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'Static, General' Vs. 'Static, Riks' load step

thread799-186051

'Static, General' Vs. 'Static, Riks' load step

'Static, General' Vs. 'Static, Riks' load step

(OP)
Can someone please outline the difference between the 'static, general' and 'static, Riks' loading method. As I understand it, general takes the load and breaks it into increment applying each one on the result of the previous increment whereas Riks computes the difference between the increments and then adds this to the previous increment however I'm struggling to grasp this.

Any help appreciated.

Regards

Tom

RE: 'Static, General' Vs. 'Static, Riks' load step

Hi Tom

Riks is best suited to problems where there is unstable buckling or collapse - it uses an arc-length method to determine the response of the loaded structure, where there are siginificant changes in the structure's stiffness.

Regards

Martin

RE: 'Static, General' Vs. 'Static, Riks' load step

Indeed as bassamanjax  indicates.. In other words Riks has computational technique to handle the decreasing part  of the deformation-load curve (zero or negative stiffness) while General Static will diverge in this case

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