Composite beam h/tw ratio
Composite beam h/tw ratio
(OP)
I'm trying to engineer a composite carbon boom for a dinghy. This basically behaves like a simply supported beam with a no-centered vertical point load.
I'm setting up a spreadsheet using maximum strains to check the laminate. I've UD plies running on top and bottom of a rectangular profile and Double biax or -/+45 wrap over the whole section to cope with shear on vertical walls and encapsulate the UD.
After some load calculations I get a design vertical force of 4700 N to start with. I've limited strain to 0.6/1.2 % compression/tension respectively for UD carbon and a maximum deflection of the overall beam to 2% of the span.
The long sides are placed vertical and I'm ending with too thin vertical walls and I'm concerned about the dimension proportions h/tw (may be local shear buckling in the profile?).
Please could you advice which book/examples could help me to work on this area?
I'm setting up a spreadsheet using maximum strains to check the laminate. I've UD plies running on top and bottom of a rectangular profile and Double biax or -/+45 wrap over the whole section to cope with shear on vertical walls and encapsulate the UD.
After some load calculations I get a design vertical force of 4700 N to start with. I've limited strain to 0.6/1.2 % compression/tension respectively for UD carbon and a maximum deflection of the overall beam to 2% of the span.
The long sides are placed vertical and I'm ending with too thin vertical walls and I'm concerned about the dimension proportions h/tw (may be local shear buckling in the profile?).
Please could you advice which book/examples could help me to work on this area?





RE: Composite beam h/tw ratio
I can't help you with your calculations.
RE: Composite beam h/tw ratio
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Composite beam h/tw ratio
The mandrel to build the section is 40mm wide and 80 mm tall.
Appart of bending on vertical axis, should I be worried about h/tw going to high? Just for curiosity, is there any source where I could read about it?
Thanks again.