Microstructural aspects of fracture and fatigue behavior in short fiber-reinforced, injection-molded PPS-, PEEK- and PEN-composites

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Abstract

Both the fracture and fatigue behavior of temperature-resistant thermoplastic matrix composites with discontinuous fiber reinforcement are strongly affected by the microstructure. The molding-induced microstructure of the composites can be characterized by a reinforcing effectiveness parameter (R). This parameter treats a short fiber reinforced injection-molded composite as a laminate, in the layers of which the fibers are present in different amounts, in various orientations and in addition, in various aspect ratios and aspect ratio distributions. The relative change in the fracture toughness can be predicted by the microstructural efficiency concept (M). Due to analogies between static fracture and fatigue crack propagation (FCP) results, this concept seems to work well when the dependence of FCP on microstructural details is considered.

Original languageEnglish
Pages (from-to)109-116
Number of pages8
JournalPolymer Bulletin
Volume27
Issue number1
DOIs
Publication statusPublished - Oct 1991

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PEEK
Polyether ether ketones
Fatigue of materials
crack propagation
injection
Fatigue crack propagation
composite materials
fibers
Fibers
aspect ratio
Aspect ratio
Composite materials
microstructure
Microstructure
Fiber reinforced materials
reinforcement
fracture strength
Molding
Thermoplastics
laminates

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

Cite this

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AB - Both the fracture and fatigue behavior of temperature-resistant thermoplastic matrix composites with discontinuous fiber reinforcement are strongly affected by the microstructure. The molding-induced microstructure of the composites can be characterized by a reinforcing effectiveness parameter (R). This parameter treats a short fiber reinforced injection-molded composite as a laminate, in the layers of which the fibers are present in different amounts, in various orientations and in addition, in various aspect ratios and aspect ratio distributions. The relative change in the fracture toughness can be predicted by the microstructural efficiency concept (M). Due to analogies between static fracture and fatigue crack propagation (FCP) results, this concept seems to work well when the dependence of FCP on microstructural details is considered.

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