A nonlinear viscoelastic–viscoplastic model for adhesives

• Published in: Mechanics of time-dependent materials Vol. 25; no. 4; pp. 565 - 579
• Main Authors: Chen, Yi, Smith, Lloyd V.
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.12.2021; Springer Nature B.V
• Subjects: Adhesives; Characterization and Evaluation of Materials; Classical Mechanics; Cyclic loads; Data recovery; Engineering; Finite element method; Iterative methods; Mathematical models; Polymer Sciences; Solid Mechanics; Viscoelasticity; Yield criteria; Viscoelasticity; Ratcheting; Iterative; Creep; Viscoplasticity; Finite element
• ISSN: 1385-2000; 1573-2738
• DOI: 10.1007/s11043-020-09460-2

We consider the nonlinear viscoelastic–viscoplastic behavior of adhesives. We develop a one-dimensional nonlinear model by combining Schapery’s nonlinear single integral model and Perzyna’s viscoplastic model. The viscoplastic strain was solved iteratively using the von Mises yield criterion and nonlinear kinematic hardening. The combined viscoelastic–viscoplastic model was solved using Newton’s iteration and implemented into a finite element model. The model was calibrated using creep-recovery data from bulk adhesives and verified from the cyclic behavior of the bulk adhesives. The finite element model results agreed with experimental creep and cyclic responses, including recoverable and permanent strain after load removal. Although the contribution of the viscoplastic strain was small, both viscoplastic and viscoelastic components of strain response were required to describe the adhesive creep and cyclic response.