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eng.thermal-stress-bimetallic Calculator
Calculates thermal stress in a bimetallic strip from material CTEs, temperature change, and constraint conditions. Bimetallic strips deflect because the materials have different CTEs — this is the principle behind mechanical thermostats and thermal circuit breakers.
Inputs
Temp Change C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Cte1 Per C
Reference formula or conversion factor shown for context.
Cte2 Per C
Reference formula or conversion factor shown for context.
Youngs Modulus 1 Gpa
Reference formula or conversion factor shown for context.
Thickness Ratio
Perpendicular measurement through the material. For insulation: thicker is better. For beams: directly affects bending resistance.
Results
thermal mismatch stress (MPa)
Internal force per unit area (Pa or MPa). Must stay below yield strength in service. Beyond yield: permanent deformation. Beyond tensile strength: fracture.
curvature (1/m)
The value at the specified point or condition.
CTE mismatch
The value at the specified point or condition.
radius of curvature (m)
The computed radius -- half the diameter.
Stoney equation
The value at the specified point or condition.
solder joint risk
Overall risk level based on the computed score or classification. Higher risk may call for mitigating actions or additional review.