unit of strain in hyperelastic test data

- July 29, 2019 at 4:16 pm
  
  Jirong
  Subscriber
  
  Hi All,
  
  I am trying to input my own biaxial test data (stress and strain) into EngineeringData, but I found that the unit for strain in the interface is mm^-1. Shouldn't the unit for strain is mm/mm or in/in....?
  
  Another question is, is there anyway to perform curve fitting for some anisotropic materials? I saw the material models that are supported in ANSYS to do curve fitting are mostly isotropic hyperelastic.
  
  Thanks!
  
  Jirong
- July 29, 2019 at 4:27 pm
  
  Sandeep Medikonda
  Ansys Employee
  
  You are correct and if you look closely there is a space between m and m^-1 ....so this m/m....if you change the units to mm...it would look mm mm^-1 or in other words mm/mm
  
  Also, we don't support curve fitting anisotropic materials, it's a elaborate process and has to be done outside ANSYS
- July 29, 2019 at 4:59 pm
  
  Jirong
  Subscriber
  
  Understood! Thanks.
  
  Jirong
- November 25, 2020 at 4:33 pm
  
  wiki157
  Subscriber
  
  Hi,nI would like to know if this strain is supposed to be engineering strain?nThanks,nWikin