Infusible thermoplastic resin based sandwich structures for wind blade applications and the influence of scrim on facesheet to core interface debonding

Arwood, Zachariah; Young, Stephen; Penumadu, Dayakar

doi:10.1177/10996362221125876

Infusible thermoplastic resin based sandwich structures for wind blade applications and the influence of scrim on facesheet to core interface debonding

Journal Article · Tue Sep 06 00:00:00 EDT 2022 · Journal of Sandwich Structures & Materials

DOI:https://doi.org/10.1177/10996362221125876· OSTI ID:1885608

^[1]; Young, Stephen ^[1]; Penumadu, Dayakar ^[1]

Tickle College of Engineering, University of Tennessee, Knoxville, TN, USA

Infusible thermoplastic Elium® family of resins from Arkema have garnered much attention in recent years as a possible replacement for thermoset resins in laminate and sandwich composite manufacturing for wind blade applications due to its ease of recyclability and the ability to utilize existing manufacturing processes without imposing complicated variations. However, physical and mechanical properties of the proposed Elium® based thermoplastic composites must be comparable to existing epoxy (thermoset) based composites using manufacturing processes relevant for large wind turbine blades. A 13-meter-long demonstration blade was manufactured for that purpose and sandwich samples were obtained from that project for a detailed study. This paper details three-point flexural properties of unidirectional E-glass fiber reinforced acrylic and epoxy based sandwich panels with identical balsa wood core materials. In addition, to evaluate the relative merit considering debond failure mode, the interfacial critical strain energy release rate, predominantly in mode-1, was compared via single cantilever beam testing. In sandwich composites constructed with balsa wood core material, resin uptake by the balsa core is traditionally impeded via the insertion of a scrim material at the facesheet to core interface. Results revealed that inclusion of scrim mesh layer at the facesheet to core interface reduced flexural properties and strain energy release rates in panels infused with acrylic resin but did not significantly reduce these properties in epoxy infused facesheets.

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Sponsoring Organization:: USDOE

OSTI ID:: 1885608

Alternate ID(s):: OSTI ID: 2417734

Journal Information:: Journal of Sandwich Structures & Materials, Journal Name: Journal of Sandwich Structures & Materials Journal Issue: 1 Vol. 25; ISSN 1099-6362

Publisher:: SAGE PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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