Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Hao Cui; Mehdi Yasaee; Gordon Kalwak; Antonio Pellegrino; Ivana K Partridge; Stephen R Hallett; Giuliano Allegri; Nik Petrinic

doi:10.1016/j.compositesa.2017.04.009

Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

Hao Cui, Mehdi Yasaee, Gordon Kalwak, Antonio Pellegrino, Ivana K Partridge, Stephen R Hallett, Giuliano Allegri, Nik Petrinic

Research output: Contribution to journal › Article (Academic Journal) › peer-review

34 Citations (Scopus)

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Abstract

Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasi-isotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.

Original language	English
Pages (from-to)	198-207
Number of pages	10
Journal	Composites Part A: Applied Science and Manufacturing
Volume	99
Early online date	13 Apr 2017
DOIs	https://doi.org/10.1016/j.compositesa.2017.04.009
Publication status	Published - Aug 2017

Keywords

Z-pin
mode I
mode II
delamination
dynamic

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10.1016/j.compositesa.2017.04.009

Full-text PDF (accepted author manuscript)
This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at http://www.sciencedirect.com/science/article/pii/S1359835X17301586. Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 1.45 MBLicence: CC BY-NC-ND

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Understanding Delamination Suppression at High Deformation Rates in Through-Thickness Reinforced Laminated Composites
Hallett, S. R. (Principal Investigator)
31/03/15 → 30/09/18
Project: Research

Z-pin high rate mode I and II experiments
Allegri, G. (Creator), Partridge, I. (Creator), Hallett, S. R. (Creator), Hallett, S. (Creator), Yasaee, M. (Creator), Cui, H. (Creator) & Pellegrino, A. (Creator), University of Bristol, 20 Apr 2017
DOI: 10.5523/bris.s7q6fmuv4vbs2mmoi96xwrwse, http://data.bris.ac.uk/data/dataset/s7q6fmuv4vbs2mmoi96xwrwse
Dataset

Professor Stephen R Hallett
- Stephen.Hallettbristol.acuk
- School of Civil, Aerospace and Design Engineering - Professor in Composite Structures
- Cabot Institute for the Environment
- Composites University Technology Centre (UTC)
- Bristol Composites Institute
Person: Academic , Member, Group lead

Cite this

@article{e9183efd9eca478a875f507cf697751a,

title = "Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination",

abstract = "Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasi-isotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.",

keywords = "Z-pin, mode I, mode II, delamination, dynamic",

author = "Hao Cui and Mehdi Yasaee and Gordon Kalwak and Antonio Pellegrino and Partridge, {Ivana K} and Hallett, {Stephen R} and Giuliano Allegri and Nik Petrinic",

year = "2017",

month = aug,

doi = "10.1016/j.compositesa.2017.04.009",

language = "English",

volume = "99",

pages = "198--207",

journal = "Composites Part A: Applied Science and Manufacturing",

issn = "1359-835X",

publisher = "Elsevier Science",

}

TY - JOUR

T1 - Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

AU - Cui, Hao

AU - Yasaee, Mehdi

AU - Kalwak, Gordon

AU - Pellegrino, Antonio

AU - Partridge, Ivana K

AU - Hallett, Stephen R

AU - Allegri, Giuliano

AU - Petrinic, Nik

PY - 2017/8

Y1 - 2017/8

N2 - Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasi-isotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.

AB - Z-pin through-thickness reinforcement is used to improve the impact resistance of composite structures; however, the effect of loading rate on Z-pin behaviour is not well understood. The dynamic response of Z-pins in mode I and II delamination of quasi-isotropic IM7/8552 laminates was characterized experimentally in this work. Z-pinned samples were loaded at both quasi-static and dynamic rates, up to a separation velocity of 12m/s. The efficiency of Z-pins in mode I delamination decreased with loading rate, which was mainly due to the change in the pin misalignment, the failure surface morphology and to inertia. The Z-pins failed at small displacements in the mode II loading experiments, resulting in much lower energy dissipation in comparison with the mode I case. The total energy dissipation decreased with increasing loading rate, while enhanced interfacial friction due to failed pins may be largely responsible for the higher energy dissipation in quasi-static experiments.

KW - Z-pin

KW - mode I

KW - mode II

KW - delamination

KW - dynamic

U2 - 10.1016/j.compositesa.2017.04.009

DO - 10.1016/j.compositesa.2017.04.009

M3 - Article (Academic Journal)

SN - 1359-835X

VL - 99

SP - 198

EP - 207

JO - Composites Part A: Applied Science and Manufacturing

JF - Composites Part A: Applied Science and Manufacturing

ER -

Bridging mechanisms of through-thickness reinforcement in dynamic mode I&II delamination

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Keywords

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Projects

Understanding Delamination Suppression at High Deformation Rates in Through-Thickness Reinforced Laminated Composites

Datasets

Z-pin high rate mode I and II experiments

Profiles

Professor Stephen R Hallett

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