It would depend on the pipe's configuration (Length, diameter, end condition). I would say as long as the pipe's natural frequency does not fall in the working ultrasound frequency, and the pipe is reasonably solid. It should be able to be considered as rigid boundary.
The material is stainless steel. The substrate surface is milled and grinded. The bead is cold drown stainless steel wire. Surface are all cleaned before welding.
Recently, I am assigned a project to find reason why our lasor welded part has porosity in the welding bead. Under the microscope, gas bubbles are as large as 5/1000''. The porosity usually exists at the boundary between the bead and the substrate.
As I have little experience with welding...
You have two choice to deal with sharp inner corner.
1) if you are confident that the corner is not the point of interest, just ignore it. the stress singularity is just a numerical issue.
2) if the corner is indeed your point of interest. model it with a fillet. Pure sharp corner doesn't...
Some sample quote I got from various FEA suppliers this summer.
Algor linear package: 9900 w/ one year service
COSMOS linear: 7000, service is 2200 per year
ANSYS linear: 16000, service is 3000 per year
What is the material of your cylinder? What kind of analysis? What kind load you got. You could model it as 3D model using shell element. If your are doing static stress, the compound could be ignored.
For quick hand calculation, assume there isn't pressure loss from the nozzle and to the wall. The net pressure on the cylinder wall would be P = 20MPa. Since the wall thickness t = 5mm << r = 90mm. The wall could be considered as thin wall shell.
The problem is close to pure shear stress...
Maybe not as negative as we thought. Aircraft industry doesn't have the luxury to be over conservative. What we get from the FEA model is one thing, how the product performs in real world is another thing.
I would suggest that you describe your analysis and assumptions in more detail, and let...
Transient load should be obtained from field testing/measurement. If you don't have real world data for your shock load, I would suggest you to consult some vibration testing standard, such as MIL-STD 810F (Method 520.2). You can use the shock load function descripted in that testing standard...
Some one posted a bounch of helpful online ansys tutorials before, I don't recall who. But here is the copy of that list.
http://ansys.net/ansys/
http://www.mece.ualberta.ca/tutorials/ansys/index.html
http://www.eng.buffalo.edu/~abani/fem/fem.html...
