SYMPOSIA PAPER Published: 01 January 2000

Comparative Study of Roller and Wedge Grips for Tensile Testing of High Strength Fabrics with Laser Extensometry: Comparisons to LVDT and Crosshead Extension


Measurement of the tensile properties of high strength woven and knit geotextiles and geogrids traditionally make use of roller grip-type clamping systems, which are designed to allow a sample to be pulled in tension without applying an excessive crimping or compressive force on the specimen, thus avoiding premature failure. Roller grips also have the advantage of allowing the specimen to align itself with the applied force and therefore loading the specimen uniformly across the width. However, since the specimen tightens itself around the grip during testing, crosshead travel cannot be used to measure specimen strain, making determination of low strain properties difficult. Two issues that must be addressed in obtaining low strain properties are how to measure sample strain and how to get an accurate and repeatable starting point for the test. This paper will explore alternate methods of gripping systems, strain measurement and data analysis with the objective of accurately measuring and reporting low strain properties of woven and knit geotextiles and geogrids.

Author Information

Skochdopole, TR
Atlantech International, Inc., Atlanta, GA
Cassady, L
Atlantech International, Inc., Atlanta, GA
Pihs, D
Atlantech International, Inc., Atlanta, GA
Stevenson, PE
Atlantech International, Inc., Atlanta, GA
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Developed by Committee: D35
Pages: 68–79
DOI: 10.1520/STP13472S
ISBN-EB: 978-0-8031-5428-5
ISBN-13: 978-0-8031-2854-5