Experimental and theoretical investigations of residual strains formation under cyclic tension-compression of cross-ply fiber reinforced plastics

© 2020 Author(s). For fiber reinforced composite made of carbon fiber tape with [±45°]2s lay-up sequence, cyclic loading tests were carried out. It has been established that the stress-strain diagrams of such a composite under tension and compression are significantly different, and under symmetrical loading over time, the average value of the maximum and minimum strains is negative and decreases monotonously. It has been found that it is not enough to use the linear hereditarily elastic model to describe the behavior of the material under consideration. Even the use of a composite model with different elastic moduli and creep kernel under tension and compression does not allow us to describe the obtained experimental result. It is shown that the addition of an irreversible creep strain component to the viscoelastic strain component at the compression stage allows good agreement between the calculated and experimental results. It was revealed that when using the Abel creep kernel, the identification of its parameters can be carried out sequentially