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I'm looking for an analysis method for a sandwich panel subjected to out of plane shear loads which takes into account the shear capacity of the face sheets. Facings are carbon fibre with nomex core approx 50mm deep. Currently I'm assuming the shear is carried on the core only but this is giving...

I'm trying to model a wing leading edge rib. The overall rib section is a C". The rib web is modelled with CQUAD elements and the flange with CBEAM elements. The outstanding flange around the edge of the rib (which forms the top and bottom horizontal 'legs' of the 'C') is 60mm wide. The CBEAMs...

I have a requirement document that states "no major fatigue damage thru a 25500 flight hour / 17000 flight cycles for economical life, minimum scatter factor of 4" Does this mean that I need to test to 4 times the life, ie 4*25500 hrs or 4*17000 cycles? And do I also need to factor my fatigue...

I have a requirement document that states "no major fatigue damage thru a 25500 flight hour / 17000 flight cycles for economical life, minimum scatter factor of 4" Does this mean that I need to test to 4 times the life, ie 4*25500 hrs or 4*17000 cycles? And do I also need to factor my fatigue...

40818 It is just a portion of a leading edge with limited curvature. I've had a look in Bruhn & Nui but they seem to only give compression + pressure cases and look at panel buckling. In my case I have tension plus pressure. ESDU seems to have a datasheet but my a/b ratio is outside the limits...

Check out "Practical Stress Analysis for Design Engineers" by Flabel. Very good book for beginners and there is also an associated course. One of our new recruits is currently taking the course and is making great progress.

I want to find the stresses in a panel which is part of a wing leading edge. The panel is curved in one direction (fwd - aft) and is subject to a uniform pressure load and tension in plane loads from wing bending. I can find a method for a flat plate for these loading conditions but not for a...

Practical Stress Analysis for Design Engineers is a very good book as an introduction to aircraft stress. I would recommend reading this before going on to Bruhn.

Can someone explain to me the concept of "bearing bypass stress". It seems to be related to bolted joints in composite materials but does it also apply to metals? Thanks

I have a shear panel which approximates a triangle in shape, height a, base b. I want to find the critical shear buckling stress. I have some buckling curves for rectangular panels in shear but I think if I idealise my triangular panel as a rectangular panel of dimensions a and b then that will...

I'm currently involved in the "Checkstress" activity for a civil aircraft project. I know that checkstress is meant to be an independant check of the stress analysis but is it a EASA/FAA/JAA requirement to do this and if so can anyone point me towards the necessary documentation defining the...