Lecture 04/12

Question 1

What is simple fracture?

Answer 1

Seperation of a body into 2+ pieces in response to static stress

Question 2

What are the two fracture modes for metals?

Answer 2

Ductile and brittle

Question 3

What are the two steps of the fracture process?

Answer 3

Crack formation and propagation

Question 4

Ductile fracture is said to be?

Answer 4

Stable

Question 5

Brittle fracture is said to be?

Answer 5

Unstable

Question 6

What are fractographic studies?

Answer 6

Microscopic examination using electron microscopy

Question 7

In regards to stress concentration, the magnitude of applied tensile stress is amplified at?

Answer 7

Tips of the cracks

Question 8

What is fracture toughness?

Answer 8

Material’s resistance to brittle fracture when a crack is present

Question 9

Plane strain exists when?

Answer 9

Specimen thickness is much greater than the crack dimensions

Question 10

What are the tests used to measure the impact energy?

Answer 10

Charpy and Izod

Question 11

Crack growth in crystalline ceramics can be either?

Answer 11

Transgranular or intergranular

Question 12

Flexural strength _ with increased porosity

Answer 12

Decreases