Question

Eight-Node Quadrilateral. This element belongs to the ________ family of elements.

(a) Serendipity

(b) Constant matrix

(c) Load vector

(d) Master element

This question was addressed to me in an interview for internship.

The question is from Four Node Quadrilateral for Axis Symmetric Problems topic in section Two Dimensional Isoparametric Elements and Numerical Integration of Finite Element Method

Answer 1

The correct option is (a) Serendipity

For explanation I would say: The Eight-Node “Serendipity” Quadrilateral. This element is often abbreviated to Quad8 in the FEM literature. It is an eight-node quadrilateral element that results when the center node 9 of the biquadratic quadrilateral (Quad9) is eliminated by kinematic constraints.