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Related Experiment Video

Updated: Sep 3, 2025

Biomechanical Characterization of Human Soft Tissues Using Indentation and Tensile Testing

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Published on: December 13, 2016

Characterization of Polyethylene Using a New Test Method Based on Stress Response to Relaxation and Recovery.

Furui Shi¹, P-Y Ben Jar¹

¹Department of Mechanical Engineering, University of Alberta, 10-203 Donadeo Innovation Centre for Engineering, 9211-116 Street NW, Edmonton, AB T6G 1H9, Canada.

|July 27, 2022

Summary

A novel multi-relaxation-recovery test effectively characterizes polyethylene

Keywords:

activation energy deformation mechanism modeling multi-relaxation-recovery test polyethylene

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Area of Science:

Materials Science
Polymer Physics
Mechanical Engineering

Background:

Polyethylene (PE) exhibits complex viscoelastic behavior.
Understanding PE's mechanical performance is crucial for its applications.
Existing models may not fully capture stress relaxation and recovery dynamics.

Purpose of the Study:

Introduce a novel multi-relaxation-recovery (RR) test.
Evaluate nonlinear viscoelastic models for RR test data analysis.
Compare the mechanical performance of two PE types.

Main Methods:

Cyclic stress relaxation and recovery stages were employed.
Three nonlinear viscoelastic models (standard, parallel dashpots, series dashpots) were analyzed.
RR tests were conducted at room and elevated temperatures.

Main Results:

The standard model identifies long-term performance and plastic deformation onset in PE.
Models with parallel or series dashpots are necessary for accurate stress response simulation.
The RR test effectively separates time-dependent and time-independent stiffness components.

Conclusions:

The RR test provides valuable data for characterizing PE's time-dependent and time-independent mechanical responses.
This method aids in determining parameters for models like Eyring's.
The RR test offers insights into activation energies for deformation.