Tension in a Brittle Sample of Polystyrene

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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?

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https://brainmass.com/chemistry/materials-chemistry/tension-brittle-sample-polystyrene-30265

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Toughness is the property that enables a material to withstand shock and to be deformed ...

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