Accession Number : ADA523337


Title :   Experimental Measurement and Computational Simulation of the Strains on a Single Yarn in a Kevlar Fabric During Stretching


Descriptive Note : Final rept.


Corporate Author : ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD


Personal Author(s) : Yu, Jian H ; McWilliams, Brandon ; Dehmer, Peter G ; Yen, Chian-Fong


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a523337.pdf


Report Date : Jun 2010


Pagination or Media Count : 18


Abstract : 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.


Descriptors :   *STRETCH FORMING , *YARNS , *MEASUREMENT , *SIMULATION , PHOTOGRAMMETRY , CHARGE COUPLED DEVICES , POLYAMIDE PLASTICS , COMPUTATIONS , OPTICAL PROPERTIES , STRESS STRAIN RELATIONS , FINITE ELEMENT ANALYSIS


Subject Categories : Textiles
      Fabrication Metallurgy
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE