First year materials engineering

[geffman1]

Homework Statement

hey guys, I've got an assignment and its asking me to explain why some materials to have the same toughness value, but quite different fracture toughness values? i really don't understand wats the difference between toughness and fracture toughness?

any help would be greatfully appreciated.

Homework Equations

The Attempt at a Solution

 

[Mapes]

Toughness is a measure of energy storage, while fracture toughness is a resistance to one specific type of failure. Low fracture toughness implies a susceptibility to failure by c____ p__________. (Blanks left for your enjoyment.)