Hi,
I recently had a discussion about FE static nonlinear model reduction and I would like to ask you for the state of the art methods concerning this matter. It is well known that the use of substructuring or sometimes called superelements can significantly save the development and...
Hello group!
today a question regarding interface loads deviation between different models & techniques, global & local models, hand calculation etc.
It is well known if the different techniques and model discretizations will be used (especially the very coarse meshes, remember complete...
Hello,
The interpretation of the paragraph § 25.603 Materials regarding primary structure was discussed here: thread2-45169. What about secondary structure like interior: baggage compartments, wall panels, lining panels? Is there 25.603 especially point c) applicable? It says "take into account...
do you know any freeware or low-cost software for acoustic calculations? The field of interior acoustic and simulation of transmission loss are the main fields of our interest. Thank you for any tips.
Hi,
After a long absence on this forum I want to continue this thread16-154238
There was a disscussion about taking into account a "material correction factor" to the ultimate test load value according to 25.307(d).
This paragraph implies, that no additional correction factor must be included...
What is the difference between MPC Explicit constrained in DOF:1 (dependent); DOF:1 (independent) and rigid element RBE2 constrained in DOF:1 (dependent). RBE2's have 6DOF for independent node by default. Are both elements (=equations) interchangeable?
[irq]
Hello,
Assume the fasteners subjected to eccentric load, where by theory the force on each fastener is proportional to it's distance from the centroid of the fastener group. For the joints, which carry no moment it is generally assumed that each fastener is equally loaded. In case of eccentric...
Do you know any standard, where I can find the determination of the material shear properties of the prepreg skin build in thin sandwich construction? The standard bone shaped shear tensile specimen seems to be not appropriate in this case.
Hello,
Please see attachment - there is a sandwich panel. Let's imagine it is loaded by pressure acting on the top, so that the skins are loaded in tension/compression. The aim is to design the part joining two separate sandwich parts. In many repair instructions we can see the method (1)...
I need your advice in coupon or connections testing to produce material design values in composite field. I am comparing the new prepreg material to the existing one. The set of samples shows a high percentage difference between standard deviation and mean value of the new material and leads to...
I am interested what is the definition of the signature in different organizations? What responsibility you take if you prepare, check or approve the technical documents (you can give some example tasks e.g. for stress reports)? What in case of a new document issue? Are you responsible for a...
The aim is to obtain the compression design allowables for a thin skin of prepreg on a honeycomb core of a sandwiched construction. Let's assume we have two options: 1 ply (0.01inch) or 4plies (0.04inch) on approx. 0.5inch panel. Because of the buckling it is not possible to conduct the uniaxial...
Could you recommend some references with many examples and tips, how to prepare, organize and build/realize the big professional project especially in engineering applications?
Could you suggest a good adhesive for bonding polyamide PA66 to an aluminum block? The assembly should hold relatively high static loads under ambient conditions. As the bonding area is not large, I am looking for material with 10-15MPa shear strength and having a problem with this. The...
Do you know the allowable shear (if possible also tension) value for rivet MS20470AD6 (3/16) with protruding head and sheet thickness 0.05inch (2024T3/T42)?
Mr. Niu provides in his book the tables, but only up to size 5/32 (pg. 286). Btw. the allowables in this book seems to me very...
I am designing some components, which are connected to the seat track introducing high amount of moment into it. What constraint conditions do you usually apply to simulate seat track connections? Are the translational directions enough or should I also include rotations (it is not too...
Let's assume the part, which has been substantiated by a static test. How to show properly the similarity (the components are not identical) of the new part for FAA approval? Which points should be adressed in the similarity report? I would really appreciate, if you could give here some links to...
Hello everybody,
Unfortunately the following thread has been closed:
http://www.eng-tips.com/viewthread.cfm?qid=256487 and I need to open a new one.
I have a cylindrical sandwich panel (see a picture) and I want to check the core for crushing under applied pressure.
I have FE-Model in...
Hallo!
I have problem with evaluation of sandwich structure in SOL 600, which is built up in PCOMP by 10 layers. After importing of Results (*.t16) I see in Patran only 5 layers. Where are the others?
Which settings should I set to see all 10 layers?
TX!
Irq
