The effective strain (EFF_STN) does include plastic strain or not?
Dear All,
I am using Ansys Explicit Dynamic (AutoDYN) for analysing of a bilinear hardening material under a complex loading. I think that ''effective strain'' is cumulative (integral over time) form of the ''equivalent strain''. Could you please kindly let me know that the effective strain (EFF_STN) does include plastic strain or not? I would greatly appreciate it if you could mention a reference also.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student
Research Unit of Medical Imaging, Physics and Technology (MIPT)
Faculty of Medicine, University of Oulu
[oulun+yliopisto_logo_fin_rgb14_tt]
From the help it seems like it's the overall strain (plastic+elastic) as it is the "Effective Geometric Strain of a cell", in my understanding it means deltaL/L, without distinction of plastic or elastic.
See https://www.sharcnet.ca/Software/Ansys/17.0/en-us/help/exd_ag/ds_user_defined_exp_dynamics.html (older version but prolly didn't change between versions)
Atenciosamente,
Best regards,
Tiago José Medeiros de Araújo Lira
Engenheiro Mecânico
Mechanical Engineer
[cid:0x58e3824.0xe162717e.0xf970ffc.0xbec231cd4bc5751993b94dbe]
[X]
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A 8 de maio de 2019 10:11:22, Shahab Khakpour Shahab.Khakpour@oulu.fi escreveu:
Dear All,
I am using Ansys Explicit Dynamic (AutoDYN) for analysing of a bilinear hardening material under a complex loading. I think that ''effective strain'' is cumulative (integral over time) form of the ''equivalent strain''. Could you please kindly let me know that the effective strain (EFF_STN) does include plastic strain or not? I would greatly appreciate it if you could mention a reference also.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student
Research Unit of Medical Imaging, Physics and Technology (MIPT)
Faculty of Medicine, University of Oulu
[oulun+yliopisto_logo_fin_rgb14_tt]
Thank you so much for your prompt answer. I had checked the page out, but it does not mention clearly that does it include plastic strain or not. I think like you, it should include all strain except thermal one.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student
Research Unit of Medical Imaging, Physics and Technology (MIPT)
Faculty of Medicine, University of Oulu
[oulun+yliopisto_logo_fin_rgb14_tt]
From: Tiago José Medeiros de Araujo Lira tiago.lira@easbr.com
Sent: keskiviikko 8. toukokuuta 2019 16.23
To: XANSYS Mailing List Temporary Home xansys-temp@xansystest.info; Shahab Khakpour Shahab.Khakpour@oulu.fi
Subject: Re: [Xansys] The effective strain (EFF_STN) does include plastic strain or not?
From the help it seems like it's the overall strain (plastic+elastic) as it is the "Effective Geometric Strain of a cell", in my understanding it means deltaL/L, without distinction of plastic or elastic.
See https://www.sharcnet.ca/Software/Ansys/17.0/en-us/help/exd_ag/ds_user_defined_exp_dynamics.html (older version but prolly didn't change between versions)
Atenciosamente,
Best regards,
Tiago José Medeiros de Araújo Lira
Engenheiro Mecânico
Mechanical Engineer
[cid:image002.png@01D505BB.9C8E1C80]
Fone (Phone): +55 81 3311-7458tel:+55%2081%203311-7458
www.estaleiroatlanticosul.com.brhttp://www.estaleiroatlanticosul.com.br/
Ilha de Tatuoca, s/n - Complexo Portuário de Suape
Ipojuca-PE, Brasil, CEP (Zip Code) 55594-900tel:55594-900
EAS Confidencial: 0800 721 5970tel:0800%20721%205970
www.easconfidencial.com.brhttp://www.easconfidencial.com.br/
Email enviado pelo celular
Email sent by phone
A 8 de maio de 2019 10:11:22, Shahab Khakpour <Shahab.Khakpour@oulu.fimailto:Shahab.Khakpour@oulu.fi> escreveu:
Dear All,
I am using Ansys Explicit Dynamic (AutoDYN) for analysing of a bilinear hardening material under a complex loading. I think that ''effective strain'' is cumulative (integral over time) form of the ''equivalent strain''. Could you please kindly let me know that the effective strain (EFF_STN) does include plastic strain or not? I would greatly appreciate it if you could mention a reference also.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student
Research Unit of Medical Imaging, Physics and Technology (MIPT)
Faculty of Medicine, University of Oulu
[oulun+yliopisto_logo_fin_rgb14_tt]
Shabab,
What experiments have you done to figure this out on your own? This is a super simple problem that can be solved in 5 minutes on your own. The best thing to do would be to make a 1 element model and cycle it in tension and compression using some displacement BCs and see what the code reports. Then you won't be relying on an anonymous 'experts' on teh interwebz to solve your problems. And you might learn something about the code in the process.
Aaron C. Caba, Ph.D.
Sr. Principal R&D Engineer
BAE Systems, Inc.
4050 Peppers Ferry Road, Radford VA 24143-0100
www.baesystems.com
-----Original Message-----
From: Shahab Khakpour Shahab.Khakpour@oulu.fi
Sent: Wednesday, May 8, 2019 9:32 AM
To: Tiago José Medeiros de Araujo Lira tiago.lira@easbr.com; XANSYS Mailing List Temporary Home xansys-temp@xansystest.info
Subject: Re: [Xansys] The effective strain (EFF_STN) does include plastic strain or not?
Thank you so much for your prompt answer. I had checked the page out, but it does not mention clearly that does it include plastic strain or not. I think like you, it should include all strain except thermal one.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student Research Unit of Medical Imaging, Physics and Technology (MIPT) Faculty of Medicine, University of Oulu [oulun+yliopisto_logo_fin_rgb14_tt]
From: Tiago José Medeiros de Araujo Lira tiago.lira@easbr.com
Sent: keskiviikko 8. toukokuuta 2019 16.23
To: XANSYS Mailing List Temporary Home xansys-temp@xansystest.info; Shahab Khakpour Shahab.Khakpour@oulu.fi
Subject: Re: [Xansys] The effective strain (EFF_STN) does include plastic strain or not?
From the help it seems like it's the overall strain (plastic+elastic) as it is the "Effective Geometric Strain of a cell", in my understanding it means deltaL/L, without distinction of plastic or elastic.
See https://www.sharcnet.ca/Software/Ansys/17.0/en-us/help/exd_ag/ds_user_defined_exp_dynamics.html (older version but prolly didn't change between versions)
Atenciosamente,
Best regards,
Tiago José Medeiros de Araújo Lira
Engenheiro Mecânico
Mechanical Engineer
[cid:image002.png@01D505BB.9C8E1C80]
Fone (Phone): +55 81 3311-7458tel:+55%2081%203311-7458
www.estaleiroatlanticosul.com.brhttp://www.estaleiroatlanticosul.com.br/
Ilha de Tatuoca, s/n - Complexo Portuário de Suape Ipojuca-PE, Brasil, CEP (Zip Code) 55594-900tel:55594-900 EAS Confidencial: 0800 721 5970tel:0800%20721%205970 www.easconfidencial.com.brhttp://www.easconfidencial.com.br/
Email enviado pelo celular
Email sent by phone
A 8 de maio de 2019 10:11:22, Shahab Khakpour <Shahab.Khakpour@oulu.fimailto:Shahab.Khakpour@oulu.fi> escreveu:
Dear All,
I am using Ansys Explicit Dynamic (AutoDYN) for analysing of a bilinear hardening material under a complex loading. I think that ''effective strain'' is cumulative (integral over time) form of the ''equivalent strain''. Could you please kindly let me know that the effective strain (EFF_STN) does include plastic strain or not? I would greatly appreciate it if you could mention a reference also.
Best regards,
Shahab Khakpour, I4Future Reseracher and Doctoral Student Research Unit of Medical Imaging, Physics and Technology (MIPT) Faculty of Medicine, University of Oulu [oulun+yliopisto_logo_fin_rgb14_tt]
On May 8, 2019, at 8:10 AM, Shahab Khakpour Shahab.Khakpour@oulu.fi wrote:
Could you please kindly let me know that the effective strain (EFF_STN) does include plastic strain or not? I would greatly appreciate it if you could mention a reference also.
Suggest you do a quick Google search on 'effective strain.' You're likely to get half a dozen opinions from XANSYS, which may or may not be consistent or definitive. Which is not meant as criticism—everyone here does their best—but you need definitive. 'Effective' is one of those hazy terms that covers up a lot of nuance. To be sure you understand the definition you should test your understanding by calculating it yourself from a partial listing of the element output from a single element. Next time you'll know exactly.
Christopher Wright P.E. |"They couldn't hit an elephant at
chrisw@skypoint.com | this distance" (last words of Gen.
.......................................| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/members/chrisw/