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Recent content by Eser

  1. Eser

    UMAT non-isothermal isotropic hardening

    Hi All, I have a problem that I need to take in to account the elastic, thermal and plastic strains (with isotropic hardening). Temperature is changing and the corresponding material properties (elastic, plastic) are temperature dependent. This can be done in Abaqus without using subroutines...
  2. Eser

    Temperature decreases instead of rising !!

    Hi! I think you may check the energy dissipated from the contact, as an output variable. You can check first of all if there is really an energy dissapation during the process.
  3. Eser

    Thermal Expansion Coefficient dependent on time

    Hi All! Is anybody knows, how to define the thermal expansion coefficent dependent on temperature and time. Actually you can define a field variable dependency for the thermal expansion coefficient. Is it possible to use this option (field variable) to define a thermal expansion coefficent...
  4. Eser

    Thermal Stress Analysis

    Hi, You can use the following command under STEP: *Temperature, op=NEW, file=Name_of_the_ther_an_file.odb, bstep=1, binc=1, estep=2 You can have a look at in the documentation for the meaning of bstep, binc, estep from the keyword reference manual under Temperature. Regards, Atilim
  5. Eser

    Displaying Stress Values

    Hi All! I have a model with 3 different materials (3-different sections) and they have common boundries. The elastic modulus of the materials are quite different. (about 2 times larger or smaller) I want to find the absulut maximum principal stress on one of those section. If I use the...
  6. Eser

    Thermal Stress Analysis

    Hi All, I would like to run a thermal stress analysis using the temperature distribution of a heat transfer analysis. I have the results of the heat transfer analysis. Using the "post" option the temperature of each nodes and each integration point for each increment is written to the output...
  7. Eser

    Consistent Units for Thermo-Mech Analysis

    Hi all! I have a question regarding the selection of suitable units for the calculation of a thermal-mechanical analysis. Inorder to have the stress in Mpa what should be the unit of: -Specific Heat -Conductivity -Mass Density If the units of force is N and the distances are in mm. Thanks...
  8. Eser

    Suitable Units Thermo-Mech Analysis

    Hi all! I have a question regarding the selection of suitable units for the calculation of a thermal-mechanical analysis. Inorder to have the stress in Mpa what should be the unit of: -Specific Heat -Conductivity -Mass Density If the units of force is N and the distances are in mm. Thanks...
  9. Eser

    Modal Analysis

    Thanks PamCrash it is really clear now. I have only one more question. :) If we want the force function as for example F=5*sin(2*Pi*2.23Hz*t)+2*cos(2*Pi*13.97Hz*t)+3*sin(2*Pi*24.56Hz*t) then how can we define it in the input file?
  10. Eser

    Modal Analysis

    So what I understand is the force is defined as F=sin(w*f) where w is defined in the previous input file as 14,014 and the f is the frequency. But we have always the high deformations at the natural frequencies no matter how the force defined. Because it only gets the magnitude of the force from...
  11. Eser

    Modal Analysis

    I have already used *Steady State Dynamic Option, maybe it is better to represent the rest of my input file so that it becomes clear what I really want to do. *AMPLITUDE, NAME=sinus, DEFINITION=PERIODIC 1,14,014,0.,0. 0., 1. ************************************************************ *STEP...
  12. Eser

    Modal Analysis

    Thanks for your advice but How can I define the force as a sine function without defining *amplitude?
  13. Eser

    Modal Analysis

    Hi All! I have a simple cantilever beam model, that I calculated the natural frequencies and I want to do a mode based steady state dynamic analysis. I want to first apply a load which is a sine function of the frequency. I defined it like that: *AMPLITUDE, NAME=sinus, DEFINITION=PERIODIC...
  14. Eser

    Frequency Domain

    Hi All! I wanna solve a simple cantilever-beam problem using a mode-based steady state dynamic analyses in Abaqus. I have a force at the end of the beam F=sin(freq). I want to make a verification with the theoretical model. We know the maximum displacement as Ymax=F*l^3/(3EI) using the...
  15. Eser

    Total Mass

    Hi All! I am dealing with a modal analysis in Ansys to calculate the natural frequencies of the model and I would like to know if Ansys calculate the total mass of the model during the calculations and if it is the case how can we display the total mass. I used to use Abaqus and in Abaqus *.dat...
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