Strain rate and gage length effects on tensile behavior of Kevlar 49 single yarn

D. Zhu, Barzin Mobasher, J. Erni, S. Bansal, Subramaniam Rajan

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


In the present paper, Kevlar® 49 single yarns with different gage lengths were tested under both quasi-static loading at a strain rate of 4.2 × 10 -4 s -1 using a MTS load frame and dynamic tensile loading over a strain rate range of 20-100 s -1 using a servo-hydraulic high-rate testing system. The experimental results showed that the material mechanical properties are dependent on gage length and strain rate. Young's modulus, tensile strength, maximum strain and toughness increase with increasing strain rate under dynamic loading; however the tensile strength decreases with increasing gage length under quasi-static loading. Weibull statistics were used to quantify the degree of variability in yarn strength at different gage lengths and strain rates. This data was then used to build an analytical model simulating the stress-strain response of single yarn under dynamic loading. The model predictions agree reasonably well with the experimental data.

Original languageEnglish (US)
Pages (from-to)2021-2029
Number of pages9
JournalComposites Part A: Applied Science and Manufacturing
Issue number11
StatePublished - Nov 2012


  • A. Yarn
  • B. Mechanical properties
  • C. Statistical properties/methods
  • D. Mechanical testing

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials


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