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Effective use of metallic Z-pins for composites’ through-thickness reinforcement

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Effective use of metallic Z-pins for composites’ through-thickness reinforcement. / M'membe, Beene; Yasaee, Mehdi; Hallett, Stephen R.; Partridge, Ivana K.

In: Composites Science and Technology, Vol. 175, 03.05.2019, p. 77-84.

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M'membe, Beene ; Yasaee, Mehdi ; Hallett, Stephen R. ; Partridge, Ivana K. / Effective use of metallic Z-pins for composites’ through-thickness reinforcement. In: Composites Science and Technology. 2019 ; Vol. 175. pp. 77-84.

Bibtex

@article{450f83776e3642c99479f2a356f4ea5e,
title = "Effective use of metallic Z-pins for composites’ through-thickness reinforcement",
abstract = "Z-pins offer effective through-thickness reinforcement for laminated composites. Various studies have however, shown that metal Z-pins are less effective at bridging Mode I delaminations than carbon-fibre composite Z-pins, due to poor interfacial bonding with the laminate. This is exacerbated by high thermal mismatch between the metallic Z-pins and the laminate. This study investigates inserting metallic Z-pins at angles offset from the laminate normal, to improve the Mode I bridging in composites. The effects on the apparent fracture toughness under pure and mixed Mode I/II loads using single pin specimens is investigated. Results show that, unlike orthogonally inserted metal Z-pins, inclined Z-pins exhibit high energy absorption throughout the mixed mode range. Double Cantilever Beam (DCB) tests show that the inclined metal Z-pins increase the Mode I apparent fracture toughness by a factor of 2 compared to traditional carbon fibre Z-pins. In End Loaded Split (ELS) tests, the Mode II apparent fracture toughness of inclined stainless steel Z-pins, although less than their uninclined equivalent, is greater than that of carbon fibre Z-pins.",
keywords = "Fracture toughness, Inclined insertion, Metal Z-pins",
author = "Beene M'membe and Mehdi Yasaee and Hallett, {Stephen R.} and Partridge, {Ivana K.}",
year = "2019",
month = "5",
day = "3",
doi = "10.1016/j.compscitech.2019.02.024",
language = "English",
volume = "175",
pages = "77--84",
journal = "Composites Science and Technology",
issn = "0266-3538",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Effective use of metallic Z-pins for composites’ through-thickness reinforcement

AU - M'membe, Beene

AU - Yasaee, Mehdi

AU - Hallett, Stephen R.

AU - Partridge, Ivana K.

PY - 2019/5/3

Y1 - 2019/5/3

N2 - Z-pins offer effective through-thickness reinforcement for laminated composites. Various studies have however, shown that metal Z-pins are less effective at bridging Mode I delaminations than carbon-fibre composite Z-pins, due to poor interfacial bonding with the laminate. This is exacerbated by high thermal mismatch between the metallic Z-pins and the laminate. This study investigates inserting metallic Z-pins at angles offset from the laminate normal, to improve the Mode I bridging in composites. The effects on the apparent fracture toughness under pure and mixed Mode I/II loads using single pin specimens is investigated. Results show that, unlike orthogonally inserted metal Z-pins, inclined Z-pins exhibit high energy absorption throughout the mixed mode range. Double Cantilever Beam (DCB) tests show that the inclined metal Z-pins increase the Mode I apparent fracture toughness by a factor of 2 compared to traditional carbon fibre Z-pins. In End Loaded Split (ELS) tests, the Mode II apparent fracture toughness of inclined stainless steel Z-pins, although less than their uninclined equivalent, is greater than that of carbon fibre Z-pins.

AB - Z-pins offer effective through-thickness reinforcement for laminated composites. Various studies have however, shown that metal Z-pins are less effective at bridging Mode I delaminations than carbon-fibre composite Z-pins, due to poor interfacial bonding with the laminate. This is exacerbated by high thermal mismatch between the metallic Z-pins and the laminate. This study investigates inserting metallic Z-pins at angles offset from the laminate normal, to improve the Mode I bridging in composites. The effects on the apparent fracture toughness under pure and mixed Mode I/II loads using single pin specimens is investigated. Results show that, unlike orthogonally inserted metal Z-pins, inclined Z-pins exhibit high energy absorption throughout the mixed mode range. Double Cantilever Beam (DCB) tests show that the inclined metal Z-pins increase the Mode I apparent fracture toughness by a factor of 2 compared to traditional carbon fibre Z-pins. In End Loaded Split (ELS) tests, the Mode II apparent fracture toughness of inclined stainless steel Z-pins, although less than their uninclined equivalent, is greater than that of carbon fibre Z-pins.

KW - Fracture toughness

KW - Inclined insertion

KW - Metal Z-pins

UR - http://www.scopus.com/inward/record.url?scp=85062902647&partnerID=8YFLogxK

U2 - 10.1016/j.compscitech.2019.02.024

DO - 10.1016/j.compscitech.2019.02.024

M3 - Article

VL - 175

SP - 77

EP - 84

JO - Composites Science and Technology

JF - Composites Science and Technology

SN - 0266-3538

ER -