Effect of skin-core morphology on fatigue crack propagation in injection moulded polypropylene homopolymer

J. Karger-Kocsis, K. Friedrich

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Injection-moulding induced skin-core morphology related fatigue crack propagation of polypropylene homopolymer was studied for compact tension specimens in tension-tension mode. The microstructure, consisting of 6 zones which were grouped in skin, shear and core layers, was determined by light microscopy. The fatigue crack propagation response in the accelerated crack propagation range can adequately be described by the Paris equation. Onset of stable crack propagation acceleration occurred above a characteristics threshold stress intensity factor (ΔKt) which separates the accelerated from that of the delayed stable crack growth region. Measurements carried out on differently cracked compact tension specimens clearly indicated the self-reinforcing effect of the processing induced layer structure. Failure processes were studied by scanning electron microscopy. The shear region was the failure initiation site.

Original languageEnglish
Pages (from-to)161-168
Number of pages8
JournalInternational Journal of Fatigue
Volume11
Issue number3
DOIs
Publication statusPublished - 1989

Fingerprint

Fatigue Crack Propagation
Polypropylene
Polypropylenes
Homopolymerization
Fatigue crack propagation
Skin
Crack propagation
Injection
Crack Propagation
Injection molding
Stress intensity factors
Injection Molding
Optical microscopy
Crack Growth
Stress Intensity Factor
Scanning Electron Microscopy
Microscopy
Microstructure
Scanning electron microscopy
Processing

Keywords

  • fatigue crack propagation
  • fractography
  • injection-moulding
  • microstructure
  • polypropylene homopolymer
  • skin-core structure

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Effect of skin-core morphology on fatigue crack propagation in injection moulded polypropylene homopolymer. / Karger-Kocsis, J.; Friedrich, K.

In: International Journal of Fatigue, Vol. 11, No. 3, 1989, p. 161-168.

Research output: Contribution to journalArticle

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