Define Stress - Strain of an Engineering Material?

Question

Accepted Answer

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

Stress is measured in units of force per unit area, such as pounds per square inch (psi) or newtons per square meter (N/m²).
Strain is measured as a ratio of the change in length or shape of the material to its original length or shape.
The relationship between stress and strain is described by the material's modulus of elasticity, which is a measure of its stiffness.
Different materials have different stress-strain curves, which describe how they respond to applied stress.
For example, brittle materials like glass have a steep stress-strain curve and tend to fracture under stress, while ductile materials like steel have a more gradual curve and can deform without breaking.

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