Rule on these laminate claims

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   A symmetric laminate has a zero B matrix.

2. Statement is true

   No

   Statement

   A balanced layup has to be symmetric as well.

3. Statement is true

   Yes

   Statement

   A cross ply laminate uses only 0 and 90 degree plies.

4. Statement is true

   Yes

   Statement

   Plies far from the mid plane add most to bending stiffness.

5. Statement is true

   No

   Statement

   Stacking order changes the in plane stiffness of a symmetric stack.

6. Statement is true

   Yes

   Statement

   An unsymmetric laminate warps as it cools after cure.

7. Statement is true

   No

   Statement

   Kirchhoff plate theory allows through thickness shear.

Instructions

Tap true or false for each claim about how a stack of plies behaves.

Explanation