General Mechanical

General Mechanical

Topics relate to Mechanical Enterprise, Motion, Additive Print and more

Why do models with more elements / integration points through-thickness give stiffer responses?

    • jinglun

      Hi, I ran a mesh refinement study for a simple 3-point bending test. The stress-strain graphs of models with different element sizes are superimposed as below:

    • 1shan
      Ansys Employee
      Hello Array nIt would be more reasonable to say that inserting more elements across thickness would give a more accurate response rather than a more stiffer response. For example in some cases (like buckling) one may even observe that adding more elements causes the structure to soften because that is the actual expected behavior. Although there is another interesting concept of hourglass modes which are caused due to reduced integration. These are zero energy modes which lead to reduced stiffness. You might find a simple explanation to this on nRegards,nIshan.nn
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