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fstopelli-214-Alexandrite
14-Alexandrite
March 18, 2019
Question

Linera Analysis Vs Non-Linear Analysis

  • March 18, 2019
  • 1 reply
  • 10306 views

Hello, 

I did two analysis:

the first, I imposed a force to obtain deflection f = 0,25 [mm] (linear analysis)

the second, I imposed a deflection of f = 0,25 [mm] (non-linear analysis with elastoplastic material)

In the analysis, material, geometry and mesh are the same. 

 

Max Stress in first, 50 [Mpa] (no error in analysis)

Max stress in second, 300 [MPa]

 

Is it possible? It seems very strange...

 

Thank you

 

 

 

 

1 reply

G
gfraulini17-Peridot
17-Peridot
March 18, 2019

I guess it depends the way you imposed the displacement respect the way you imposed the force.
Does Each ways permit the same deformation of the structure?
It's hard give you something more without images or other.

    F
    fstopelli-214-AlexandriteAuthor
    14-Alexandrite
    March 18, 2019

    Force and displacement are applied on two surface

    G
    gfraulini17-Peridot
    17-Peridot
    March 18, 2019

    For that I can see from the pic, you have imposed displacement in all directions (all three small rectangulars are blanked, I guess for example dx=0, dy=0 dz=something); in this manner you impose that the surface is rigid/undeformable because all its points must have the displacement (therefore the deformation) imposed.

     

    If you did the force analysis by applying force over the same surfaces with directions like the imposed displacement, then in this case it could deform in x and y.

     

    I don't know how you did the force analysis, but to have the same results you must deform the structure in the same way to obtaion the same distorsion energy amount.

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