Characterization of loading, relaxation, and recovery behaviors of high‐density polyethylene using a three‐branch spring‐dashpot model

• DOI: 10.1002/pen.26891
• Publication Date: 2024-08-01T11:49:15Z
• Authors: Furui Shi; P.‐Y. Ben Jar
• Keywords: High-density polyethylene; Stress relaxation; Drop test

Abstract This paper presents an analysis of the stress evolution high‐density polyethylene (HDPE) at loading, relaxation, and recovery stages in a multi‐relaxation‐recovery (RR) test. The is based on three‐branch spring‐dashpot model that uses Eyring's law to govern viscous behavior. comprises two branches represent short‐ long‐term time‐dependent responses deformation, quasi‐static branch time‐independent response. A fast numerical framework genetic algorithms was developed determine values for parameters so difference between simulation experimental data could be less than 0.08 MPa. Using this approach, were determined as functions deformation time can simulate response RR also generated 10 sets parameter examine their consistency. study concludes serve suitable tool analyzing mechanical properties HDPE, potentially used characterize among PEs performance. Highlights Developed computer programs automatically. Explained unusual drop during after unloading. Evaluated statistical range good fitting.