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
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

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