Shear creep of epoxy adhesive joints: Experiment and fractional derivatives of rheological modeling

摘要

Epoxy adhesive joints have been widely used in the field of aeronautics, civil engineering, etc. Long term performance of epoxy adhesive joints is one of the key reasons for its successful engineering application. However, it has not been well studied. In this paper, experiments were carried out to investigate the shear creep behavior of epoxy adhesive joints under different stress levels. A fractional derivative rheological model is proposed to characterize the complicated creep deformation of epoxy adhesive joints with a simple expression. The results revealed that this model is capable of predicting the creep behavior of epoxy adhesive joints up to a sustained stress level of 30-70% of shear strength with a good accuracy.