RGX124
Mechanical
- Apr 5, 2005
- 75
Hello,
For a linear isotropic elastic material, I applied a load defined by an amplitude (0,0;0.25,1;0.5,0;0.75,-1;1,0) to obtain uniaxial tension on a block.
At steptime 0.25 and 0.75, the stress is OK (constant=to the applied load); at time 0.5 and 1, there is a very small negligible stress (1.10^-13 MPa compared to 10 MPa) distribution in the part. I am very surprised with this result at unload (see attachment) especially in linear elasticity where you should come back to the initial state when you unload. I tried it in ANSYS, and one obtains exactly zero!!!!
Is this normal? Is it a problem known with Abaqus? Is there a way to overcome this? It is perturbing when teaching to students.
Thank you for your help
Rgx
For a linear isotropic elastic material, I applied a load defined by an amplitude (0,0;0.25,1;0.5,0;0.75,-1;1,0) to obtain uniaxial tension on a block.
At steptime 0.25 and 0.75, the stress is OK (constant=to the applied load); at time 0.5 and 1, there is a very small negligible stress (1.10^-13 MPa compared to 10 MPa) distribution in the part. I am very surprised with this result at unload (see attachment) especially in linear elasticity where you should come back to the initial state when you unload. I tried it in ANSYS, and one obtains exactly zero!!!!
Is this normal? Is it a problem known with Abaqus? Is there a way to overcome this? It is perturbing when teaching to students.
Thank you for your help
Rgx