Question

For degenerate four noded quadrilateral element the errors are _____

(a) Constant

(b) Uniform

(c) Higher

(d) Lesser

The question was posed to me during an online exam.

This interesting question is from Numerical Integration topic in division Two Dimensional Isoparametric Elements and Numerical Integration of Finite Element Method

Answer 1

Correct option is (c) Higher

To explain: A degenerated element is an element whose characteristic face shape is quadrilateral, but is modeled with at least one triangular face. Degenerated elements are often used for modeling transition regions between fine and coarse meshes, or for modeling irregular and warped surfaces.