DaveD
Well-Known Member
This is a topic that has been touched on a few times but I'd like to try and gather a general consensus of opinion (or just stir up some general disagreement :gig
As far as I can tell typical approaches to concentrated attachment loads in composites are:
Solid Laminate
Plywood inserts
Metal inserts
Strip out foam between skins and inject epoxy-flox mixture.
Plus combinations of the above... If anyone knows of any others I'd love to hear them.
I've been thinking about how you'd go about analysing these? For an insert I suppose you can caluclate the bearing strength of the insert and then work out what the surface area of the insert needs to be in contact with the skin to meet the shear strength requirment? I'm not sure how I'd approach pull out strength though... For the flox injection method I guess I may just have to make some test samples and destructively test them (Hey, who doesn't love breaking stuff!!...) unless there's some existing data out there for bearing strength of flox-epoxy?
Cheers
Dave
As far as I can tell typical approaches to concentrated attachment loads in composites are:
Solid Laminate
Plywood inserts
Metal inserts
Strip out foam between skins and inject epoxy-flox mixture.
Plus combinations of the above... If anyone knows of any others I'd love to hear them.
I've been thinking about how you'd go about analysing these? For an insert I suppose you can caluclate the bearing strength of the insert and then work out what the surface area of the insert needs to be in contact with the skin to meet the shear strength requirment? I'm not sure how I'd approach pull out strength though... For the flox injection method I guess I may just have to make some test samples and destructively test them (Hey, who doesn't love breaking stuff!!...) unless there's some existing data out there for bearing strength of flox-epoxy?
Cheers
Dave
