auxetic Cores

“…This tendency is proportional to the number of used fasteners [10,[33][34][35][36][37]; • Influence of distribution of fasteners. For instance, for double dowel joint the most effective dowel distribution equals 96 mm [38][39][40][41][42]; • Influence of fastener/joint geometry on joint stiffness. The increase in fastener length and diameter results in joint strength improvement, although increasing length is more effective [6,36,43,44].…”

“…Influence of distribution of fasteners. For instance, for double dowel joint the most effective dowel distribution equals 96 mm [ 38 , 39 , 40 , 41 , 42 ];…”

“…It has been shown that increasing the values of these parameters results in the deterioration of joint stiffness by 25% and strength by 40%. In Koreny's work [40], the analysis of the strength of honeycomb furniture joints was presented. Some of the fasteners for honeycombs that are available on the market were taken into account.…”