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High Accuracy - with very few elements
Typically, a notch is computed to within an accuracy of 2% error using an element division of only 4 elements per 90 angle of curvature. Doubling the element division, the accuracy is consistently better than 1% error.

Ease of use
Only the surface requires elements, so the volume remains free of element mesh. Accuracy is easily achieved because there is no (potentially low quality) volume mesh.

Quadratic shape functions (variables: nodal displacements and tractions). The elements are 6-node triangles, 8-node quadrilaterals and 9-node quadrilaterals.