Static and dynamic tensile shear test of glued lap wooden joint with four different types of adhesives.

Investigations of quasi-static and fatigue failure
in glued wooden joints subjected to tensile shear loading
are presented. Lap joints of beech wood (Fagus sylvatica
L.) connected with four different types of adhesives, i.e.
polyurethane (PUR), melamine urea formaldehyde (MUF),
bone glue and fish glue, were experimentally tested
until the specimens failed. The average shear strengths
obtained from the quasi-static test ranged from 12.2 to
13.4 MPa. These results do not indicate any influence of
the different adhesive types. The influence of the adhesives
is only visible from the results of the fatigue tests,
which were carried out under different stress excitation
levels between 45% and 75% of the shear strength. Specimens
bound with ductile adhesive (PUR) showed a slightly
higher number of cycles to failure (Nf) at low-stress levels
and lower Nf at high-stress levels in comparison to more
brittle adhesives (MUF, fish glue). In general, the performances
of animal glues and MUF were similar in both
quasi-static and fatigue loading under dry conditions.
Keywords: bone glue, fatigue test, fish glue, glued wood
lap joint, melamine urea formaldehyde (MUF), polyurethane
(PUR), tensile shear test