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  • Users: Entherm
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  1. Entherm

    Von Mises Stress Plot, ABAQUS

    This is the plot of von mises vs time for a plate modeled with shell elements. The graph looks so weird. What might be the reason for this?
  2. Entherm

    Abaqus, Imperfection

    In Abaqus, when using imperfection from buckle analysis, how do we determine the scale factor? *IMPERFECTION, FILE = (my odb file from buckle), STEP=1 Mode number, scale factor What does the scale factor represent? For example, I want my out of plane displacement(U3) to have an imperfection of...
  3. Entherm

    Negative Slope Load Displacement Curve, Abaqus

    I am using steel with bilinear elastoplastic material. When I apply a compressive load on a beam (wire) element, After yield, I am getting a negative force-displacement curve for U3. What does that mean?
  4. Entherm

    ABAQUS, User MPC

    In Abaqus, when the documentation says "can generate linear as well as nonlinear constraints" for MPC subroutine, does that mean, it is for Non-Linear material regime?
  5. Entherm

    Inactive DOF ABAQUS

    In the Abaqus, I have a beam and column made of shell elements (S4R). They are connected with Tie constraint. When I run the analysis, there are node sets under "WarnNodeBCInactiveDOF" and those are the ones at the connection between beam and column. What might be the reason for this? This is...
  6. Entherm

    ABAQUS-Connection/Interaction

    What could be the best way to connect the 3D wire beam with the solid surface? Initially, I tried using MPC Beam or Kinematic Coupling from the Interaction module but I am not getting expected results from these constraints. There is some space between the two plates.
  7. Entherm

    ABAQUS-Equation Constraint

    In ABAQUS, if we define 5 equation constraints such that we restrain 2,3,4,5,6 degrees of freedom, shouldn't the U2, U3, UR1, UR2, and UR3 for the nodes be equal given that Poisson's ratio is 0?
  8. Entherm

    ABAQUS-Local Co-ordinate System in Kinematic Coupling

    In the below figure, the local axis is defined such that the X is parallel to the longitudinal axis of the left beam. In ABAQUS, if I define kinematic coupling say constrain U1 with the master for left beam and slave for right beam, will U1 still be the axial/longitudinal axes for the left beam...
  9. Entherm

    ABAQUS, Position Constraints

    Do position constraints (like face to face, coincident, coaxial) for instances in assembly make a difference in the Abaqus analysis?
  10. Entherm

    ABAQUS Kinematic Coupling

    Does kinematic coupling work for nonlinear material properties in ABAQUS?
  11. Entherm

    ABAQUS; Bilinear Force Displacement Curve

    In the ABAQUS, my member is a beam 127.5625 in. long with a uniform rectangular cross-section of 3.5 in2. I input a bilinear steel property with true stress of 42.06 ksi, plastic strain 0, and ultimate true stress of 72 ksi and plastic strain 0.18. This came from a yield point of 42 ksi and...
  12. Entherm

    ABAQUS; Weird U3 results

    In my ABAQUS, I have two beams and have applied axial compression to one of the beams. Both the beams have the same non-linear material property but different geometric properties. The other beam interacts with the first beam (the one in which the load was applied) by the following interaction...
  13. Entherm

    Kinematic Coupling ABAQUS

    In ABAQUS, if we apply kinematic coupling between two nodes, say node 1 is master and node 2 is a slave, and constrain U2 and U3, shouldn't U2 for node 1 = U2 for node 2 and U3 for node 1 = U3 for node 2 be true?
  14. Entherm

    Coupled Wire Beams

    I have two wire beams parallel to each other, they are at an angle with horizontal. I tried coupling the U2, U3, UR1, UR2, and UR3 using a local coordinate system with nodes on one beam as controlling and nodes on the other as slave. They are aligned in elastic range but seem to not move...
  15. Entherm

    Wire Beam and Solid

    I tried connecting the end of a wire beam to a solid using an MPC beam constraint. The analysis runs fine in linear range but doesn't give expected results in a non-linear material regime. Can someone help me understand how I should connect those two?
  16. Entherm

    ABAQUS Kinematic Coupling

    Hello, I have been trying to connect beam(wire) to the surface of a solid element. I used a kinematic coupling with the tip of the beam as master and the surface of solid as a slave, and it seems to be working fine in the linear range. But if I input non-linear material properties to the beam...

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