Crack growth rate as a function of stress intensity factor range characterizes a material s resistance to crack extension under cyclic loading. Crack growth may eventually cause fracture which justifies the importance of this study in order to conceive well dimensioned structures. When this type of default is detected, it is necessary to be able to quantify it s damage and risk. Therefore, the purpose of this research was to get in contact with the theory behind fatigue crack growth and corroborate it by completion of practical tests in the laboratory. In this project, crack growth rates were measured on low carbon steel, more specifically AISI 1020 carbon steel, thanks to its excellent properties, low price and importance in the world economy nowadays. It is proven that cracks have more chances of initiating in regions where stress concentration is present. This may be due to inclusions or holes in the microstructure of the material, sharpened ends, notches or variations in the geometry of a structure. Sometimes, when a material is very resistant, high stress concentrations can actually be benefic to the structure and cause crack growth to stop. In order to take all these factors into account in the study of crack growth on low carbon steels, DC(T) specimens were machined with a Straight Thru notch, guaranteeing crack initiation when submitted to cyclic constant amplitude loading.