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Opportunities in Protection Materials Science and Technology for Future Army Applications (2011) / Chapter Skim
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Appendix G: Failure Mechanisms of Ballistic Fabrics and Concepts for Improvement
Pages 139-141

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From page 139...
... Polymer fibers are normally ballistic impact, bond breakage and molecular slippage may highly crystalline and highly anisotropic due to the high occur simultaneously, or the primary bond breakage may molecular orientation and the covalent bonds along the even become predominant.2 Although the tensile properties fiber axis versus van der Waals or hydrogen bonding in the of fibers such as aramid and carbon fibers are relatively less transverse directions. However, glass and ceramic fibers can sensitive to the strain rate, fibers such as Spectra are sensitive be essentially isotropic due to their multidirectional ionic to strain rate, and their failure strain and mechanism at high covalent bonds.
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From page 140...
... This is more of an issue for thermolarge area of fabric target, it may significantly increase the plastic polymer fibers such as PE and nylons than for aroenergy absorbance. Remote yarn failure has been observed matic heterocyclic backbone fibers such as Kevlar due to the vastly higher melting points of the latter type of fiber.
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From page 141...
... layers of nylon fabrics to as high as 76.6°C after perforation Thus the development of even 1 GPa tensile strength magby a .22 caliber projectile. nesium fiber that could be used to replace bulk magnesium alloy in helmets with a magnesium alloy and Spectra fiber construction could be significant.
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Key Terms

  • yarn failure
  • remote yarn
  • tensile strength
  • failure mechanisms
  • bond breakage

  • yarn pullout
  • fiber axis
  • magnesium alloys
  • tensile modulus
  • ballistic fabrics

  • maximum strength
  • ballistic impact
  • carbon fibers
  • impact engineering
  • molecular slippage

  • yarns subjected
  • low strain
  • theoretical study
  • failure strain
  • fabric target

  • covalent bonds
  • mechanical properties
  • fabric mesh
  • yarn direction
  • shear modulus

  • damage forms
  • heat generation
  • lateral direction
  • fibers inside
  • polymer chains


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