There are two alternative formulation of non-linear viscoelastic model to describe strain and stress controlled tests. Both models for non-linear viscoelastic materials are not compatible, and cannot be directly inverted if so required in certain cases. In order to do it numerical procedures has to be employed. Methodology for simulating nonlinear stress-strain response in iso-strain situations of fiber composites based on properties on constituents is presented.
Funding text 1: Part of this study was financially supported by EXCEL project, “Increased competitiveness and visibility of Composite Centre Sweden through excellence in bio-nano multi-scale composites and high-temperature composites” funded by local government Norrbotten, SWEDEN. Swerea SICOMP is acknowledged for supplying of materials and help with manufacturing.