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sci.shape-memory-alloy-recovery Calculator
Calculates shape memory alloy recovery stress and strain from transformation temperatures (Ms, Mf, As, Af) and material constants. Nitinol (Ni-Ti) SMA recovers up to 8% strain — used in cardiovascular stents that are compressed for delivery and self-expand to vessel diameter when warmed by body heat.
Inputs
Austenite Finish Temp C
Reference formula or conversion factor shown for context.
Martensite Start Temp C
Reference formula or conversion factor shown for context.
Strain Pct
Dimensionless fractional deformation. Elastic strain is recoverable; plastic strain is permanent.
Current Temp C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
martensite fraction
The hard microstructure formed in steel by rapid quenching. Higher carbon content raises hardness but reduces toughness.
strain recovery on heating
Fractional deformation: change in length / original length. Elastic strain is fully recoverable; plastic strain is permanent. Plotted vs. stress on a stress-strain curve.
recoverable 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.