SYMPOSIA PAPER Published: 01 January 1997
STP11896S

Optical Measurement of Biaxial Strain in Thin Film Polymers

Source

A non-contacting optical method for the measurement of strain simultaneously in two directions has been developed in the process of characterizing the behavior of thin film polymers. The thin film specimen geometry is a cylinder created by heat sealing two layers of the material together. The technique utilizes a random speckle pattern that is painted on the surface of the specimen. Images are captured by a CCD camera of a small portion of the painted region as the material creeps under load. A digital image correlation technique is used to analyze the movement of the speckle pattern over time. The resulting displacement field obtained from these images is then used to determine the strain on the surface of the specimen. This strain measurement technique has also been extended to the measurement of biaxial strains on the surface of thick sheets as well as thin films.

Author Information

Rand, JL
Winzen Engineering, Inc., San Antonio, TX
Grant, DA
Winzen Engineering, Inc., San Antonio, TX
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 123–137
DOI: 10.1520/STP11896S
ISBN-EB: 978-0-8031-5371-4
ISBN-13: 978-0-8031-2403-5