La Resistance A La Fatigue Des Toles Oxycoupees

Author:  Piraprez, E.
Source:  Conf Proc: ICSP-1, (p.405-412)
Doc ID:  1981044
Year of Publication:  1981
Abstract:  
The nonhomogeneous heat distribution during gas cutting of AE355 steel involves the creation of residual stresses that influence the fatigue strength or the stress value under which instability phenomena appear. A research has been undertaken to study the behavior of thermal-cut elements and, if possible, to establish a method to improve their mechanical characteristics. The scratches of grinding constitute rupture beginnings nearly as harmful as the drag lines of cutting, but shot peening of the gas-cut face improves the fatigue strength to a value between 30 and 35 N/mm exp 2, which is a higher value than that obtained by preheating the plate before cutting. Descriptors: Structural steels-- Mechanical properties; Plate metal-- Machining; Oxygen cutting; Fatigue strength; Residual stress; Shot peening