Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5206908 | Polymer Testing | 2010 | 5 Pages |
Abstract
We adopted a non-contact laser technique to measure axial small strain (<â¼5%) of Kevlar® 129 fibers in a miniaturized tension Kolsky bar. Accurate small strain measurement is necessary to determine the elastic response of the fibers. In this optical arrangement, a laser beam passes through a line generator lens, which is known as a Powell glass, yielding a thin sheet of light with uniform intensity. This laser sheet passes through a gap formed by the fixture holding the fiber specimen. As the specimen is stretched, an increasing amount of light passes through the gap, which is measured by a high-speed, high resolution photo-detector mounted on the other side of the gap. Dynamic tensile experiments performed at a constant strain rate of â¼1500/s on Kevlar® 129 fibers demonstrate the capability of this non-contact laser technique in the determination of dynamic tensile strain histories with low amplitudes.
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Organic Chemistry
Authors
Jaeyoung Lim, Weinong W. Chen, James Q. Zheng,