General Mechanical

General Mechanical

Predict the load-sdisplacement curve with ANSYS Workbench

    • Mn65


      I have a question regarding the following problem that I'm trying to study in ANSYS Workbench. I'm simulating an adhesively bonded joint of a double cantilever beam  (DCB), and I'm trying to predict the load-displacement curve of this specimen. I did the following steps:

      1- The experimental DCB tests were done and the load-displacement curves generated

      2- The fracture toughness (G) of the adhesive was calculated with the analytical formulations

      3- The same geometry was simulated in ANSYS Workbench (with the VCCT model) to create a FE model that could be able to predict the load-displacement curve of the experiment test (under the same loading conditions)

      4- Then the FE model was modified by changing the mesh size and the value of G to reach the closest load-displacement curve to the experimental curve.


      I have the following questions regarding this issue:


      1- The following warning appears, what does it mean, and how I can solve it;


      "The fracture parameters computed during solution may be incorrect. Check the Solver Output on the Solution Information object for possible causes"


      2- Do you have any idea to improve my model to have a closer load-displacement curve with the experiment? The following image shows a comparison between FE and the experiment curve.



      Thank you in advance for your consideration.

    • Ashish Khemka
      Ansys Employee

      Hi @Mn65,


      If the geometry and loading look fine to you then you should focus on the material properties which may be causing a difference in the results.



      Ashish Khemka

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