Performance of chosen multiaxial cycle counting method under non-proportional multiaxial variable loading.

Matus Margetin,Dominik Biro,G Hénaff

doi:10.1051/matecconf/201816516008

Matus Margetin, Dominik Biro + Show 1 more

Open Access

https://doi.org/10.1051/matecconf/201816516008

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Abstract

One of the most crucial tasks in fatigue life-time estimation of components loaded with multiaxial variable amplitude loading is to correctly identify loading cycles that can be used with multiaxial damage criterions. During past years, several cycle counting methods have been proposed for multiaxial loading conditions. The aim of this text is the comparison of selected multiaxial cycle counting methods, namely Wang-Brown’s method, Modified Wang-Brown’s method, Bannantine-Socie’s method and then a critical analysis of the obtained results. For the comparison of chosen methods, a new data set, consisting of experimentally obtained results from multiaxial non-proportional variable amplitude loading tests carried on by authors, has been used. The tested specimens were made from S355J0 structural steel and the testing procedure has been carried out on the MTS Axial/Torsion servo hydraulic testing machine. Findley and McDiarmid multiaxial criterion with Palgren-Miner summation rule have been used for fatigue life-time estimation of the tested specimens.

Highlights

Fatigue life time estimation of mechanical components working under real multiaxial variable amplitude operational loadings could be considered as an most complex task in a field of fatigue life time analysis
While topics such as multiaxial damage criterions or damage accumulation rules are research subjects of many scientist and large amount of works in this fields have been published in recent years, there are not so many articles aiming on problem of loading cycle identification in variable multiaxial non-proportional loading signals
To verify methods mentioned in previous chapter, an experiment was conducted in which experimental specimens were loaded using various multiaxial loading signals

Summary

Introduction

Fatigue life time estimation of mechanical components working under real multiaxial variable amplitude operational loadings could be considered as an most complex task in a field of fatigue life time analysis This complexity of fatigue life time estimation is caused by the fact that the estimation process is composed from multiple independent but crucial tasks which influence final accuracy of fatigue life time estimation. While topics such as multiaxial damage criterions or damage accumulation rules are research subjects of many scientist and large amount of works in this fields have been published in recent years, there are not so many articles aiming on problem of loading cycle identification in variable multiaxial non-proportional loading signals.

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