Evaluation of stiffness matrix at iteration ith - Newton-Raphson method

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  • Last Post 23 September 2019
Gennaro posted this 19 September 2019

Hello everyone,

I'd like to know how Ansys computes the stiffness matrix at point x1 in figure. I'm studying the way in which Ansys uses the Newton-Raphson method when there are nonlinearities.

In the slide there is the specification that we don't know the real curve F-x, thus I have some problem to understand which slope is taken at x1 by Ansys.

Thank you so much for your time.

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SandeepMedikonda posted this 19 September 2019

The Newton-Raphson procedure is discussed here.

How to access the ANSYS Online Help

Gennaro posted this 19 September 2019

 Hello SandeepMedikonda, I am using Ansys on the computers in my university, thus I cannot access to the links which you attached.

Can you send me the discussion by another way please?

peteroznewman posted this 22 September 2019

 Gennaro, do you mean that when you click on the first link Sandeep provided, it asked you to log into the Customer Portal?

You have to follow the instructions in the second link Sandeep provided, which explains how to get to the help page in the first link.

Here is the first link as plain text:

https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v195/ans_thry/thy_tool10.html

Gennaro posted this 23 September 2019

Hello Peter, thank you for your help; i'll try to follow the instructions.

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