Module 6: Failure and Damage
  Lecture 21: Macroscopic Failure Theories
 


Home Work:

  1. What are issues in failure theories for composites as compared to theories for homogeneous and isotropic materials?

  2. Explain in detail the following failure theories.

    1. Maximum stress theory

    2. Maximum strain theory

    3. Tsai-Hill theory

  3. What are the differences between maximum stress (or strain) and Tsai-Hill theory?

  4. The strains  are acting on  ply. Check weather this ply of AS4/3501-6 Epoxy material will fail or not using a) Maximum stress b) maximum strain and c) Tsai-Hill theory.

  5. For  ply the state of stress acting on it is . Find the value of  for which this ply of AS4/3501-6 Epoxy material will fail by a) Maximum stress b) maximum strain and c) Tsai-Hill theory.