Hi all,
Aero guy here doing some basic work on a beam for a personal project, wondering if anyone here can help me out. Pics attached show the beam dimensions and configuration, along with some napkin math. This was done to learn a bit more about wood construction as much as anything. I realize...
Hi All,
I've been tasked with setting up the instrumentation for on of my company's structural tests. I interned as a test engineer back in undergrad but since then have been firmly on the manufacturing and design side of the house so I'm a bit rusty.
I am installing strain rosettes in various...
I'm working on obtaining lamina level data for a material system we are using in one of our products. Looking at past programs at my workplace, we have used both the D3518 and D5379 tests for lamina (0/90 balanced woven composite) level shear property data.
Is one of these tests considered...
Hi All,
I've been handed my company's ancient static test system to keep running for the foreseeable future. The core to this system is an Edison Hydraulic Load Maintainer, which utilizes a combination of a balance beam, spool valves, and dash pots to regulate hydraulic pressures. Unfortunately...
Hi All,
I've been tasked with heading the design a effort for a mechanical vibration/shock test (Following MIL-STD-810G methods) and I'm having some difficulty with the fixturing. I'm a structural analyst/designer by trade so I'm familiar with the programs, but my bread and butter design wise...
Hi all,
I'm running an analysis with a bunch of linear gap elements and the "Gaps as contact" flag turned on. To make it run correctly to actual convergence, I have been adding a BCTPARM line to control convergence requirements manually by doing the following:
Analysis -> Preview -> Edit...
I had a situation in which I needed to activate some rotational degrees of freedom on the independent side of am RBE3 due to geometry (linear set of points). I noticed in the model sometime later that those same rotational degrees of freedom were activated in a different RBE3 in the model. I did...
Hi all, aero structures guy needing some help. I normally analyze things that don't move (running loads in bonded aircraft longeron/spar/bulkhead joints for example) so I'm a bit out of my wheelhouse here. We've got a test setup in which we need to pull on a ball joint. The joint geometry is...
I'm currently looking into using flush head blind rivets on a simple system I'm designing. I have come across several different rivet specs and very little information on which rivets typically get used for specific applications. Specifically, I've seen a lot of references to the NAS1921...
Hi all,
First post here, let me know if I'm not in the right section.
I'm working on some bolted shear-tension joints. I'm currently planning to use NAS6206 bolts and MS21042 deformed thread lock nuts. This application is my first exposure to this series of fasteners and I have a question...
