Instrumented impact testing of a glass swirl mat-reinforced reaction injected-molded polyamide block copolymer (NBC)

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Abstract

The fracture behavior of a reaction injection-molded (RIM) polyamide block copolymer (NBC) reinforced with a continuous glass strand mat (swirl mat) was studied in instrumented high-speed impact-bending tests. Investigations were carried out on Charpy and Izod specimens of different size and notching direction to elucidate specimens' size effects. From the tests performed at ambient temperature and -40°C, fracture mechanical parameters (fracture toughness, fracture energy) and E-modulus were derived. Changes observed in the above parameters of the matrix were attributed to a molding-induced skin-core morphology. Both fracture toughness and energy of the composites depended strongly on the type, i.e., on the ligament width (W) and length-to-span ratio (L0/L) of the specimens. Reliable fracture mechanics data can be determined in three-point bending when W > 12 mm and L0/L > 1.7 for the specimens. The fracture toughness and E-modulus increased monotonously, whereas the fracture energy reached a plateau as a function of fiber mat content. Their values were only slightly influenced by the temperature. It was also shown how molding- and machining-induced flaw size can be defined. The failure mode of the materials was studied by fractography and the failure events were summarized in a model and discussed.

Original languageEnglish
Pages (from-to)1595-1609
Number of pages15
JournalJournal of Applied Polymer Science
Volume45
Issue number9
DOIs
Publication statusPublished - 1992

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Impact testing
Fracture energy
Nylons
Polyamides
Block copolymers
Fracture toughness
Molding
Glass
Fractography
Ligaments
Bending tests
Fracture mechanics
Failure modes
Skin
Machining
Temperature
Defects
Fibers
Composite materials

ASJC Scopus subject areas

  • Polymers and Plastics

Cite this

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title = "Instrumented impact testing of a glass swirl mat-reinforced reaction injected-molded polyamide block copolymer (NBC)",
abstract = "The fracture behavior of a reaction injection-molded (RIM) polyamide block copolymer (NBC) reinforced with a continuous glass strand mat (swirl mat) was studied in instrumented high-speed impact-bending tests. Investigations were carried out on Charpy and Izod specimens of different size and notching direction to elucidate specimens' size effects. From the tests performed at ambient temperature and -40°C, fracture mechanical parameters (fracture toughness, fracture energy) and E-modulus were derived. Changes observed in the above parameters of the matrix were attributed to a molding-induced skin-core morphology. Both fracture toughness and energy of the composites depended strongly on the type, i.e., on the ligament width (W) and length-to-span ratio (L0/L) of the specimens. Reliable fracture mechanics data can be determined in three-point bending when W > 12 mm and L0/L > 1.7 for the specimens. The fracture toughness and E-modulus increased monotonously, whereas the fracture energy reached a plateau as a function of fiber mat content. Their values were only slightly influenced by the temperature. It was also shown how molding- and machining-induced flaw size can be defined. The failure mode of the materials was studied by fractography and the failure events were summarized in a model and discussed.",
author = "J. Karger-Kocsis",
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AB - The fracture behavior of a reaction injection-molded (RIM) polyamide block copolymer (NBC) reinforced with a continuous glass strand mat (swirl mat) was studied in instrumented high-speed impact-bending tests. Investigations were carried out on Charpy and Izod specimens of different size and notching direction to elucidate specimens' size effects. From the tests performed at ambient temperature and -40°C, fracture mechanical parameters (fracture toughness, fracture energy) and E-modulus were derived. Changes observed in the above parameters of the matrix were attributed to a molding-induced skin-core morphology. Both fracture toughness and energy of the composites depended strongly on the type, i.e., on the ligament width (W) and length-to-span ratio (L0/L) of the specimens. Reliable fracture mechanics data can be determined in three-point bending when W > 12 mm and L0/L > 1.7 for the specimens. The fracture toughness and E-modulus increased monotonously, whereas the fracture energy reached a plateau as a function of fiber mat content. Their values were only slightly influenced by the temperature. It was also shown how molding- and machining-induced flaw size can be defined. The failure mode of the materials was studied by fractography and the failure events were summarized in a model and discussed.

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