## subroutine USDFLD

## subroutine USDFLD

(OP)

Hello, everyone! I have a big problem I'm not solving.

I should enter the value of the variable mass density with the space on abaqus. I was able to insert the variable Young's module in the space with both UMAT and USDFLD. Unfortunately, I can't as far as mass density is concerned. Do you have any suggestions or ideas?

Thank you in advance.

I should enter the value of the variable mass density with the space on abaqus. I was able to insert the variable Young's module in the space with both UMAT and USDFLD. Unfortunately, I can't as far as mass density is concerned. Do you have any suggestions or ideas?

Thank you in advance.

## RE: subroutine USDFLD

## RE: subroutine USDFLD

I enclose both the one with Young's variable modulus and the one with mass density. The first one works, because the stiffness matrix is the same as the one calculated on another program. While, in that of the density of variable mass in space, the matrix of the masses is completely wrong because Abaqus considers me the mass equal to 1.

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

## RE: subroutine USDFLD

How would you try to solve this problem? Thank you so much!

## RE: subroutine USDFLD