A Three Dimensional Graphical Aid for Fatigue Data Analysis

Abstract:

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.

• Periodical: Key Engineering Materials (Volumes 488-489)
• Pages: 755-758
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.488-489.755
• Online since: September 2011
• Authors: Bruno Atzori, Giovanni Meneghetti, Mauro Ricotta
• Keywords: Compatibility Condition, Cyclic Stress-Strain Curve, Fatigue Data Analysis, Strain-Life Curve, Stress-Life Curve, Stress-Strain Curve

References

[1] ASTM E739 – 10: Standard practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (e{TTP}-3995 -N) fatigue data.

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