So it seems the tongue is fairly thick and the groove is rather skinny. Thoughts?However, they were conventional in as far as they used a top and bottom section joined by a tongue and grove joint at the waistline (just below the door aperture).
There is no strength in that direction on the core. The tongue is to double the surface area of the bond. Tooth for a bond is kind of misunderstood. You don't need a super rough surface. You do need good surface activation and good surface wetting.gambler wrote:It appears that the "tongue" edges that meet each other are open to the core to allow the glue to get some tooth making the butt part of the joint stronger, maybe?
Hand sanding or abrasive blasting. Time is critical you lose activation as time goes on.hardingfv32 wrote:What is a common way to surface activate epoxy?
Brian
The way I interpret it is that the upper half of the tub has an absence of core about an inch deep along the bottom edge. The bottom half of the tub has excess core extending about an inch along the top edge. The core interlocks between the upper and lower halves to create the joint.flynfrog wrote:I think the difference in thickness is just where one side has the core and the other doesnt.
Yep. there are few ways to get the same or close to the same result. Check out the links I postedReedMann wrote:The way I interpret it is that the upper half of the tub has an absence of core about an inch deep along the bottom edge. The bottom half of the tub has excess core extending about an inch along the top edge. The core interlocks between the upper and lower halves to create the joint.flynfrog wrote:I think the difference in thickness is just where one side has the core and the other doesnt.
Is that what you were getting at?
With a lap joint between composite laminate skins, other factors like ply orientations and ply drops are also important. The relative shear stiffness at the skin and adhesive interface can affect the bond strength. That is why you would design the skin at the joint with a taper and a very thin free edge. The thin free edge of the skin minimizes the tendency of the adhesive bond to peel.flynfrog wrote:There is no strength in that direction on the core. The tongue is to double the surface area of the bond. Tooth for a bond is kind of misunderstood. You don't need a super rough surface. You do need good surface activation and good surface wetting.
