hexagon logo
Register Sign in
  • State Not Answered
  • Replies 3 replies
  • Subscribers 5 subscribers
  • Views 56 views
  • Users 0 members are here
Options
Related

For Modified Newton-Raphson method and Full Newton-Raphson method

denzel.li
How does Marc uses these two kind of methods during calculation? Does these two kind of methods ​have a effect on final result?
In my opinion, these two methods  only influence the convergence rate and  if the calculation convergenced then the result should be similiar. I do a comparation test by changing this option in Marc, and the result shows big difference.
Thanks.
Parents
  • 0
    Hi Ddenzel,
     
    In the Full Newton-Raphson method, The tangent stiffness matrix is reformulated for each iteration (recycle).
     
    In the Modified Newton-Raphson method, the tangent stiffness matrix is formulated only once per increment.  
     
    If contact or sudden material nonlinearities occur, reassembly cannot be avoided. The modified Newton-Raphson method is effective for large-scale, only mildly nonlinear problems. When the iterative solver is employed, simple back substitution is not possible, making this process ineffective. In such cases, the Newton-Raphson method should be used instead.
     
    If you are expecting contact and material nonlinearities, then use the default N-R method.
     
    Regards,
    Kiran
Reply
  • 0
    Hi Ddenzel,
     
    In the Full Newton-Raphson method, The tangent stiffness matrix is reformulated for each iteration (recycle).
     
    In the Modified Newton-Raphson method, the tangent stiffness matrix is formulated only once per increment.  
     
    If contact or sudden material nonlinearities occur, reassembly cannot be avoided. The modified Newton-Raphson method is effective for large-scale, only mildly nonlinear problems. When the iterative solver is employed, simple back substitution is not possible, making this process ineffective. In such cases, the Newton-Raphson method should be used instead.
     
    If you are expecting contact and material nonlinearities, then use the default N-R method.
     
    Regards,
    Kiran
Children
No Data
© 2025 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement