A novel methodology to model the creep behavior of polymers at different temperatures

• Published in: Polymer engineering and science Vol. 61; no. 12; pp. 3104 - 3117
• Main Authors: Kühl, Andre, Polak, Maria Anna
• Format: Journal Article
• Language: English
• Published: Hoboken, USA John Wiley & Sons, Inc 01-12-2021; Society of Plastics Engineers, Inc; Blackwell Publishing Ltd
• Subjects: Constitutive models; Creep; Creep tests; master curves; Materials; Mathematical models; Mechanical properties; Modelling; Nonlinear response; PMMA; Polymers; temperature; Tensile creep; tensile creep tests; Thermal properties; TTSSP; United States
• ISSN: 0032-3888; 1548-2634
• DOI: 10.1002/pen.25823

A new methodology for modeling the creep behavior of polymers at different temperatures, by using phenomenological constitutive models, is presented in this paper. The viscoelastic model is given by a combination of springs and dashpots and is used to describe the nonlinear response of polymers, and the viscoplastic formulation is given by a power‐law equation. The approach proposed in this work is based on building master curves for different stress levels, and finding the dependency of the constitutive parameters with the temperature. After fitting the equations to the tensile creep tests at different temperatures, the final constitutive formulation is capable of modeling the behavior of polymers at any stress level and temperatures. Poly methyl metacrytale (PMMA) was used to investigate the accuracy of this proposal, and the results showed good agreement with the experimental data.