Hi, I want to Modal Analysis of cantilever membrane made of Hyperviscoelastic material using ANSYS Workbench. I am able to perform separate modeling using Mooney Rivlin for hyperelastic and Prony series for viscoelastic cases. How can I use BB or any other hyperviscoelastic model in workbench for analyzing the combined case? -------------------------------------- Thank you, David.

You are missing your affiliation - required by XANSYS rules. A modal analysis is, by its nature, linear. Non-linear hyperelastic models etc have to be linearised. Have a look at linear perturbation analysis in the manual - chapter 9 in the structural analysis guide. In WB have a look at prestress modal analyses. Andrew Sims ResMed Ltd. -----Original Message----- From: Xansys-temp [mailto:xansys-temp-bounces@xansystest.info] On Behalf Of David Kumar Sent: Thursday, 29 September 2016 4:08 AM To: xansys-temp@xansystest.info Subject: [Xansys] [XANSYS] Hyperviscoelastic modeling using ANSYS Workbench Hi, I want to Modal Analysis of cantilever membrane made of Hyperviscoelastic material using ANSYS Workbench. I am able to perform separate modeling using Mooney Rivlin for hyperelastic and Prony series for viscoelastic cases. How can I use BB or any other hyperviscoelastic model in workbench for analyzing the combined case? -------------------------------------- Thank you, David. _______________________________________________ Xansys-temp mailing list Xansys-temp@xansystest.info http://xansystest.info/mailman/listinfo/xansys-temp_xansystest.info 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 Warning: Copyright ResMed. Where the contents of this email and/or attachment includes materials prepared by ResMed, the use of those materials is subject exclusively to the conditions of engagement between ResMed and the intended recipient. This communication is confidential and may contain legally privileged information. By the use of email over the Internet or other communication systems, ResMed is not waiving either confidentiality of, or legal privilege in the content of the email and of any attachments. If the recipient of this message is not the intended addressee, please call ResMed immediately on +61 2 8884 1000 Sydney, Australia.

On Sep 28, 2016, at 1:07 PM, David Kumar wrote: > I want to Modal Analysis of cantilever membrane made of Hyperviscoelastic > material using ANSYS Workbench. Modal analysis doesn't work for non-linear materials. You might be able to run a restarted modal analysis after applying a load to your model, but the material properties will be constant. You 'd be assuming small displacements about the loaded configuration. Check your first principles. 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/ wo

As my noble colleagues said, modal analysis is in nature linear. If You have noticable nonlinearities instead linearising them, You can try one of following: - Try perturbation method (http://www.padtinc.com/blog/the-focus/ansys-13-0-enhanced-modal-analyses-with-linear-perturbation) - Trainsient structural, explicit or implicit, that then FFT the time response - Use APLD Math to obtain iteratively special case of modal solution. Some starting point to do this will be equations and examples: http://www.iust.ac.ir/files/mech/ahmadian_977db/pdf/MT_lectures_1-10.pdf http://www.ltas-vis.ulg.ac.be/cmsms/uploads/File/C85_2011_Corfou_NNM.pdf and of course good APLD MATH basics http://www.padtinc.com/blog/the-focus/apdl-math-access-to-the-ansys-solver-matrices-with-apdl http://resource.ansys.com/staticassets/ANSYS/staticassets/resourcelibrary/article/AA-V6-I2-Introducing-APDL-Math-Commands.pdf The last method is what You probably desire, unfortunatelly this solution is not for Workbench user but accesible in MAPLD. -- # Przemyslaw Siedlaczek # # Bombardier Transportation (ZWUS) Polska Sp. z o.o. # Office: ul. Modelarska 12, 40-142 Katowice, Polska/Poland # Tel +48 (32) 730 50 00, Fax +48 (32) 204 22 44 Dnia 28 września 2016 20:07 "David Kumar" <david@iitk.ac.in> napisał(a): > Hi, > > I want to Modal Analysis of cantilever membrane made of Hyperviscoelastic > material using ANSYS Workbench. I am able to perform separate modeling using > Mooney Rivlin for hyperelastic and Prony series for viscoelastic cases. How > can I use BB or any other hyperviscoelastic model in workbench for analyzing > the combined case? > > > > -------------------------------------- > > Thank you, > > David. > > _______________________________________________ > Xansys-temp mailing list > Xansys-temp@xansystest.info > http://xansystest.info/mailman/listinfo/xansys-temp_xansystest.info > 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 >