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Recent content by tulbo

  1. tulbo

    ELEMENT STIFFNESS MATRIX

    Hi Thanks for your reply. My confusion was because after using the subroutine, the stresses are computed correctly at the integration points but the strains are not. I thought that in FEM the order of solution is (i) nodal disp> strains> stresses. So, I was wondering how the stresses are correct...
  2. tulbo

    USDFLD GIVES INACCURATE VALUES OF STRAIN!

    Hi, I urgently need some with my subroutine in USDFLD. I am modelling a stiffness dependency on mean stress (E= f(s11+s22+s33)). I enter in a table the values of Young's modulus and the related field variable (pressure). I have tried many things but somehow the subroutine gives incorrect...
  3. tulbo

    ELEMENT STIFFNESS MATRIX

    Hi, I am using USDFLD and a solution dependent field variable to specify the variation of elastic modulus (fieldv=pressure=s11+s22+s33 in my case). Then how is the element stiffness matrix computed at beginning of each load increment? The material properties are a function of the field...
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