The strain energy stored in a spring when subjected to greatest l

SOLUTION

Proof resilience is defined as the maximum energy that can be absorbed up to the elastic limit, without creating a permanent distortion.

Proof Stress: When a yield point is not easily defined based on the shape of the stress–strain curve an offset yield point is arbitrarily defined. The value for this is commonly set at 0.1 or 0.2% plastic strain. The line is drawn parallel to stress strain curve from this arbitrary marked strain value where it meets the stress strain curve, the ordinate of the meeting point gives the value of Proof stress.