Experimental Measurement and Computational Simulation of the Strains on a Single Yarn in a Kevlar Fabric During Stretching
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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The ability to measure the strain on an individual yarn is essential for the understanding of mechanical properties of fabrics. Using a non-contact technique called photogrammetry, we investigate the deformation of a single yarn in a Kevlar fabric as it undergoes stretching. Photogrammetry uses two charge-coupled device CCD cameras fitted with macro lenses to record stereo images of the fabric during stretching. We tracked the change in the arc length between a set of points and calculated the strain from the arc length at various locations. We used a finite element method FEM model to simulate the experiment, optimizing the material parameters in the FEM model by comparing the experimental data to the computational results. After optimization, the simulated displacement and strain time histories matched reasonably well with the experimental data.
- Fabrication Metallurgy