Establishing continuous relaxation spectrum based on complex modulus tests to construct relaxation modulus master curves in compliance with linear viscoelastic theory

The method developed in this study can be utilized to construct an accurate master curve of the relaxation modulus of any linear viscoelastic material. The constructed master curve of the relaxation modulus complies with the linear viscoelastic theory; specifically, it satisfies the approximate Kramers-Kronig relation and addresses the complete linear viscoelastic information delivered by both storage modulus and loss modulus.