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eng.material-stress Calculator
Calculates normal stress, shear stress, strain, and safety factor from applied force, area, and material yield strength. Yield strength divided by the calculated stress gives the factor of safety — structural codes typically require factors of 1.5–3.0 depending on load type.
Inputs
F
Push or pull (N). F = ma. Net force determines acceleration. Account for all forces including gravity and friction.
A
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
E
Material stiffness (GPa). Stress divided by strain in the elastic range. Steel: 200 GPa. Aluminium: 70 GPa. Rubber: 0.01–0.1 GPa.
Yield
Stress at which permanent deformation begins. Design loads should stay below this — apply a safety factor of 1.5–3×.
Results
stress
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
strain
Fractional deformation: change in length / original length. Elastic strain is fully recoverable; plastic strain is permanent. Plotted vs. stress on a stress-strain curve.
safety factor
A dimensionless multiplier applied in the calculation.
status
Current state of the system, process, or metric — typically pass/fail, healthy/warning/critical, or a descriptive classification.