Question

Orthotropic planes have ____ mutually perpendicular planes of elastic symmetry.

(a) One

(b) Two

(c) Three

(d) Four

The question was asked in unit test.

This is a very interesting question from Two Dimensional Problems topic in chapter Two Dimensional Problems using Constant Strain Triangles of Finite Element Method

Answer 1

Correct option is (c) Three

For explanation: Orthotropic materials have material properties that differ along three mutually orthogonal two fold axis of rotational symmetry. Wood may also consider to be orthotropic. These materials have three mutually perpendicular planes.