Inducing out‐of‐plane auxetic behavior in needle‐punched nonwovens

  title={Inducing out‐of‐plane auxetic behavior in needle‐punched nonwovens},
  author={Prateek Verma and Meisha L. Shofner and Angela Lin and Karla B. Wagner and Anselm C. Griffin},
  journal={physica status solidi (b)},
We describe here a heat‐compression protocol used on needle‐punched commercial nonwoven fabrics which induces an out‐of‐plane auxetic response in these treated fabrics. The as‐received samples, however, are not auxetic and show a decrease in thickness when stretched uniaxially. Using micro‐CT imaging it was found that the vertical fiber bundles/columns, produced in the needle punching step of fabric manufacture, are tilted and buckled as a result of the heat‐compression treatment. It is… 

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