Effects of fatigue damage on the impact energy-absorption property of talc-reinforced polypropylene copolymers

Hidetoshi Takeda, Mikiko Nakajima, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

Abstract

Fatigue tests were conducted using talc-reinforced Polypropylene copolymers. Then, high-speed tensile tests were conducted using the fatigue-damaged samples to reveal the effect of fatigue damage on the impact energy-absorption. The fatigue damage progression mechanism was investigated due to fracture surface observation, density measurement, and local elastic property. The following conclusions have been drawn from the experimental results: 1) The residual impact resistance decreases significantly with an increase in the lifetime ratio. 2) The fracture surfaces in a high-speed tensile test show prominent talc exposure, differing greatly from the surfaces of undamaged materials or creep-damaged materials. This state may have arisen due to the separation of talc portions from the matrix as a result of fatigue loading. 3) From the variation of density and local elastic modulus, we clarified that fatigue damage differs from creep-induced damage, which is caused by the large accumulation of voids, and is in fact caused by the talc separation described above. 4) The local elastic property measurement was shown to be an appropriate non-destructive method, capable of detecting reductions in the residual impact resistance of working products.

Original languageEnglish
Pages (from-to)267-272
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume51
Issue number3
DOIs
Publication statusPublished - 2002 Mar

Keywords

  • Density
  • Fatigue damage
  • Fracture surface
  • High-speed tensile test
  • Injection process
  • Lifetime ratio
  • Local elastic property
  • Notch
  • Residual impact resistance
  • Stress concentration
  • Talc-reinforced polypropylene copolymer
  • Void ratio

ASJC Scopus subject areas

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

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