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Regarding only quad/Hex in J- integral calculation in Abaqus Vs triangular elements

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  • Regarding only quad/Hex in J- integral calculation in Abaqus Vs triangular elements

    I have few basic questions about elements selection/usage in FEM for fracture mechanics problems,

    1, In abaqus why near the contour regions ONLY quadrilateral or Hexahedron elements should be used ? any specific importance.

    2, But with other LEFM programs triangular/tetrahedron elements are used, with 2nd order elements(elements with mid-nodes) and quarter point method, why any specific importance, some comments about quad/hexa Vs tria/tetra elements and 1st order Vs 2nd order and quarter point method?

    3, In abaqus why the mid-nodes are selected in the contour regions, if 2nd order elements are used ?
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