Review for Test 3 – Chapters 7, 8 & 9

1. Be able to solve LEFM problems, i.e., examples from class and homework. Especially know the function of Y.

2. Know the differences between stress concentration and stress intensity factors.

Know the difference between stress intensity and critical stress intensity and between plane strain and plane stress.

3. Know the relationships between, G_c, K_c, J_c , dc (CTOD) and g_c.

4. Understand the concept of the J-integral; J = - 1/B d U/ d a .

5. Know concept of R-curve. What is the role of crack size?

6. Be able to calculate the probability of failure for a series of strength values or strength based on probability. Know the Weibull parameters and their meaning. Study Eqs. 7.39, 7.41a and 7.44, especially. (Know how to use them, as well.)

7. Know the differences between ductile and brittle failures.

8. Know how to identify tensile vs. shear vs. bending ductile failures.

9. Know the similarities and differences between metallic, ceramic and polymer failure surfaces.

10. Study the case studies presented in class.

11. Know what a fracture deformation map is. You do not have to reproduce it.

12. You are not responsible for Section 7.3 (except for the equation 7.5b), 7.6.1, 7.8 (except for definition of CTOD), 8.2.1, 8.3.2 [Eq.8.2 is incorrect], 8.3.4.

13. Be able to explain alternate methods of measuring toughness of a material.

14. Understand the concept of “leak-before-break” and how to calculate the stress before full failure.

15. Examine, i.e., study, figures in the chapters. Understand the meaning of graphs, especially Figs. 7.26, 7.27, 7.30, E7.8.4, 8.19,8.31, 8.41, 8.47, 8.49.