Compute the shear stresses due to the vertical shear force Vy=20 KN.
We consider a composite wood beam section, see figure (dimensions [mm]).
If we take the material E1 as material of reference, we have:
n21=E2/E1=1.5 and I0=Ix1+n21*Ix2
Max tsy (glue) = max tsy (y=90)=552 kPa
Max tsy (wood E1) = max tsy (y=0)=759 kPa
Reference: A-G Cote. Mécanique des solides déformable. Page 574.