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Picking an element type for FEA

  1. Nov 14, 2016 #1
    When choosing between a 2D 4-node quadrilateral element and 8-node for FEA stress analysis, why is the 8 node option preferred? I understand it has much more flexibility with different shapes due to the central mid node but are there any other reasons?
     
  2. jcsd
  3. Nov 14, 2016 #2

    Mech_Engineer

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    This article gives a useful practical overview of mid-side node elements for stress calculation in ANSYS: http://www.padtinc.com/blog/the-focus/mid-side-nodes-do-they-really-help

    The advantages of elements with mid-side nodes are two fold:
    1. The sides of the element can better follow curved or non-uniform surface geometries
    2. Straight-sided (a.k.a. linear) elements only have two elements along any edge, so only linear interpolation is available between the nodes; if mesh density is limited, this can become a problem. FEA elements with mid-side nodes along each side allow for order (n-1) interpolation, so in the case of an element with single mid-side nodes (3 nodes per edge), 2nd-order quadratic interpolation is possible between nodes which in some cases results in smoother stress calculations.
     
  4. Nov 15, 2016 #3
    Thank you
     
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