Question

how to find stress strain

Answer 1

The stress applied to a material is the force per unit area applied to the material. The maximum stress a material can stand before it breaks is called the breaking stress or ultimate tensile stress.
Tensile means the material is under tension. The forces acting on it are trying to stretch the material. Compression is when the forces acting on an object are trying to squash it.

The equation below is used to calculate the stress.
stress=force/area
stress=F/A
stress = stress measured in Nm-2 or pascals (Pa)
F = force in newtons (N)
A = cross-sectional area in m2

Strain:-The ratio of extension to original length is called strain it has no units as it is a ratio of two lengths measured in metres.
strain=extension/length
strain=∆L/L
strain = strain it has no units
DL =extension measured in metres
L = original length measured in metres

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!