Question

Six node triangular elements is also known as _____

(a) Triangle

(b) Quadratic triangle

(c) Interpolation

(d) Shape function

This question was addressed to me in examination.

I want to ask this question from Four Node Quadrilateral for Axis Symmetric Problems topic in portion Two Dimensional Isoparametric Elements and Numerical Integration of Finite Element Method

Answer 1

Correct choice is (b) Quadratic triangle

For explanation I would say: The six-node triangle is shown in Figs. 7.8a and b. By referring to the master element where ϛ=1-ξ-η. Because of terms  ξ^2,η^2 etc. in the shape functions, this element is also called a quadratic triangle. The isoparametric representation is

u=Nq.