Hello everyone,
In consultation with our NAA, i'm currently undertaking an analysis to see whether a primary structural joint on an aircraft can be shown as fail-safe under FAR 23.572(a)(2). I'm using FAA AC 23-13A as guidance, specifically para 3-10(b):
You may also use the analytical...
Hello everyone,
As the title suggests, i'm having a look at some lugs that aren't loaded purely axially. I've come across a reference "Fatigue Testing of Transversely Loaded Aluminium Lugs" by Larsson, N in 1977. It was written at the Aeronautical Research Inst. of Sweden, Stockholm. Structures...
Hello learned forum members,
I've inherited a process for forming and heat treating some thick walled spring steel tube. The tube is 5160 steel with 0.55-0.65% C and 0.7-0.9% Cr. There is no record of how this process was developed, and it was long before my time at this company.
The process...
Hello everyone,
I've been having some fun recently developing some test models of bolted lap joints that have included a solid bolt and contact between relevant surfaces; for the purposes of learning i'm leaving friction out of the equation for the time being. So far i've found a way to get the...
Hello everyone,
My company procures 92" lengths of 6061-T6 extruded aluminium. The extrusion is a hollow section with an average wall thickness of about 0.1", give or take. Recently we had cause to perform some mechanical testing on a sample of the part. We took six samples from the hollow...
Hello everyone,
*For the purposes of anonymity I am going to be deliberately vague on some details, and I appreciate your understanding in advance.*
I work for an aircraft manufacturer, and I have recently discovered that we may not, in my opinion (and I stress the in my opinion bit), have the...
Hello everyone,
I'm contributing a small section to a colleague's report that is showing compliance with structural aspects of FAR 23 for a fixed wing aircraft's control system. The control system is fairly agricultural, i.e. cables, bellcranks, pushrods and the like.
One component subject to...
I've just been reading FAA AD-2016-04-08 which refers to "overwing flex tees" on the B788 as being principal structural elements, the failure of which may reduce the wing's ability to sustain limit load.
What's an overwing flex tee? Is it a common feature on BCA wings? Or is it something that's...
Hello all,
I am creating an assembly in Abaqus V6.10 which consists of 5 3D deformable shell parts connected with point based fasteners. Fasteners are common to either 3, 4 or 5 of the parts and are based on points defined on the extreme part surface.
When viewing the connectors created in the...
Hello all,
I recently completed a modification that introduced a round penetration to the shear web of a folded sheet metal fuselage floor keel beam. The keel beam is 0.050" thick 2024, of channel cross section, about 8" deep and has 0.75" wide return flanges. The upper and lower flanges...
Hello learned aeronautical community,
I have been asked recently to allow the creation of a wiring loom penetration in the shear web of a fuselage keel beam in a FAR23 aircraft for which we are the OEM. The proposed penetration is circular, 2" in diameter and located on the beam's neutral axis...
Hello learned Forum regulars,
Long time lurker, first time poster... (sorry, couldn't help myself)
I'm looking at two charts from a company structures manual that are entitled 'Reduction in Crippling Strength from Joggles and Crimps'. They contain data on 4 curves: 1. Joggle, 2. Double Joggle...
I would like to enter 2 dimensional coordinate data into s/works to create a sketch for extrusion / lofting. Does anyone have any suggestions as to a way to do this? I have tried importing all types of ASCII files (Windows Notepad), such as *.igs, *.vda, and the like, but to no avail.
