Abaqus beginner

[andreadelvecchio]

Hello to everybody, i'm italian student. And i m starting my thesis with abaqus. I start with tutoril that i finding in web, such a cantilever beam. I've a problem, the stress change when i change the mesh (type or seeds), i don't understand why, can you help me?

 

[andreadelvecchio]

Help me

 

[testing]

Think about what it looks like when you try to represent a parabola with 2 straight line segments? How about 4? What happens if you keep increasing the number of line segments used to represent the curve?

 

[andreadelvecchio]

you're right , but I have done the calculation by hand , and if I increase the mesh increase the solution moves away

 

[testing]

Are you sure your hand calcs are correct? And by increase the mesh, you mean increase the number of elements? Are your boundary conditions correct? Does the FEA solution approach an asymptote as you further refine the mesh?

 

[andreadelvecchio]

the solution with my hand is correct, i'm sure. i have change the "approximate global size" in "global seeds" i do not know if it's correct, i'm asking you. I don't understand last question. sorry and thanks

 

[andreadelvecchio]

the solution with hands is the same with aproximate size of the seeds 10, with 5 everthing's change

 

[testing]

What's the length and depth of your beam? It looks to be about 10:1, which is going to be on the edge of Euler-Bernoulli theory's suitability assuming that's what you used in your hand calcs.

 

[andreadelvecchio]