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What is stress in mechanics?

Hey guys,
Hope all is well with you all.This post is for class 11th students and engineering students of civil and mechanical streams.In 11th std physics book the definition of stress is simply given as the force applied per unit area on a body.Mathematically it is all good.But as far as real definition according to mechanics is concerned it is the reacting force generated per unit area in response to the external force applied.Had it been not so you cannot define the maximum stress limit of an object.Whenever stress limit is exceeded the object attains fatigue and tends towards fracture.Meaning stress of any object is bearable response to external load.Take an example of our daily life where we say the work load in office has created much stress in my life.Here stress refers to the mental stress caused due to work pressure.Here our brain is responsing to external pressure.Both the cases are similar.So understand this anology.So for a good engineering student stress is the force acting per unit area generated in response to external pressure.Hope I have been able to make you understand.
Thanks...

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