Chapter 8 Failure Flashcards
What is a simple fracture
The separation of a body into two or more pieces
Ductile fracture
- slow crack
- fails with warning
- significant plastic deformation
Brittle fracture
- Rapid crack
- little or no plastic deformation
- fails without warning
cup and cone fracture vs brittle fracture
examples of ductile and brittle fractures
5 stages of a moderately ductile failure
necking, void nucleation, void growth, crack propagation, fracture
principles of fracture mechanics
fracture mechanics formula
fracture mechanics, stress concentration formula
what is crack propagation
a stepwise discontinuous process, which agrees with propagation observed in the field
crack propagation and its criteria
what is fracture toughness
the measure of a material’s resistance to brittle fracture when a crack is present
fracture toughness formula
plane fracture toughness
What is the difference between fracture toughness and plane strain fracture toughness?
What is the difference between fracture toughness and plane strain fracture toughness?
They are different terms. Toughness is the ability of a material (assumed to be perfect, meaning no cracks) to absorb energy to fracture. It is measured by the area under the stress-strain curve to the point of fracture. Fracture Toughness is the ability of material with pre-cracks to resist fracture by absorbing energy