Static Brazilian disk test

pebli_hardipebli_hardi
edited September 2019
The static Brazilian experiments using the electro-mechanical universal testing machine (CRIMS DNS-100) on two types of glasses, test set-up is shown in Fig. 1.


Fig. 1 The static Brazilian disk test set-up.

The specimens were diametrically placed between two hard steel platens to avoid necessary indentation from glass particles.
The BD specimens (AG and CSG) were compressed at the constant loading-rate of 0.12 mm/min (2 × 10^-6 m/s).
- annealed glass (AG)
- chemically strengthened glass (CSG)



the cylindrical specimens of Ø 10 mm and height 8

how to modeling this set up





Comments

  • SergioSergio
    edited September 2019
    I did a quick model using lineal material for glass and fixtures, simmetry and applying 1mm of deformation to the upper fixture (that looks very excesive, look at the load deflection curve). Would be nice to know yield and ultimate stress for that glasses.

    I don´t know how to model the faliure of the glass, never had worked with such material.

    Could you please explain a little why you would do such analysis/test in glass?

  • VictorVictor
    edited September 2019
    You won't be able to simulate the failure itself in Mecway, which I guess is what those wave speeds are for?

    If the material has some load rate dependence, I think you can simply set the properties to what they would be for the load rate you're using. Then do nonlinear static analysis with quasi-static similar to the PipeClip.liml example described in Help -> Manual, or linear analysis with any displacement and just scale the solution to simulate any time in the compression process.
  • pebli_hardipebli_hardi
    I did a quick model using lineal material for glass and fixtures, simmetry and applying 1mm of deformation to the upper fixture (that looks very excesive, look at the load deflection curve). Would be nice to know yield and ultimate stress for that glasses.
    yes, I've seen the BRAZILIAN_STATIC_TEST.xls file
    to make a table like that, what should be chosen in the mecway table? because I'm not like that when copying from Mecway.

    what options are chosen?


    Could you please explain a little why you would do such analysis/test in glass?
    The intent of this research is to determine the tensile strength and fracture behavior of annealed and chemically strengthened aluminosilicate glass under static and dynamic loading conditions using Brazilian disc (BD) tests. Owing to high brittleness and very small failure strain of glass, this test method is preferred to indirectly measure the tensile strength by compressive loading of cylindrical specimens diametrically instead of using direct tensile test.

    based on experiments obtained curves like the picture below.





  • SergioSergio
    You must import the .dat file in a spreadsheet to get the results. They are triggered by the custom step contents with the ccx cards

    *NODE PRINT,NSET=NSET_MOVIL,TOTALS=ONLY
    RF
    *NODE PRINT,NSET=NSET_PILOT,TOTALS=ONLY
    U
  • pebli_hardipebli_hardi
    You must import the .dat file in a spreadsheet to get the results. They are triggered by the custom step contents with the ccx cards
    where is the .dat file? or how to make it
  • SergioSergio
    edited September 2019
    In Mecway go to Tools\Options\CalculiX\ and check "Same as the .liml file", then solve the problem and all the CCX files (including .dat) will be in the same folder as the .liml file.
  • pebli_hardipebli_hardi

    Oh, I see

  • pebli_hardipebli_hardi
    Sergio, how to save animation to gif image?
  • SergioSergio
    edited September 2019
    I did several screen captures with Greenshot at different (incresing) time, and then use Image Magick (by means of a .bat file) to convert it to an animated gif. Looks a little complex, but once you have the two tools configured is really easy.
  • VictorVictor
    If you're not worried about privacy, there are web services where you can convert MPEG generated by Mecway's animation button -> Save video to file to GIF. Just Google "mpeg to gif". But beware that some of these sites publish the content people put through them.
  • pebli_hardipebli_hardi
    oh like that, I think there is a certain way in Mecway, it turns out it requires a third party software
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