Characterization of fatigue behavior of long fiber reinforced thermoplastic (LFT) composites

A. Goel, K. K. Chawla, U. K. Vaidya, Nikhilesh Chawla, M. Koopman

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Fatigue behavior of long fiber reinforced thermoplastic composites (polypropylene/20 vol.% E-glass fiber) is presented in terms of stress - number of cycles to failure curves. Samples tested along longitudinal direction showed a higher fatigue life than the transverse samples which can be explained by the preferential orientation of the fibers along the longitudinal direction developed during the processing. Fatigue life decreased with increase in frequency. Hysteretic loss and temperature rise were measured; they depended on the stress amplitude as well as the cyclic frequency. Long fiber reinforced thermoplastic composite showed a lower temperature rise compared to unreinforced PP because long fiber reinforced thermoplastic has higher thermal conductivity than unreinforced PP and thus faster heat dissipation to the surroundings occur. The hysteretic heating also led to decrease in the modulus of long fiber reinforced thermoplastic as a function of number of cycles due to the softening of the matrix during fatigue cycling and depended on stress amplitude and frequency of the test.

Original languageEnglish (US)
Pages (from-to)537-544
Number of pages8
JournalMaterials Characterization
Issue number6
StatePublished - Jun 2009


  • Fatigue
  • Hysteretic heating
  • Long fiber reinforced thermoplastic (LFT)
  • Modulus change
  • S-N curves

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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