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that FEM looks like gross overkill for that structure. have you analyzed it by hand so you have something to compare the FEA results to? do you not have a local mentor?

you mean like I currently have in my home office. :)

hmm, surely there is steel rebar in the building? you need to account for that in the analysis. otherwise post some pictures of the areas with singularities, with stresses and boundary conditions. I suspect the boundary conditions are too rigid.

please do not double post.

yes, in aerospace structural analysis. thermal loads from FEA are often high because FE models tend to be over stiff (missing lots of local flexibilities). what type of model - beam, plate, shell, solid? how are you defining CTEs? how are you defining boundary conditions?

do you not have the aircraft maintenance manual? surely such procedures would be in the AMM.

So Chaos, are you a student? Or do you work for an engine company? Or what motivates your interest in this topic?

So I’m in a different industry, and have watched (read about) the ASD vs LRFD debate for some time, with a mixture of amusement and confusion. As a note, ASD is essentially what we use in aerospace. Reading the start of the paper linked above, the only difference seems to be that ASD uses one...

perhaps something like a hardness test could confirm the properties. are there any such tests recommended in the ref'd text?

https://en.wikipedia.org/wiki/Extended_finite_element_method Lots of other info from a simple google search.

i suspect this info is proprietary to the engine manufacturers

and presumably this is the joint shear allowable, not the fastener shear allowable.

https://web.archive.org/web/20250423030416/https://www.seattletimes.com/seattle-news/key-bridge-to-mount-rainier-starting-to-buckle-closes-indefinitely/

if you are in a seismic zone, those cripple walls are notorious for falling over in an earthquake, and thus need to resist shear loads from the building above.

maybe it means 0.2 times the material tensile strength * area? a rivet is going to develop nowhere near the base material strength.

I've owned two houses with plaster and lath (1914 and 1925 vintage), and ripped a lot of it out when remodeling. All of the lath was nailed with small smooth shank nails. Some of it came out easily, other areas required lots of prying. A lot depends on the type of wood used for the studs.

Where did you see this "guideline"? Riveted joint strength (tension and shear) is often not driven by the fastener strength, but by the sheet strength. Hence why there are "joint strength" values in MMPDS (and company allowables documents). Vendor fastener strengths are based on tests with...

it appears to be a Socomore not SPS product: https://www.socomore.com/en/curative-component-aeroglaze-9700b-lined-quart.html

Those gearboxes have very high fatigue loadings, for a large number of cycles. Fatigue can be hard to predict. and as a result they require lots of maintenance, which can be expensive. Everything on an aircraft, and even more so on a helicopter/VTOL vehicle, is very weight critical. (wind...

Suggest you search thru the Engineering Business Practices forum where this has been discussed in several threads.