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Joel Rodarte

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  1. Rahul R liked a post in a topic by Joel Rodarte in How is VonMises strain output in hyperview calculated by Optistruct?   
    This was what I was searching for!
    Thank you Farouk!
  2. Joel Rodarte liked a post in a topic by Sai Vignesh in RB2 vs RB3   
    Hi Joel
    RBE 2 has infinite stiffness which holds component 2 components tightly
    Whereas RBE3  doesnt add any stifness used for load and mass transfer.
    Also rbe 2 can also used for load and mass transfer but rbe2 has stiffnesss component to it
  3. Joel Rodarte liked a post in a topic by Hyperman in CONTPRM card?   
    Ctrl+F search for any keyword (input in the upper right corner).

    Use PREPRT>YES to output .CPR file.
  4. Joel Rodarte liked a post in a topic by Rahul R in Pretension Analysis Error Optistruct   
    Could you please share the .out file of the run?
    Note: Pretension can be modeled with either 1D or 3D bolts.

  5. Joel Rodarte liked a post in a topic by Rahul R in Non Linear Iterations and convergence doubt!   
    OptiStruct solves nonlinear set of equations with an implicit solution technique
    OptiStruct uses the incremental-iterative procedure based on Newton’s method The applied load is broken down into small increments For each of the small increments of load an approximate solution is obtained Several iterations may be required to obtain a sufficiently accurate approximate solution  
    OptiStruct checks for convergence on three fronts U,P, and W (Displacement, Load and Work)
    Measures error in the nonlinear solution against a predetermined tolerance level The default error tolerances for the convergence criteria are 0.001 for displacement ,load & 1.0E-7 for work/strain It is not generally recommended to change the default values. However, varying the tolerances or excluding one or more criteria may affect the result accuracy Nonlinear expert system
    PARAM, EXPERTNL, AUTO (default)/YES/CNTSTB/NO The expert system monitors the convergence of nonlinear processes and tries to improve the convergence for poorly converging cases “YES” activates an ‘expert system’ that aids in the convergence. Possible actions like performing additional iterations, under-relaxation, automatic adjustment of the load increment, backing off to the last converged solution and retrying. May lead to a large number of nonlinear iterations. “AUTO” activates a ‘light’ version of the expert system which facilitates converging nonlinear process in reasonably close to minimum number of iterations. CNTSTB” introduces temporary stabilization on contact interfaces to improve nonlinear convergence
  6. Joel Rodarte liked a post in a topic by Rahul R in How can I read superficial stresses on 3D castings? How are ´Membrane´ elements declared in Optistruct?   
    You can model the shell as membrane, by setting the MID2/3=0.0 (basically we are reducing the bending stiffness to zero, it will act like a membrane). which we can do by editing the PSHELL property card. 
  7. Joel Rodarte liked a post in a topic by Q.Nguyen-Dai in Elemental System, Global System, Analysis System   
    Beam forces are presented always within Elemental system. No sense to show them in Global system.
  8. Joel Rodarte liked a post in a topic by Rahul R in What does an "Element process ID" reference to in Optistruct?   
    Please share .out file of the run?
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