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

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.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2010
Accession Number
ADA523337

Entities

People

  • Brandon McWilliams
  • Chian-fong Yen
  • Jian Yu
  • Peter G. Dehmer

Organizations

  • United States Army Research Laboratory

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Boundaries
  • Cameras
  • Charge Coupled Devices
  • Digital Images
  • Displacement
  • Experimental Data
  • Finite Element Analysis
  • Geometry
  • Images
  • Materials
  • Measurement
  • Mechanical Properties
  • Modulus Of Elasticity
  • Photogrammetry
  • Simulations
  • Three Dimensional
  • Two Dimensional

Readers

  • Computational Fluid Dynamics (CFD)
  • Geodesy
  • Reinforced Composite Materials