Question

what is defination of stress and strain?​

Answer 1

Answer:

Medical Definition of Stress Stress: In a medical or biological context stress is a physical, mental, or emotional factor that causes bodily or mental tension. Stresses can be external (from the environment, psychological, or social situations) or internal (illness, or from a medical procedure).

: an act of straining or the condition of being strained: such as. a : bodily injury from excessive tension, effort, or use heart strain especially : one resulting from a wrench or twist and involving undue stretching of muscles or ligaments back strain.

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Answer 2

Hey there!

Suppose we are applying a deforming force on an object. Then there is change in its shape or size. and we define elesticity as the tendency of an object to gain its original configuration either shape or size when the deforming force is removed.

While deformation of the body, the deforming force it applied and therefore by Newton's third law we can say that an equal restoring force also acts to retain the body in its original shape. So we define two things for this. i.e Stress and Strain.

We define Stress as the  restoring forces per unit area of the body.

i.e Stress = Restoring force  / Area = F / A

And, We define Strain as the ratio of the change in configuration to the original configuration of the body is called strain,.

i.e Strain = Δconfiguration / orginal configuration

I hope it helps You!