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Stress Strain Plot

Observables

  • Elastic region
  • Yield point
  • Proof stress
  • Plastic portion
  • Steadily decreasing slope
  • Ultimate tensile strength
  • Localization of the deformation
  • Young’s modulus
  • Upper and lower yield stresses
  • Fractural strength

Stiff

Area under the curve, until the yield point. Higher area means the higher stiffness.

Strong/strength

  • For ductile materials: yield stress
  • For brittle materials: fracture stress

Flexible

Higher strain in elastic region.

Weak

Opposite to strengthness.

Greatest percentage elongation

Maximum strain or failure strain.