December 3, 2020 at 3:10 pmDadojinSubscriberhello,nI want to run certain nonlinear (geometrically and material) analysis of a steel structure.nFor this, I want to use multilinear material model (isotropic hardening)nI have a stress-strain relation defined - in the true stress and logarithmic strain (as there will be large deformations involved)nHowever, because of the necessity to input the stress-strain relation in true-log values, the relation in the tension and compression differs.nhow can I define a different stress-strain relation for compression and for tension with a multilinear material model and Mises plasticity?.thank you,nkind regards,nDanieln
December 9, 2020 at 2:16 amKaiAnsys EmployeeHi Dan, you can look at cast iron material model. It allows different behaviors in tension and compression directions.n
January 10, 2021 at 6:46 pmDadojinSubscriberhello Kai,nnThank you for the advicennHowever it seems to only allow weaker response in tension. I would need to define otherwise.nnfor example (from ansys example 4.19 cast iron):n/prep7nmp, ex, 1,14.773E6nmp,nuxy, 1,0.2273nn! Define cast iron modelnTB,CAST,1,,,ISOTROPICnTBDATA,1,0.04nnTB,CAST,1,1,5,TENSIONnTBPT,,0.000E-00,0.813E+04nTBPT,, 1.13E-04,0.131E+05nTBPT,, 8.69E-04,0.241E+05nTBPT,, 1.55E-03,0.288E+05nTBPT,, 2.32E-03,0.322E+05nnTB,CAST,1,1,5,COMPRESSIONnTBPT,,0.000E-00,0.300E+05nTBPT,, 1.62E-03,0.500E+05nTBPT,, 4.07E-03,0.581E+05nTBPT,, 6.56E-03,0.656E+05nTBPT,, 9.26E-03,0.700E+05nthat is working, but for example this one is not working (the macro below has been altered the way i have copied the compressive data into the tensile and risen the stress values a bit):n/prep7nmp, ex, 1,14.773E6nmp,nuxy, 1,0.2273nn! Define cast iron modelnTB,CAST,1,,,ISOTROPICnTBDATA,1,0.04nnTB,CAST,1,1,5,TENSIONnTBPT,,0.000E-00,0.350E+05nTBPT,, 1.62E-03,0.550E+05nTBPT,, 4.07E-03,0.620E+05nTBPT,, 6.56E-03,0.732E+05nTBPT,, 9.26E-03,0.785E+05nnTB,CAST,1,1,5,COMPRESSIONnTBPT,,0.000E-00,0.300E+05nTBPT,, 1.62E-03,0.500E+05nTBPT,, 4.07E-03,0.581E+05nTBPT,, 6.56E-03,0.656E+05nTBPT,, 9.26E-03,0.700E+05nIf i conduct a one element test, the response in this second case is just the same, for bot, tension and compression. However higher stresses should be achieved in case of tension.nnthank you,nregards,nDaniel
- The topic ‘How to define different relation in compression and tension for steel material?’ is closed to new replies.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- How to do the frequency response of the nonlinear vibration of a flexible PCB?
- Importing Line and Solid Bodies from SpaceClaim to Mechanical
- how to open SendCommand in Ansys
- problems facing during solution
- Still facing the same issue
- Failed to move file from solver directory to scratch directory: file.rst
- Adaptive Sizing
- Stiffness factor
- Import DAT file
- Import pressure data (coordinates and value) to ansys workbench through excel
© 2023 Copyright ANSYS, Inc. All rights reserved.