Hi there, I am looking into low-cycle fatigue and nonlinear kinematic hardening material (Chaboche). I don’t have access to test data for multiple cycles and strain levels, so I wonder if there is there any reference data available for standard steel types, like S355 and similar? Also, are there rules of thumb for when the risk of ratchetting can be disregarded (in terms of observed plastic strain levels, for instance)? As in: When can I justify just using MKIN material (Ramberg-Osgood, as referenced in DNV RP-C208)? Thanks, Uffe Dal Eriksen Ramboll Energy Denmark.

Hi Uffe, No self-respecting metalurgist will give you 'standard' post-yield behaviour of materials because this behaviour depends on the processing history of the material.  If you want non-conservative data, you must test your own material. Regards, Jane. On 20/12/2023 08:16, Uffe Dal Eriksen via Xansys wrote: > Hi there, > > I am looking into low-cycle fatigue and nonlinear kinematic hardening material (Chaboche). > > I don’t have access to test data for multiple cycles and strain levels, so I wonder if there is there any reference data available for standard steel types, like S355 and similar? > > Also, are there rules of thumb for when the risk of ratchetting can be disregarded (in terms of observed plastic strain levels, for instance)? As in: When can I justify just using MKIN material (Ramberg-Osgood, as referenced in DNV RP-C208)? > > Thanks, > > Uffe Dal Eriksen > > Ramboll Energy > > Denmark. > _______________________________________________ > Xansys mailing list --xansys-temp@list.xansys.org > To unsubscribe send an email toxansys-temp-leave@list.xansys.org > If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS toxansys-mod@tynecomp.co.uk and not to the list -- Jane Clark 122 Manor Way Risca Newport NP11 6AD 07766 464429

Hi Uffe, I found this on the web. Ain’t sure if this is what you are looking for but maybe worth looking into it. https://www.hindawi.com/journals/amse/2016/7863010/ Good luck! Mohammad ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 ===================================== On Wed, 20 Dec 2023 at 11:19 AM Uffe Dal Eriksen via Xansys < xansys-temp@list.xansys.org> wrote: > Hi there, > > I am looking into low-cycle fatigue and nonlinear kinematic hardening > material (Chaboche). > > I don’t have access to test data for multiple cycles and strain levels, so > I wonder if there is there any reference data available for standard steel > types, like S355 and similar? > > Also, are there rules of thumb for when the risk of ratchetting can be > disregarded (in terms of observed plastic strain levels, for instance)? As > in: When can I justify just using MKIN material (Ramberg-Osgood, as > referenced in DNV RP-C208)? > > Thanks, > > Uffe Dal Eriksen > > Ramboll Energy > > Denmark. > _______________________________________________ > Xansys mailing list -- xansys-temp@list.xansys.org > To unsubscribe send an email to xansys-temp-leave@list.xansys.org > If you are receiving too many emails from XANSYS please consider changing > account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list

Hello Uffe, I think your problem could be split (at least) into three fundamental parts: 1) Find Stress-Strain data for S355 (don’t focus on Chaboche at this point). There is good stuff out there, e.g.: https://link.springer.com/content/pdf/10.1140/epjst/e2018-00113-4 2) Having found a suitable Stress-Strain Curve (or measuring it), you can do a curve fitting using a mix of regression and optimization techniques, as this one: https://iopscience.iop.org/article/10.1088/1757-899X/119/1/012020 3) I have written a Python script some time ago that uses scipy least squares method. It works like a charm. The Scipy optimization library is quite robust. 4) Next you’d have to get a EN curve from somewhere like the Boller & Seeger compendium. I think 5 of them have been published under the title: “Materials Data For Cyclic Loading”. Good luck! And Merry Christmas! Best Regards, Giovanni DE MORAIS SIMULIA Technology Manager Senior Specialist giovanni.demorais@3ds.com<mailto:Giovanni.DEMORAIS@3ds.com> [3DS Logo] 3DS.COM/SIMULIA<http://www.3ds.com/SIMULIA> Dassault Systemes UK Limited | City Gate, 8 St Marys Gate | S1 4LW Sheffield | United Kingdom From: Uffe Dal Eriksen via Xansys <xansys-temp@list.xansys.org> Sent: Wednesday, December 20, 2023 8:17 AM To: xansys-temp@list.xansys.org Cc: ude@ramboll.com Subject: [Xansys] Chaboche material data? Hi there, I am looking into low-cycle fatigue and nonlinear kinematic hardening material (Chaboche). I don’t have access to test data for multiple cycles and strain levels, so I wonder if there is there any reference data available for standard Hi there, I am looking into low-cycle fatigue and nonlinear kinematic hardening material (Chaboche). I don’t have access to test data for multiple cycles and strain levels, so I wonder if there is there any reference data available for standard steel types, like S355 and similar? Also, are there rules of thumb for when the risk of ratchetting can be disregarded (in terms of observed plastic strain levels, for instance)? As in: When can I justify just using MKIN material (Ramberg-Osgood, as referenced in DNV RP-C208)? Thanks, Uffe Dal Eriksen Ramboll Energy Denmark. _______________________________________________ Xansys mailing list -- xansys-temp@list.xansys.org<mailto:xansys-temp@list.xansys.org> To unsubscribe send an email to xansys-temp-leave@list.xansys.org<mailto:xansys-temp-leave@list.xansys.org> If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day. Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk<mailto:xansys-mod@tynecomp.co.uk> and not to the list This email and any attachments are intended solely for the use of the individual or entity to whom it is addressed and may be confidential and/or privileged. If you are not one of the named recipients or have received this email in error, (i) you should not read, disclose, or copy it, (ii) please notify sender of your receipt by reply email and delete this email and all attachments, (iii) Dassault Systèmes does not accept or assume any liability or responsibility for any use of or reliance on this email. Please be informed that your personal data are processed according to our data privacy policy as described on our website. Should you have any questions related to personal data protection, please contact 3DS Data Protection Officer https://www.3ds.com/privacy-policy/contact/