Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
(OP)
Hello
I started with a simple model a column in 3D, fixed at the bottom and the top expect a horizontal direction where a displacement was added along the edge equal to 3 cm(in the X direction).
I defined the properties of the steel elastic E 210 000 MPa , perfect plastic fy=235 MPa plastic strain= 0.
The values of S22(the vertical axis reached 285 MPa)
I've tried to change the boundary conditions also but it doesn't work.
Any one can help please
Thanks in advance
I started with a simple model a column in 3D, fixed at the bottom and the top expect a horizontal direction where a displacement was added along the edge equal to 3 cm(in the X direction).
I defined the properties of the steel elastic E 210 000 MPa , perfect plastic fy=235 MPa plastic strain= 0.
The values of S22(the vertical axis reached 285 MPa)
I've tried to change the boundary conditions also but it doesn't work.
Any one can help please
Thanks in advance





RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
Also, look at von Mises stress and/or equivalent plastic strain. Mises yield surface is used to define isotropic yielding in Standard.
RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
The higher displayed values come from extrapolation of these values to the nodes.
Make sure you don't reach the ultimate yield stress at the integration points and that the extrapolation does not alter the results significantly. Refine the mesh to minimize the last effect.
RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
In fact I've checked the results of the integration points and the values exceed the yielding stress in the vertical direction in all the simulations even though the Mises stress gives always the correct values and present an elastic perfect plastic behaviour.
I've performed static and dynamic simulations with different structures and the same problem appear each time.
Finally I think that it's related to the boundary conditions that I applied since the high stresses are located at the edges.
I've checked my model several times at there is no mistakes.
Can a found a solution? or I should just ignored and check my model by only referring to the Mises stress?
RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?
Read carefully what Dave442 and pdiculous963 said.
RE: Why I have a stress that exceed the yield one in an elastc perfectly-plastic simulations?