A Three Dimensional Graphical Aid for Fatigue Data Analysis
The fatigue behaviour of materials is usually synthesised in terms of stress-life (S-N) curve or in terms of strain-life (e-N) curve, the latter being described by the so-called Manson-Coffin equation. It is known that the assumption of equality of the plastic and elastic components between the Manson-Coffin and the stabilised stress-strain curves leads to the so-called compatibility conditions which connect the equations theoretically. The material constants of the Manson-Coffin and of the stabilised stress-strain curve are commonly determined by best fitting separately the experimental data obtained from strain-controlled fatigue tests. As a consequence the compatibility conditions may not be fulfilled. In this paper a method for fatigue data analysis that ensures the compatibility conditions is proposed and validated against experimental data.
Z. Tonković and M.H. Aliabadi
B. Atzori et al., "A Three Dimensional Graphical Aid for Fatigue Data Analysis", Key Engineering Materials, Vols. 488-489, pp. 755-758, 2012