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ank

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  1. ank liked a post in a topic by Q.Nguyen-Dai in Stress singularity in chassis 2D analysis.   
    If the stress is very "local", found in very small area, it's purely NUMERICAL, NO PHYSICAL. You can ignore.
  2. ank liked a post in a topic by Q.Nguyen-Dai in Difference in stress contours in Shell and hex elements   
    No.
    Max/Min/Average in case of shell stress will be computed between layers.
    To be comparable, you have to compare solid stress of upper face to shell stress of upper layer, and so on.
     
  3. dhananjay1308 liked a post in a topic by ank in Joining 2D mesh to 3D mesh   
    Hello Everyone,
     
    I have been trying since very long on this problem but couldn't find a proper solution. I am experimenting on simple models to see whether the load between the shell and solid is transferred correctly or not. I have considered following three cases:
     A plate (100 mm * 100 mm * 8 mm) modeled completely with hex elements Same plate modeled completely with shell elements Half of the plate modeled with hex elements (from fixed end) And remaining half with shell elements The actual problem is the 3rd case, and to verify it's results, 1st two cases are being studied. I have tried different approaches (such as with skin elements, tie contact, penetration) but the answers were not matching with the 1st two cases. [The max. von mises stress in the 1st case =5.2e-1 MPa , and max. displacement in 1st case = 1.43e-2 mm ] 
     
    The plate is fixed with a cantilever support and the force is applied at the free end (shown in the attached force - time graph )
     
    Anybody please get me solved the .hm file attached herewith in the radioss solver. I also want to solve and test the results using RBE2 and RBE3 elements, but I don't know how to use them at the join between 2D and 3D mesh in my case. It would be of great help if the use of RBE2 and RBE3 would be demonstrated.
     
       
    ScaledUp_2D-3D_8mm.hm

  4. frzti liked a post in a topic by ank in Contact definition and Type 7   
    TYPE = SLIDE (default) will allow the contact surfaces to transfer pressure (contact closed), but it will not transfer anything under tension (contact open). For lateral forces, the SLIDE option will transfer loads until the sliding phase (lateral force > friction coefficient x pressure)
     
    TYPE=STICK is interpreted in OptiStruct as an enforced stick condition - such contact interfaces will not enter the sliding phase. The contact will still iterate to transfer pressures with an "infinite friction" coefficient and can also iterate to re-open, if tension forces occur at a later iteration (unlike the "no separation" option known from 3rd party solvers).
     
    TYPE=STICK is interpreted in OptiStruct as an enforced stick condition - such contact interfaces will not enter the sliding phase. Also, rotations at the slave node are matched to the rotations of the master patch. The FREEZE condition applies to all respective contact elements, no matter whether open or closed.
    This means basically, that the two contact surfaces are "glued" and will transfer all loads / motions between master and slave (also known as Tied Contact). Usecase is to connect two parts entirely.
  5. rastgar650 liked a post in a topic by ank in Error ID 760   
    It is very general error and may be  the error is due to contact.
  6. bRook liked a post in a topic by ank in Connection to be given for bearing   
    How to give correct bearing connection ?If i do not want to have detail analysis of bearing ?
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