Polyester creep prediction

Time-temperature shifting is used widely in the prediction of creep and creep-rupture in polyester geosynthetics. Creep of oriented polyesters is expressed by a linear or quadratic increase of strain with log (lifetime). The lifetime under constant load is expressed by the semilogarithmic formula ... 

Time to rupture can be predicted by using the accelerated times generated by the creep data, and the creep-rupture characteristic generated by performing twelve of these tests over a range of loads. Conventional long-term creep strain and creep-rupture tests have so far confirmed the validity of the predictions for polyester fibres. Comments on the method have been published by Greenwood and Voskamp [10]. 

Figure 9.1 Schematic prediction of creep modulus of polyester fibres from time-temperature shifted data (based on information from [5])...

Flexural creep testing on polymer concrete using an unsaturated polyester resin based on rPET was carried out to predict creep behaviour, and mechanical and empirical models were proposed using experiment results. The following conclusions were obtained from the results ... 

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