Related Experiment Video
Updated: Oct 12, 2025

Studying Large Amplitude Oscillatory Shear Response of Soft Materials
Published on: April 25, 2019
Viscoelastic Property of an LDPE Melt in Triangular- and Trapezoidal-Loop Shear Experiment
Shuxin Huang1,2
1Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, China.
Abstract:
The time-dependent viscoelastic behaviors of a low-density polyethylene melt (LDPE) in a triangular- and trapezoidal-loop shear experiment reported previously are described here by an integral-type Rivlin-Sawyers (RS) constitutive equation. The linear viscoelasticity of the melt was obtained through a dynamic frequency sweep experiment at a small strain and fitted by a relaxation spectrum. The nonlinear viscoelasticity was characterized by viscosity. All the experimental viscoelastic behaviors of the melt can be divided into two types in terms of the predictions of the RS model: (1) predictable time-dependent viscoelastic behaviors at low shear rates or during short-term shear, and (2) unpredictable shear weakening behavior occurring at the high shear rate of 3-5 s-1 during long-term shear with the characteristic time interval of about 40-100 s. The influence of experimental error caused possibly by inhomogeneous samples on the viscoelasticity of the melt was analyzed, and the large relative error in the experiment is about 10-30%.
More Related Videos
11:17Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
Published on: January 19, 2016
08:42Challenges in Rheological Characterization of Highly Concentrated Suspensions — A Case Study for Screen-printing Silver Pastes
Published on: April 10, 2017
Related Concept Videos
Plastic Behavior
Elastic Strain Energy for Shearing Stresses
Shearing Strain
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
Plastic Deformation in Circular Shafts
Problem Solving on Stress and Strain