1. Chemistry
2. Physical Chemistry
3. Materials Chemistry
4. 30265

A brittle sample of polystyrene behaves elastically in tension, until it breaks in two when extended 2.2%, under a load of 55MPa. What is the toughness of this sample?

i know i may use the stress strain curve to solve this problem? (Force vs elongation)... but how do i solve the toughness of the sample?