The toughness data obtained from Charpy impact tests are presented by a temperature-energy relationship. Data fitting for quantitative comparing of transition temperature with upper shelf energy, ductile-brittle transition, in other words, the represe...
The toughness data obtained from Charpy impact tests are presented by a temperature-energy relationship. Data fitting for quantitative comparing of transition temperature with upper shelf energy, ductile-brittle transition, in other words, the representation with general mathematical model equation for energy variation according to the temperature is necessary. In this study, the Charpy impact tests to two kinds of the representative steel were carried out as a work for the material property standardization technique development. The fitting procedure of the scattering in data according to materials and temperature in the transition region was described. The data fitting procedure was established through the variances treatment in the transition region using the tangent hyperbolic function.