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Found 4 results

  1. Hi everyone, I am writing here hoping someone can help me with the following problem. I have a plate which is connected to one end of a flexural spring (0.8mm thick) through FREEZE contact (please see picture below). The other spring end is fixed. I have used 2 loadsteps to perform this analysis: The plate has to translate downwards of about 1.4 mm. LGDISP non linear static analysis activated. From the position reached in the previous point, the plate must rotate about the X axis of an angle 0.25° (DOF4).LGDISP non linear static analysis activated. All displacements have been enforced through SPC. Picture of the model: I have used CNTNLSUB in order to make one subcase follow the other. Unfortunately, from other threads in this forum, I seem to have guessed the 1st loadstep loads (SPC enforced displacements in this case) must be enforced in 2nd loadstep as well. This proves to be impractical, since my final goal is to simulate bending+torsion in the flexural spring. In fact, I cannot impose the desired rotation in the 2nd loadstep because the plate has to be forced to translate downwards like it is in the 1st loastep. I am attaching my file in order to get the matter as clear as possible. Thank you in advance for any help you will wish to provide. Best Regards Matteo Spring_Plate.fem
  2. Hello, I don't know when to use the option LGDISP in the PARAM-Card. The stresses at a simple beam without LGDISP are about 480 MPa, and with LGDISP just 230 MPa. The ultimate displacement of the component is about 22mm, so I don't think that LGDISP is required here. Can you please explain me, when this option should be activated? Greets Tom
  3. Hello, I tried to run a job containing PCOMP and a hyperelastic solid modelized with MATHE card. I use a NLSTAT analysis. The run is ok in small displacement but when I use LGDISP I got the following error : *** FATAL ERROR # 3215 *** PCOMP in conjunction with PARAM, LGDISP is not supported. How can I do to perform large displacement analysis with PCOMP and hyperelastic components ? Thank you
  4. Oli

    LGDISP

    Hello, I have a Model with 2 Load Steps. I applied a force just in one direction with differnet magnitude . For load step 1 =4000N and for load step 2= 10000N. (I do not use CNTNLSUB) I wonder, why the force vs. displacement curve is not equal for both load steps until 4000N. So the stresse are actually also not equal at the same force magnitude. Do somebody has an idea? Attached a Diagram of the 2 curves (force vs displacement), and the model files .fem and .h3d kleines_Loch__plastisch.h3d
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