Question

In two dimensional problems x-, y- co-ordinates are mapped onto ____

(a) x-, y- co-ordinates

(b) x-, ξ – co-ordinates

(c) η-, y- co-ordinates

(d) ξ-η-Co-ordinates

I got this question in a job interview.

This question is from Two Dimensional Problems in section Two Dimensional Problems using Constant Strain Triangles of Finite Element Method

Answer 1

Right option is (d) ξ-η-Co-ordinates

The explanation is: The similarity with one dimensional element should be noted ; in one dimensional problem the x- co-ordinates were mapped onto  ξ- co-ordinates  and the shape functions were defined as functions of ξ. In the two dimensional elements the x-, y-, co-ordinates are mapped onto ξ-,,η – co-ordinates.