Mechanical Response of Thermoset Polymers under High Compressive Loads, 2

✍ Scribed by Lars-Olof Nordin; Erik Marklund; Daniel Ståhlberg; Janis Varna; Mats Johansson

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 171 KB
• Volume: 290
• Category: Article
• ISSN: 1438-7492
• DOI: 10.1002/mame.200500156

✦ Synopsis

Abstract

Summary: A nonlinear viscoelastic material model was used to describe the experimental behaviour of thin vinyl ester specimens subjected to compression in thickness direction. The stress‐dependent material functions in the model were found in creep and strain recovery tests on thick cylindrical specimens. The elastic and creep response of thin thermoset polymer specimens subjected to compressive loads was simulated while varying the geometry of the test set samples. The calculated increase in the apparent elastic modulus and decrease of the creep‐strain rate due to reduced thickness‐to‐width ratio is in a good qualitative correlation with experimental results for corresponding geometries. The constraint due to friction and interaction with the material outside the loaded surface area were identified as the cause for high apparent stiffness, which converges with decreasing thickness to an asymptotic value dependent on the modulus and Poisson's ratio of the material.

The shape of a 2 mm‐thick specimen under compression.

imageThe shape of a 2 mm‐thick specimen under compression.