Machine Design
The property of a material which enables it to resist fracture due to high impact loads is known as

Strength
Endurance
Elasticity
Toughness

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Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

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