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I've got a question regarding what the industry standard way is to apply air loads to flight control surfaces such as ailerons that have the typical sheetmetal skin/ ribs/spar design. On the project I'm working on, the loads are applied directly to the ribs/spars in the loads FEM, and nothing...

I've always used 2D ortho for core. I don't think you'd be capturing any transverse compressive forces or stiffnesses with the CQUAD4's, considering they don't have two nodes in element Z direction that could move closer to eachother. And I wouldn't think that the deformations resulting from...

For interior monument attachments (such as tie rod fittings), Boeing Doc. No. D6-55441 specifies to account for an additional load vector that is 10% of the axial load. This works out to a misalignment of about 5.7 degrees. Although some DER's want 7 degrees of misalignment. Just depends on...

The best way to get transverse load capability of a panel is by obtaining test data. Manufacturers like Gillfab post their panel strength data on their website.

Depending on what the bolt is used for you may need to check for yielding under limit loads in addition to an ultimate loads analysis. You would of course using be using Fty as your bending stress allowable.

I would just analyze the tie rod as an axial member in compression (using Niu, Bruhn, your company manual or whatever), I've never once had a DER be concerned with effects of end moments due to friction in the spherical bushings, because its most likely negligible. And if you have a positive...

Are you analyzing a Z, U, or T section beam? If so there's some empirical equations in the McCombs supplement that let you calculate allowable bending moments that are limited obviously by buckling of the outstanding flanges.

I've ran into this situation before as well. Even in Niu, the equation for calculating rotational restraint along the unloaded edge (Eq. 11.2.5) requres a variable 'Sv' (which is the same as your 'M' variable) to be known. The book says that the value of Sv is very difficult to determine and...

I understand the term now, thanks guys.

I've seen the term "bypass stress" used in threads regarding stresses around holes. What is bypass stress?

Thanks for the reply. Are end fixities typically modeled using torsional springs when the beam is modeled in the FEM using beam elements? If so, how is the spring constant value determined? Since the end moments will be a function of both the beam itself and the support structure, can you...

Typical applications are for 737, 747, etc. My company does executive interiors and many times we have to model floor structures to obtain x,y,z stiffnesses at certain locations of interior monument attachments. Floor structure is typically modeled using bar elements with pinned/fixed...

Hello, I have a question concerning end fixity of floor beams. Am I correct in interpreting end fixity as the ratio of the end rotation of the beam when subject to a unit moment (theta1 = L / 3EI) to the sum of theta1 and the rotation of the end support when subject to a unit moment (theta2 =...