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  1. mechdrive1

    Specifying wobbling (shaky motion) to a moving and rotating part

    @ FEA way: Thank you for your suggestion. I will go through the example and try to utilize it for my model.
  2. mechdrive1

    Specifying wobbling (shaky motion) to a moving and rotating part

    Hello everyone, I am trying to simulate the drilling of an aluminum layer by a screw bit. The tool (screw bit) used is of tool steel alloy and is defined as a rigid body. The aluminum layer is defined as the Eulerian workpiece (in order to eliminate element distortion issues). The tool is...
  3. mechdrive1

    Help regarding specifying field output variable of surface A as input onto surface B

    anyone?
  4. mechdrive1

    Help regarding specifying field output variable of surface A as input onto surface B

    Hello, I have been searching for a subroutine which would help in utilizing the field output variable quantity calculated by ABAQUS/Explicit, surface heat flux (HFL), of one surface elements to be specified as the input for another surface elements. There are two circular workpieces which have...
  5. mechdrive1

    Constraining/Tying Thermal DOF of two surfaces in ABAQUS/Explicit

    Mustaine3, I submitted a model without expansion coeff. and the result was similar. Element distortion occurred in the model and this one couldn't complete the first step itself. (other models were able to complete until the middle of 2nd step). Any suggestions?
  6. mechdrive1

    Constraining/Tying Thermal DOF of two surfaces in ABAQUS/Explicit

    Element distortion is my primary concern. I've read in some research paper, although no proper supporting evidence is there, that high magnitude of thermal conductance can cause hourglassing and element distortion issues. I reduced the magnitude of thermal conductance and noticed that the model...
  7. mechdrive1

    Constraining/Tying Thermal DOF of two surfaces in ABAQUS/Explicit

    Hello Mustaine3, I've submitted a model as per your suggestion and will update with the results once available but I don't get the relation between coeff. of expansion and element distortion? Can you please explain the same? Thanks, Ankit
  8. mechdrive1

    Constraining/Tying Thermal DOF of two surfaces in ABAQUS/Explicit

    Hello Everyone! I am facing element distortion issue due to thermal conductance (high magnitude) between aluminum-steel surfaces. The set-up of tool and workpiece is similar to friction stir-spot welding wherein tool is positioned on the top of two layers (aluminum & steel). The tool drills...
  9. mechdrive1

    adaptive mesh, loop parallelization warning

    Hello, I cannot say about loop parallelization problem, but like you mentioned there is large deformation and it's an thermo-mechanical problem it would be better to use hexahedral elements. Another suggestion would be to refer the user's guide for thermo-coupled topic and relevant examples in...
  10. mechdrive1

    ABAQUS/explicit Element Deletion- Dmax Specification

    Hello, I am trying to drill through a layer which is 1.5 mm thick with the help of a rigid tool which has translational and rotational motion. I have used Johnson-Cook plasticity and failure damage model for the layer. The material for the layer is al-6061. The layer is constrained so that it...
  11. mechdrive1

    Amplitude Definition DIfficulty

    I resolved the issue of gradual application of load. As has been mentioned in other similar posts, you just have to give the first and last data points and then abaqus automatically linearly interpolates between them. However, specifying a few additional data points seems to have worked too but...
  12. mechdrive1

    Amplitude Definition DIfficulty

    Mustaine3, Thank you for the suggestion. Can you please elaborate more on how I can increase the load with a linear curve? Do you mean I should be increasing linearly from some non-zero value to my final value of 5kN throughout the step? Regards, Ankit
  13. mechdrive1

    Amplitude Definition DIfficulty

    Hello, I am facing difficulty with respect to amplitude definition. My model consists of four steps with different step times in which load and angular velocity are applied and they vary in each step respectively. The load is applied in the form of pressure. My problem in the model is that the...
  14. mechdrive1

    ABAQUS BOUNDARY CONDITION GENERAL QUESTION

    Mustaine3, Thanks for the reference.
  15. mechdrive1

    Abaqus drilling

    Matmeanla, The way elements will be deleted and whether or not chips will be produced depends on the material property assigned which includes both J-C plastic and damage criteria. It would be good to verify the values you are using in the material property definition.
  16. mechdrive1

    ABAQUS BOUNDARY CONDITION GENERAL QUESTION

    Hello, I have a question regarding the specification of velocity (feed) using the 'velocity/angular velocity' boundary condition in ABAQUS: if I specify a velocity of 1 m/s without any amplitude and use 'instantaneous' instead, will ABAQUS apply the specified velocity of 1 m/s throughout the...
  17. mechdrive1

    Abaqus Damage evolution value

    Sidmane, The damage evolution value can be either fracture energy based (for which formula is provided in the documentation) or displacement (plastic strain) based for which you can refer to literature to find values suitable for your material and process.
  18. mechdrive1

    ABAQUS internal heat energy variable 'ALLIHE' definition and its calculation

    Anyone!?
  19. mechdrive1

    ABAQUS internal heat energy variable 'ALLIHE' definition and its calculation

    Hello, I was analysing the history output for different energies and observed that major contributor to 'ETOTAL' i.e. total energy which has a constant value of 4675 J was the internal heat energy 'ALLIHE'. The value of ALLIHE was highest among all energy variables and is also remaining...
  20. mechdrive1

    ABAQUS/Explicit Energy Balance

    Hello, I ran an Explicit (dynamic, coupled temp-disp) model for friction stir spot welding like process in which the tool penetrates the first layer of the workpiece (two layers, one above the other). The first layer of workpiece is Eulerian whereas the tool is Lagrangian which makes the model...

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