What's stress and strain?

Question

Accepted Answer

Stress is the force applied to a material, while strain is the resulting deformation or change in shape.

Stress is the internal resistance of a material to deformation under an applied force.
Strain is the measure of deformation or change in shape of a material in response to stress.
Stress is typically measured in units of force per unit area (such as Pascals), while strain is dimensionless.
The relationship between stress and strain is described by the material's modulus of elasticity.
Example: When a metal rod is pulled by a force, the stress on the rod increases as the force increases, leading to strain in the rod.

Accepted Answer

Stress: Stress is a measure of the internal forces within a material. It's defined as the force applied per unit area of the material. Mathematically, stress (σ) is expressed as:
𝜎
=
𝐹
𝐴
σ= 
A
F
​
 Where:
𝜎
σ is stress,
𝐹
F is the applied force, and
𝐴
A is the cross-sectional area over which the force is applied.
Stress can be tensile (stretching), compressive (squeezing), or shear (sliding).
Strain: Strain is a measure of the deformation of a material in response to stress. It represents the relative change in shape or size of the material. Mathematically, strain (ε) is expressed as:
𝜖
=
Δ
𝐿
𝐿
0
ϵ= 
L 
0
​
 
ΔL
​
 Where:
𝜖
ϵ is strain,
Δ
𝐿
ΔL is the change in length of the material, and
𝐿
0
L 
0
​
  is the original length of the material.
Strain can be elastic (reversible deformation) or plastic (permanent deformation).

What's stress and strain?

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