// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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sci.Charpy-impact-energy-temperature Calculator
Calculates the ductile-to-brittle transition temperature (DBTT) from Charpy impact energy vs temperature data using a sigmoid curve fit. Carbon steels transition from ductile to brittle behaviour below ≈ 0 °C — the Titanic's hull steel had a DBTT of +32 °C, making it brittle in the North Atlantic.
Inputs
E Upper J
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
E Lower J
Capacity to do work (J or kWh). Conserved — converts between forms but total stays constant in a closed system.
T50 C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
T Test C
Thermal state of the substance. Check whether the formula needs Celsius, Fahrenheit, or Kelvin (K = °C + 273.15).
Results
predicted CVN energy at test T (J)
The value at the specified point or condition.
% shear fracture estimate
The value at the specified point or condition.
upper shelf energy USE (J)
Sample size or count used in the calculation.
lower shelf energy LSE (J)
Sample size or count used in the calculation.
E = C + A·tanh[(T−T₅₀)/slope]
The gradient -- rise divided by run. In finance, rate of change per unit time.