Abstract
Roller grips are frequently used in the determination of the load-elongation relationship of high-strength geotextiles. Due to some slippage of the specimen occurring at the grips, however, measurement of strains is not trivial. This paper presents a simple and inexpensive technique for measuring elongation strains. Strain gages are utilized and the reliability of their output is verified by photogrammetric measurements. Also addressed is the required minimum dimensions of the specimen, i.e. the width at which edge effects become negligible. This is particulary important with high-strength geotextiles, because physical constraints such as capacity of loading frame and grips tend to set a limit on the width of the specimen. It is shown that while a narrow strip may be adequate for one type of fabric structure, a full width of 20 cm is required for another. It appears that for both geotextiles tested an apparent elongation of 2–4% needs to develop in order to mobilize the full warp/fill yarn interaction.
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