Practical Application of the Time-Temperature Shift According to Arrhenius

1 Practical Application of the Time-Temperature Shift According to Arrhenius 

The time-temperature shift principle using the Arrhenius approach (Eq. 1.36) means that a service time t at temperature T can be converted to a correspondingly shorter reference time fref at increased reference temperature T f, so that varying temperature profiles can be treated at constant load. This approach represents an engineering evaluation on a logarithmic time scale. Here it should be noted that absolute temperatures are to be used [104]. 

In practice, applying this time-temperature shift following the Arrhenius approach means that changes in characteristic material and component properties are measured at various temperatures over time. The recorded diagrams are called service 

The display of these service life curves offers two different approaches  

With the first approach, the initial values at different temperatures will also be different, representing the initial value for the unaged sample. These initial values differ because the material properties change at elevated temperatures. Strictly speaking, these differences indicate the influence of physical aging processes [104]. 

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