compare the results

[nikko801]

If someone it's practice with abaqus i have this problem.
I have modeled a circular plate with thickness of 0.0005 m and a pressure applied on a ring area between r=4.5 mm and r=5 mm of 0.5 N/m^2. The 3 translations at the border are blocked (U1=0,U2=0,U3=0)

I solved the problem in two different way:

3D analisys with the whole plate and a pressure on a ring area.
axisymm analisys (than modeling the 2D profile of the plate) with a Force concentrated F=7.4613E-06 (equal to the pressure) applied at r= 5mm that is the same of the analitycal problem.

my problem is that I have found very similar results for the numerical solutions but a different results compare to the analitycal solution and with an other numerical solution (Nastran)

this perblem is not difficult to model especially for people that use abaqus frequently than I would ask if anyone try to solve then we can compare the results for displacment and stress

thanx

 

[bassmanjax]

Hi Nikko801

What is the diameter of the plate?

Regards

Martin

 

[bassmanjax]

Also, what are the material properties?

Martin

 

[nikko801]

oops sorry I forgot some data

diameter of the plate is 7.5 mm
thickness= 0.5 mm
ring where the presssure is apply have external diameter=5 mm
internal diametr=4.5mm In the 2D axisymm solution I have modeled a concentrated force equal to the pressure on the ring in r=5mm because is equal to the analitycal model)7.4613E-06 N

E=3GPa
POisson modulus=0.3

thanx nikko

 

[nikko801]

I have found my error.now my resuts are the same.. in the numerical solution I have used different costraints from analytical..