Determination of the Bonding Strength of Finger Joints Using a New Test Specimen Geometry

Abstract

In this study, a specimen geometry for testing finger joints was developed using finite element simulation and proofed by experimental testing. Six different wood species and three adhesives were used for finger-jointing specimens. With the test specimen geometry, the bonding strength of the finger joints was determined without the usual self-locking of the joint. Under load, the test specimen geometry introduces maximum stress at the beginning of the bond line (adhesive zone). However, the test specimen geometry does not generate a symmetric stress state. The main difficulty here is the flank angle of the finger joint geometry. The wood species and adhesives significantly influenced the performance of the finger joints.

A review of modification methods, joints and self-healing methods of adhesive for aerospace

“…In recent years, many scholars have updated the joint structure to further improve the adhesive performance of joints and expand the scope of application of colloidal connections. Stolze et al 78 used a new type of finger joint, as shown in Figure 5(a) , to investigate the adhesion properties of six different substrates to three different adhesives. However, this joint also does not avoid stress concentration, and the angle and length of the finger joint affect the stress distribution.…”