Deciding Number of Fasteners
Deciding Number of Fasteners
(OP)
Hi There,
Nowadays I'm having some problems about fastener sizing and I thought Eng-tips can give me a hand. I'm designing a simple shear panel which is connected to C profiles from edges. For better imagination you can have a look to my sketch,
http://prntscr.com/4qksim
Also I have some supporting profiles one edge to other edge along panel. Usually I was using RBE or BAR elements to present fastener connections now I've tried to check shear force distribution, you may have a look to it from below
http://prntscr.com/4qku93
it's shell force resultant as N/mm, I used maxshear results from nastran. As the pitch distance 40mm, I have 25 fasteners per meter. Since the shear allowable is 8KN per fastener, my shear allowable is about 8*25=200KN/M (or 200N/mm). So with this method I need to increase fasteners 2 times which is not sounding realistic. Also I have tried some freebody methods but because of my profiles are equivelenced it's not possible to have proper result via freebody methods. I wonder can you suggest me a method to size my structure in sense of riveting.
Nowadays I'm having some problems about fastener sizing and I thought Eng-tips can give me a hand. I'm designing a simple shear panel which is connected to C profiles from edges. For better imagination you can have a look to my sketch,
http://prntscr.com/4qksim
Also I have some supporting profiles one edge to other edge along panel. Usually I was using RBE or BAR elements to present fastener connections now I've tried to check shear force distribution, you may have a look to it from below
http://prntscr.com/4qku93
it's shell force resultant as N/mm, I used maxshear results from nastran. As the pitch distance 40mm, I have 25 fasteners per meter. Since the shear allowable is 8KN per fastener, my shear allowable is about 8*25=200KN/M (or 200N/mm). So with this method I need to increase fasteners 2 times which is not sounding realistic. Also I have tried some freebody methods but because of my profiles are equivelenced it's not possible to have proper result via freebody methods. I wonder can you suggest me a method to size my structure in sense of riveting.





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