Improving the Glued Joint Strength by Modifying the Beechwood (Fagus sylvatica L) with Gamma Rays

The reserach was done on the effects of gama rays on the change of the critical surface energy γc, work of adhesion Wa, penetration Wp, spreading Ws, and the change of the glued joint strength in beechwood. The samples absorbed the irradiated dosages of 25,50 and 100 kGy, which was followed by measurements of the wetting angle. The surface parameters were calculated from the wetting angle and the surface tension of the liquid. The results show the increase of all observed parameters with an increased dose of radiation. The glued joint strength did not significantly change at low absorbed irradiated dosages of 25 and 50 kGy, but at 100 kGy, the increase in shear strength of the glued joint was considerable.