hello folk. i am task with performing bench mark test on abaqus to evaluate if it is a good switch from nastran for my company. we specialize in fem fracture mechanics work, and hear that abaqus is superior for crack grow simulation. any one have similar background or know best way to compare...
i understand that hand calculations are simplified, but my question goes toward if hand calculations are off the detailed model by almost 25% even in the simplest of cases, how can one even begin to assess a structure without the use of detailed fea for "real" structures without gigantic factors...
Good morning lads and salutations. i have clarifications to give on a post i made in another forum here in the structures forum. i am designing a single piece bent frame for an aircraft ground support structure (pics are simplification of actual design, assume uniform depth into sheet w...
take a look at the AF Stress Manual or Bruhn for some lug design and eval guidance. i would enjoy hearing if your fe analysis correlates with the results from this calculations.
~Robert
Thanks for the contributions everyone!
I understand that in my simple diagram I depicted a sharp corner.... per rb1957' and bugbus' comments of course there would be some rad at the corner. Pick any radius and you'll see my point below is illustrated.
If were to add the rad in that corner...
How are you able to determine that plane sections will not remain plane in that corner? Is it because the load has to change direction, which is "different" from your classical 1D beam? I also understand that per St. Venant's principal the Mc/I is not applicable directly near supports, but in a...
The photo I included was only meant to be notional, and as I'm concerned with net section stresses I didn't have an interest in getting into the weeds with stress concentrations. Let's assume that this is only one piece...it is obvious to me that multiple pieces screws would come into play. What...
Salutations everyone. I've got a question regarding the stress in a frame, or one could call it a beam bent 90 degrees. Assuming the beam has the dimensions shown in the image, I'm having trouble doing hand calculations at the corner indicated in the photo. Obviously there are the classical...
Good morning lads. I've noticed that oftentimes some of the senior engineers I've worked with indicate that shock analyses are inherently conservative versus reality. I understand that using modal combination, like SRSS, is conservative generally because it assumes that all modes in are phase...
I am familiar with many of the other classical aerospace textbook references like Bruhn and Niu, but Shigley's is the only such textbook I have on my bookshelf so I tend to default to that. I've seen some qualitative suggestions from Sandia National Labs as well, but never anything concrete. The...
Hi everyone. I know that in the aerospace industry, NASA-STD-5020 is a standard that most companies rely on. However, I have a question regarding estimating joint stiffness factors for cases where there is not enough material to develop the full frustum suggested by Shigley's approach. Does...
