General Mechanical

General Mechanical

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masonry prism test

    • VVR


      I'm trying to simulate the loading and cracking of a 5 masonry elements prism from this article: Vindhyashree, Miss & Tech, M & Student, Miss & Rahamath, Prema & Puttiah, Prema Kumar & Coordinator, P & M t, Prathap & Coordinator, Research. (2015). Numerical Simulation of Masonry Prism Test using ANSYS and ABAQUS. International Journal of Engineering Research and Technology. 

      I'm relatively new to ansys so I'm trying out to model a few simpler models like this, in order to be able to model a bigger masonry wall subjected to cyclic loading.

      I've used apdl commands for solid 65 and assigned corresponding material input data. Mesh type is hex8. Contacts are assigned as bonded.

      The prism should be loaded with 10 Mpa on top. However, when I apply the full load, error and warning messages appear and no solution is available (error message: Contact pair is inactive.). On the other hand, when I apply only 4 Mpa on top I get the solution. I suppose it's because with 4 Mpa loading, the prism is still in linear stress/strain domain (?).

      I've tried to apply the load in 10 substeps, but without sucess.

      Any ideas on how to solve this problem?

      Any idea or suggestion are welcome



      meshed prism

    • Ashish Kumar
      Forum Moderator



      Try doing a web search using the keywords: concrete crack ansys

      You will be able to find many YouTube videos on the same.


      Ashish Khemka

    • VVR

      I've already checked numerous forum threads and viewed youtube videos, but I'm still having issues with my model convergence. Even the message ''Contact pair is inactive'' is unclear to me since I've assigned the bonded contact type.
      I've even tried to model a simple concrete 100/100/100 mm cube under 20 Mpa pressure and obtain a crushing and cracking plot but without success. 
      Bearing in mind that my goal is to eventually model a masonry wall under cyclic (reverse) loading, I'm not sure whether solid65 is the right choice although majority of papers on masonry wall suggested using solid65 because of its cracking and crushing capabilities.

    • John Doyle
      Ansys Employee

      Microplane material model is our latest technology for simulating damage in the 18x element type..  See Section 4.10 of the Material Reference Manual and corresponding references for more details. 

      Also the note in solver output, regarding inactive contact element pair #21, might just a reference to autoasymmetric behavior.  It is not an error or warning, just a note.  If you force all the contact behaviors to be asymmetric, this note will probably disappear.

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