Comments

• Victor

  August 2020

  You can enter a piecewise stress-strain curve in CCX -> custom model definition. See the manual section 13.1 Custom model definition for an example using 3 points.
• Hengre

  August 2020

  Thank you for your answer.
  Are there any plans to integrate that oportunity in the Material Properties --> Plastic card
  as new Point:
  Strain-Strss-curve
• Hengre

  August 2020

  I tried your suggestion, but didn't get the expected results :-(
  
  If I follow your suggestion the inp. file contains the following, but it seems nonlinear material is not taken...
  
  ...
  
  *MATERIAL,NAME=Alu
  *ELASTIC,TYPE=ISOTROPIC
  70000000000,0.3
  *DENSITY
  2750
  *MATERIAL,NAME=Stahl
  *ELASTIC,TYPE=ISOTROPIC
  210000000000,0.3
  *DENSITY
  7850
  *MATERIAL,NAME=Kupfer
  *ELASTIC,TYPE=ISOTROPIC
  125000000000,0.3
  *MATERIAL,NAME=Rotguss
  *ELASTIC,TYPE=ISOTROPIC
  95000000000,0.3
  *DENSITY
  8700
  *MATERIAL,NAME=Bronze
  *ELASTIC,TYPE=ISOTROPIC
  111000000000,0.3
  *DENSITY
  8730
  *MATERIAL,NAME=Messing
  *ELASTIC,TYPE=ISOTROPIC
  90000000000,0.3
  *DENSITY
  8500
  *SOLID SECTION,ELSET=innen,MATERIAL=Rotguss
  *SOLID SECTION,ELSET=aussen,MATERIAL=Stahl
  ...
  
  other stuff
  ...
  
  *AMPLITUDE,NAME=Aconstant
  0,1
  *MATERIAL,NAME=Stahl
  *ELASTIC
  210000000000,0.3
  *PLASTIC
  350e6,0
  400e6,0.01
  410e6,0.1
  *DENSITY
  7850
  *MATERIAL,NAME=Kupfer
  *ELASTIC
  125000000000,0.3
  *MATERIAL,NAME=Rotguss
  *ELASTIC,TYPE=ISOTROPIC
  95000000000,0.3
  *PLASTIC
  250e6,0
  300e6,0.01
  310e6,0.1
  *DENSITY
  8700
  *STEP,NLGEOM=YES,INC=100
  *STATIC
• Victor

  August 2020 edited August 2020

  It looks like you already have materials named Stahl and Rotguss which are conflicting with the new ones. Use different names and remove any Mecway-defined materials from the components that are getting the new plastic material.
  
  Don't forget to enter the *SOLID SECTION cards too since Mecway will no longer generate them with no materials on the components.
  
  Yes, I hope to add this to the UI soon to make it easier.
• gemada

  October 2020

  Hi Victor. That would be great. I've been away for a while...can you tell when this feature will be available?
• Hengre

  October 2020

  Hi Victor, I would also apreciate that feature very much and i guess many other's, too
• Victor

  October 2020

  The next version (14) will have a stress-strain curve.
  
  Could you two, and anyone else here, tell me if you prefer the strain input to be plastic strain (0 at yield) like CCX does or total strain (yield strain at yield)?
• mmartin

  October 2020

  I vote for “ total strain. “
• Hengre

  October 2020

  I am not really sure. I am a bit closer to CCX, why I prefere more for CCX definition
• gemada

  October 2020

  Thank you Victor. I'd prefer total strain!
• Sergio

  October 2020

  I prefer to be plastic strain only to keep in line with CalculiX documentation
• MikeMcMullen

  October 2020

  Thank you as well! I would like total strain as well, especially with the recent speedups. Having a linear part to speed up calculations as well as a non-linear part does not seem as important with the speeding up of the computers, solvers, Mecway and Calculix in recent times. Probably more speed up on the way due to larger memory on GPU cards and faster Pcie busses and different (more adaptive) software models. Can't even go get a cup of coffee while waiting for a solution with Mecway and Calculix. Also most of the materials I use are not precisely linear at all (carbon fiber is close), just defined that way by code to simplify calculations.
• gemada

  October 2020

  Hi. Could we get both?
• Hengre

  October 2020

  make it selectable :-)