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Recent content by mami826

  1. mami826

    getting the same results while mesh size is changing-UMAT

    Hi All, I am modelling damage and plasticity in UMAT, ABAQUS. My main question is that I am wondering why my results like yield stress , ultimate stress will be constant as I have changed the mesh size? For example for mesh size =0.2 and mesh size equal 0.00002. I would say I model damage and...
  2. mami826

    changing material properties in abaqus

    Hi, what is the meaning of that? """Just to mention that again: It is not possible to change the density during the simulation."" You mean density cannot define as a field variable in the USDFLD? what do you think about the following thread: http://www.eng-tips.com/viewthread.cfm?qid=385982...
  3. mami826

    changing material properties in abaqus

    Dear akabarten, many thanks foe your help. I wrote USDFLD for E and density based on your previous comments in the following thread: http://www.eng-tips.com/viewthread.cfm?qid=385982 but I gave different frequency compared with by-hand solution. I think it could related my BC. actually, BC is...
  4. mami826

    changing density with position

    Hi all http://www.eng-tips.com/viewthread.cfm?qid=407667 Hi All, I am going to model density that is changing through the thickness for graded plates. Before, I wrote UMAT to model variation of elastic modulus through the thickness and I solved my bending problem. But at this moments I want to...
  5. mami826

    Dear all friends, I want to specif

    Hi akabarten, As I search my issue in the net I found that you are expert and can help me to find the solution.I would greatly appreciate if you help me and get advice how can I modell density variation for vibration analysis in abaqus: I post the following one and i have not received any...
  6. mami826

    Hi All, I am going to model densit

    Hi All, I am going to model density that is changing through the thickness for graded plates. Before, I wrote UMAT to model variation of elastic modulus through the thickness and I solved my bending problem. But at this moments I want to add density to solve vibration as well. I dont know how...
  7. mami826

    changing material properties in abaqus

    Hi All, I am going to model density that is changing through the thickness for graded plates. Before, I wrote UMAT to model variation of elastic modulus through the thickness and I solved my bending problem. But at this moments I want to add density to solve vibration as well. I dont know how...
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