Question

How many elastic constants will be in a non-homogeneous, non-isotropic material?

• A. 9
• B. 15
• C. 20
• D. 21

Hint:

- Isotropic materials: 2 constants - Orthotropic materials: 9 constants - Anisotropic materials: 21 constants

Answer 1

The Correct Option is D

Step 1: Understanding elastic constants. - For an isotropic material, there are 2 independent elastic constants. - For an orthotropic material, there are 9 independent elastic constants. - For a non-homogeneous, non-isotropic material, there are 21 independent constants. Step 2: Selecting the correct option. Since a non-homogeneous, non-isotropic material requires 21 elastic constants, the correct answer is (D).