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Hello Everyone, I did very simple axisymmetric contact model of ball and plate. For plate material I have used UMAT to define user defined material properties. My problem is, when I extract stress/strain from UMAT for specific element number to .msg file. I don't see anything. I see output for...

Hello Everyone, I am doing one Abaqus simulation in which I have used user subroutine to define initial stress condition in the geometry. However, I see that this stress condition gets modified and is not propagated as it is across subsequent Abaqus steps. Can anyone suggest me any possible...

Hey, Since the solution is not converging, I guess forces are not in balance at elemental/nodal level. But at global level I have applied equal and opposite forces in all directions, therefore I thought my solution should converge. Ideally there are no boundary conditions to this volume element...

Hey, Thanks for your reply! Yes all the loads are self balancing during entire analysis. In the model, I have applied loads as stresses/pressure. Same pressure is applied on the opposite faces. meaning S11 of same magnitude is applied on the faces perpendicular to X axis. Similarly, S22 is...

Hello Everyone, I am doing one very simple 3D simulation in abaqus. It includes unit volume element which is loaded with three normal stress components along three coordinate axes and one shear stress component (in XY plane). The stress amplitudes vary periodically as function of time over the...

Yes it does.

Hello everybody,  I am doing one residual  stress simulation. I have two part instances which come in contact and one of them has non-uniform residual stresses from the beginning. I have written *SIGINI subroutine to apply non-uniform initial stress. I tried to apply this stress using python...

Hello all,  I did one elastic-plastic simulation using Abaqus/FEA. I used C3D20T (hexahedral quad) solid element which has 27 integration points and 20 nodes. For one of the element, the stress that I got at the centroid is completely different from the stresses that I got at the integration...

Hi Everybody, My question is regarding transformation of results from rectangular coordinate system to cylindrical coordinate system. I created quarter symmetric cylinder model and I wanted to see results in cylindrical coordinate system. When I see output for COORDS->COOR1 (which is the...

Hi IceBreakerScours, Thanks for your message! Yes 5% variation in IVOL is matter of concern for me because I plan to assign different material properties at each integration point within element. Therefore, I need to have some control over the percent volume fractions of the different...

Hey, I did one 3D simulation with 126750 elements of type of C3D8T. This has 8 integration points per element. I extracted IVOL values of each integration point for all the elements to determine percent volume fraction allocated to each integration point within an element. The minimum and...

Hello all, I want to do one simulation in which I want to control the assigned integration point volume inside each of the element. One preliminary analysis shows that this assignment is random inside C3D20T elements with 27 integration points. Hence can somebody direct me on how to control...

Hello everybody, I am doing one 3D contact simulation between two bodies. I did my simulation using static general steps with C3D20 elements (i.e. Hex 2nd order). It finished in 28 hours with 1E+14 floating point operations. Then I performed the same simulation using coupled temperature...

Hi everybody, I am doing one analysis with UMAT, in which I want to assign material properties to the points in space based on their co-ordinates in user defined local CSYS. The problem is UMAT by default uses coordinates of the points based on global CSYS. Hence can somebody please guide me...

Hi everybody, I am trying to simulate UMAT subroutine for very simple 3D problem. I have a cantilever beam and I am applying (-ve) pressure at one end. In UMAT, I have written a code for Isotropic Isothermal elasticity. Which is nothing but *ELASTIC option in Abaqus. But still I am getting...

Thanks! It helped..

Hi Everybody, I was interested in knowing, what formula Abaqus uses for calculating CPRESS i.e. contact pressure between any two bodies? Any direction on this would be very helpful. Thanks in advance, Nik

Hello Everyone, Not sure if this is the right forum to ask, but any input would be appreciated. Abaqus licenses on our lab computers were working fine till yesterday. But all of sudden from today we are getting following error message: Cannot connect to license server system. The license...

Hi Everybody, I am simulating contact between two solids. And I want to modify the default pressure-over closure relationship. So for this first I am interested in knowing the default contact stiffness which Abaqus is using for my model. Hence, can somebody please direct me on how to determine...

Hello all, I am doing one 3D analysis with 5 time steps. For each time step, I have specified U,UR,UT variables in Field Output Request. But the odb file contains results for U & UT only. No data for UR variables is available in the output. So can somebody please suggest where am I going wrong...