Perforation impact response of bimaterial sheet composed of high density polyethylene and high density polyethylene with discontinuous Selar® microlayers

J. Karger-Kocsis, E. Moos, D. E. Mouzakis

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The out of plane type instrumented impact response of a polymer-polymer composite with asymmetric layup has been studied in uniaxial (Charpy and Izod tests) and biaxial (falling weight) conditions at -40°C. The flat on type bimaterial sheet (sandwich) was produced by hot pressing of plain high density polyethylene (HDPE) (H) and a HDPE blend with 14 wt-% Selar® RB 901 (S) in which the latter compound was dispersed by blow moulding in discontinuous microlayers. The structural inhomogeneity of this bimaterial with a more (H) and less tough (S) polymer layer was well reflected in the falling weight impact when loaded from the H and S side, respectively. The bimaterial sheet exhibited higher impact resistance when the tougher H layer was located on the tensile side. This was attributed to the reinforcing effect of the Selar microlayers, which made the S layer more stiff and less ductile, which affected the crack onset and crack growth through the alternating Selar and HDPE layers across the thickness. The reinforcing effect of the Selar was evidenced by infrared pictures taken of the plastic zone during loading of notched, edge on type model bimaterial specimens. Fractographic results indicated that the distribution and thickness of the Selar layers strongly influence the overall failure performance of the polymer-polymer composite.

Original languageEnglish
Pages (from-to)178-183
Number of pages6
JournalPlastics, Rubber and Composites Processing and Applications
Volume26
Issue number4
Publication statusPublished - 1997

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Polyethylene
High density polyethylenes
Polymers
Impact resistance
Composite materials
Hot pressing
Blow molding
Crack propagation
Plastics
Infrared radiation
Cracks

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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abstract = "The out of plane type instrumented impact response of a polymer-polymer composite with asymmetric layup has been studied in uniaxial (Charpy and Izod tests) and biaxial (falling weight) conditions at -40°C. The flat on type bimaterial sheet (sandwich) was produced by hot pressing of plain high density polyethylene (HDPE) (H) and a HDPE blend with 14 wt-{\%} Selar{\circledR} RB 901 (S) in which the latter compound was dispersed by blow moulding in discontinuous microlayers. The structural inhomogeneity of this bimaterial with a more (H) and less tough (S) polymer layer was well reflected in the falling weight impact when loaded from the H and S side, respectively. The bimaterial sheet exhibited higher impact resistance when the tougher H layer was located on the tensile side. This was attributed to the reinforcing effect of the Selar microlayers, which made the S layer more stiff and less ductile, which affected the crack onset and crack growth through the alternating Selar and HDPE layers across the thickness. The reinforcing effect of the Selar was evidenced by infrared pictures taken of the plastic zone during loading of notched, edge on type model bimaterial specimens. Fractographic results indicated that the distribution and thickness of the Selar layers strongly influence the overall failure performance of the polymer-polymer composite.",
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