{"id":359424,"date":"2024-03-28T11:32:34","date_gmt":"2024-03-28T11:32:34","guid":{"rendered":"\/forum\/forums\/topic\/geopolymer-modeling\/"},"modified":"2024-03-28T13:26:50","modified_gmt":"2024-03-28T13:26:50","slug":"geopolymer-modeling","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/geopolymer-modeling\/","title":{"rendered":"Geopolymer modeling Problem"},"content":{"rendered":"

Good morning, I am in desperate need of help! I am trying to model the compression of a geopolimer sample. The only values I obtained from the laboratory are:<\/p>\n

    \n
  1. Young’s Modulus<\/li>\n
  2. Poisson’s Ratio<\/li>\n
  3. Stress-strain curve (visible in the image)<\/li>\n<\/ol>\n

    Unfortunately, the geopolimer sample behaves more like cement than concrete, so I don’t know which material to use from the library. What I have done is visible in the picture.<\/p>\n

    I know what force was applied during the test, but when I apply it to my model (which also includes imperfections in the form of surface roughness to which I apply the load to model shearing correctly), the stress and strain are completely different from those in the test. Please help, what am I doing wrong? Should I choose a different material model? Or are the boundary conditions and simulation settings incorrect? I attach all the necessary photos.<\/p>\n

    Please also note that the material is very brittle, practically no plastic deformation occurs. (visible on the stress-strain curve)<\/p>\n

    Material model:
    <\/a><\/p>\n

    Stress – Strain curve from the lab: (green one)
    <\/a><\/p>\n

    Ansys static structural model: 
    I applied 1kN per second until reaching 18,5kN which was the force that broke the sample.
    <\/a><\/p>\n

    Boundry condition: fixed support.<\/p>\n

    <\/a><\/p>\n","protected":false},"template":"","class_list":["post-359424","topic","type-topic","status-closed","hentry","topic-tag-ansysworkbench-ansys-staticstructural","topic-tag-ansys-help","topic-tag-ansys-student","topic-tag-brittle-failure","topic-tag-brittle-materials","topic-tag-concrete","topic-tag-concrete-material","topic-tag-help","topic-tag-help-me-2","topic-tag-materials-problem","topic-tag-stress-strain"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t