Abstract
Fatigue tests carried out at CETIM on a NE 42 CD 4 grade steel (BS Fn 19 A or AISI 4140) have shown that grinding parameters such as down feed and the type of wheel had a very clear influence on residual stresses and fatigue limit under plane bending. The stability in fatigue of the residual stresses obtained by 3 grinding, conditions were evaluated, using X-ray diffraction methods, in order to inject stabilized values into a computer programme developed for determine fatigue strength. This analysis contributes to a better knowledge of grinding effects in fatigue and allows the distinction between the respective influences of surface roughness and residual stresses.
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