Transformation of quasilinear equations of viscoelasticity satisfying the nonlinear principle of strain summation

1.	A method was developed for transforming quasilinear equations of viscoelasticity constructed on the basis of the strain summation principle.
2.	It was shown that a simplified variant of the equations containing two creep kernels can be used to describe experimental data.
3.	The structure of the relations that were obtained shows that, as in the linear theory of viscoelasticity, equations having resolvent creep operators are the simplest to transform.

Plastpolimer ONPO, Leningrad. Translated from Problemy Prochnosti, No. 8, pp. 82–87, August 1988.