how to define a material with density that vary with position

- June 10, 2023 at 7:50 am
  
  stringinging000
  Subscriber
  
  How can I define a material with mass density that vary with position in ls-dyna? Thank you.
- June 12, 2023 at 4:47 pm
  
  Jim Day
  Ansys Employee
  
  See *LOAD_DENSITY_DEPTH. If that doesn't suffice, elaborate on your application and intent.
- June 16, 2023 at 7:04 am
  
  stringinging000
  Subscriber
  
  Thanks, but the keyword *LOAD_DENSITY_DEPTH can only define the density vary with depth. can i define the density vary with the position more complex. For example, density varies with both the coordinates x, y, and z.
- June 16, 2023 at 3:21 pm
  
  Jim Day
  Ansys Employee
  
  By using *INITIAL_STRESS_SOLID, you can set the initial state of each element. That would include stresses and optionally material history variables and/or initial volume (IVEFLG=1). I haven't tested this approach but perhaps the initial density can be manipulated via the initial volume.