I'm a little embarrassed that I haven't figured this out thus far into my career, but alas, here I am.
Let me start by stating (in simple terms) what I think is true on this topic:
1. The limit load LL is the maximum expected applied load that could occur during service.
2. The design...
Hello. I'm relatively new to vibration analysis, and I am trying to understand how to bin a narrow band FFT into one-third octave bands. My measured data has units of lbf, and lbf-in. Most of the information on this topic is acoustics related, but I can't find much for other units that aren't...
I do vibration analysis and testing, so we use the units of g-rms often. I see all sorts of ways to write this and I want to know once and for all what the right way to write it is. Options:
1. Grms
2. G-rms
3. gRMS
4. g-RMS
5. grms
6. g-rms
7. GRMS
8. G-RMS
I can't find an official source...
Suppose you have an assembly that will go on a launch vehicle and be subjected to random vibration. Also suppose the input random vibration PSD (acceleraton spectral density) is given in the launch vehicle coordinate system, with the X-axis aligning with the axial direction, and Y-axis aligning...
Hello all. I'm working a project bound for outer space that has fracture requirements associated with it (NASA-STD-5019). One of these I'm trying to show for my parts is to show "parts have total net-section stresses, e.g., maximum principal or von Mises, whichever is larger, at limit load...
I am trying to calculate the stiffness of a custom screw using K = EA/L, but while specifying the length, I'm having a hard time visualizing how a fastener elongates along its length when preloaded into various plate configurations.
As a simple example, suppose you have two plates that are...
Hello all. I'm trying to get my terminology correct for torque.
I've got a design where a fastener is threaded into a locking insert. I understand that some of the input torque gets "eaten up" by the locking feature, so the running torque must be added to the final desired torque that...
I'm relatively new to bolted joint design and analysis, and want to master the subject. I've read statements that say something like "friction eats up preload". This makes sense, but I want to understand more clearly the physical mechanism behind it.
I have thought about this for about an...
I thought I understood this, but now I'm slight confused. It seems there are several names for cap screws and I'm trying to figure it out.
A cylindrical socket head cap screw can be called a socket head cap screw. (Not to mention hex-socket cap head screw.) I thought the cap meant that is...
