#1 2022-07-21 14:18:20

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

[SOLVED] Friction spring modelling

Greetings dear colleagues,

I was wondering if someone did manage to implement load/deflection behavior with different stiffness for loading/unloading as shown in the attached picture. Loading and /or unloading stage are assumed linear but not equal. It represents spring rings, with dissipative work due to internal friction.
It could be best to describe behavior just for 1D element, without assembling complex discrete mechanism.

Thank you for your help and ideas.

Regards

Last edited by EnKiNekiDela (2022-09-08 18:51:09)

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Attachments:
Ringfeder_fiction_spring.jpg, Size: 47.44 KiB, Downloads: 86

miib

Member

From: Near Goethe's Palm (Patavium).

Registered: 2021-03-23

Posts: 303

Re: [SOLVED] Friction spring modelling

U2.04.03

code-aster.org/doc/default/en/man_u/u2/u2.04.03.pdf

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Ma NON era chiaro ??? per chiarezza te lo spiego : a Code_Aster mi sono sempre approcciato come suo Studente, e quello che ho mostrato nei mesi passati erano SOLO i miei progressi nello studio. I professori da cui imparare??? li ho scelti da me.

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Re: [SOLVED] Friction spring modelling

U2.04.03

code-aster.org/doc/default/en/man_u/u2/u2.04.03.pdf

Thank you for you fast reply.
I was investigating the possibility of linear kinematic wok hardening, but since I have max. force/displacement 10MN/300mm, I wasn't sure this would work regarding the note from documentation:" This model (like all the models with linear work hardening) risks to over-estimate the constraints in the event of strong deformations, (or to underestimate the deformations with imposed constraint) because nothing limits the curve of work hardening."

Therefore I am searching for alternatives. Maybe I should try and check regardless.

Last edited by EnKiNekiDela (2022-07-21 20:01:37)

miib

Member

From: Near Goethe's Palm (Patavium).

Registered: 2021-03-23

Posts: 303

Re: [SOLVED] Friction spring modelling

code-aster.org/forum2/viewtopic.php?id=26266

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Ma NON era chiaro ??? per chiarezza te lo spiego : a Code_Aster mi sono sempre approcciato come suo Studente, e quello che ho mostrato nei mesi passati erano SOLO i miei progressi nello studio. I professori da cui imparare??? li ho scelti da me.

miib

Member

From: Near Goethe's Palm (Patavium).

Registered: 2021-03-23

Posts: 303

Re: [SOLVED] Friction spring modelling

R5.03.02

code-aster.org/V2/doc/v12/en/man_r/r5/r5.03.02.pdf

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Ma NON era chiaro ??? per chiarezza te lo spiego : a Code_Aster mi sono sempre approcciato come suo Studente, e quello che ho mostrato nei mesi passati erano SOLO i miei progressi nello studio. I professori da cui imparare??? li ho scelti da me.

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Re: [SOLVED] Friction spring modelling

Thank you very much, this should be the answer.

EnKiNekiDela

Member

From: Slovenija

Registered: 2021-11-07

Posts: 24

Re: [SOLVED] Friction spring modelling

After some time searching for the right answer to properly model friction springs, I came to solution of modelling it with simple DIS_CONTACT over SEG2 element, chosing RIGI_NOR, RIGI_TAN, and all other contact material properties properly, according to design requirements and constraining nodes to enable relative travel in desired direction. Attached the force/displacement test diagram.

Last edited by EnKiNekiDela (2022-09-05 11:17:53)

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Attachments:
Friction spring diagram.png, Size: 17.08 KiB, Downloads: 43