What the ERROR_STR(%) on solution output(result tab)?

General Questions
1

Hi all,

I don’t understand what the ERROR_STR(%) on solution output(result tab) means.

I’m not sure why it’s appearing without having to specify ERR or ZZS in the *EL FILE card.
(EER and ZZS mutually exclusive.)
According to the manual, there are only EER and ZZS error estimators options.

Best regards,

2

Check the 6.12 Error estimators chapter of the CalculiX User’s Manual. STR stands for error in principal stress in a node.

3

Thanks for your response.

STR is different from ERR and ZZS, isn’t it?
ERR is a gradient error estimator, isn’t it?

STR stands for error in principal stress of the integration points belong to a certain node,isn’t it?

Best regards,

4

ERR is requested as element output to obtain STR. ZZS is another error measure - Zienkiewicz-Zhu stress. Its description can be found in the documentation chapter 6.12.1 Zienkiewicz-Zhu error estimator.

STR uses principal stresses from integration points of elements sharing the same node.