Long-term creep of hybrid FRP bars

Five year long creep data for hybrid composites are reported. Glass-aramid-epoxy composites with different aramid and glass fiber ratios were investigated.

The theoretical prediction of creep is based on the knowledge of the creep properties of constituents. The long term creep of the matrix and fibers are predicted from the accelerated testing data using the time-temperature analogy. The theoretical and long term experimental results are compared and reveal a good coincidence.

It should be noted that, at some brittle-ductile fiber ratio and a certain load level, the fragmentation of brittle fibers can occur during the creep process. Such fragmentation leads to an unexpected creep acceleration. This phenomenon was observed and modeled using two year creep data for carbon-aramid composites.

• INTRODUCTION

• EXPERIMENTAL

• ANALYSIS AND DISCUSSION

• ACCELERATED PREDICTION OF CREEP

• THE INFLUENCE OF BRITTLE FIBER FRAGMENTATION ON THE CREEP PROCESS

• CONCLUSIONS

• REFERENCES