A Simplified Layered Beam Approach for Predicting Ply Drop Delamination in Thick Composite Laminates

Khong W Gan; Giuliano Allegri; Stephen R Hallett

doi:10.1016/j.matdes.2016.06.105

A Simplified Layered Beam Approach for Predicting Ply Drop Delamination in Thick Composite Laminates

Khong W Gan, Giuliano Allegri, Stephen R Hallett

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Abstract

The prediction of delamination onset is a challenging task in the design of thick tapered composite laminates, where multiple ply terminations (“drop-offs”) are present. This paper addresses the development of a global-local finite element-based design approach for tapered laminates, whereby layered Timoshenko beam models are employed to predict delamination initiation from individual drop -offs. This modelling strategy provides a fast and conservative method for evaluating the strength of tapered composite laminates. Parametric test cases are presented in order to validate the methodology and understand its limitations. Finally, the application of the tool to a relatively thick tapered composite test specimen comprising multiple ply-drops is demonstrated.

Original language	English
Pages (from-to)	570-580
Number of pages	11
Journal	Materials and Design
Volume	108
Early online date	7 Jul 2016
DOIs	https://doi.org/10.1016/j.matdes.2016.06.105
Publication status	Published - 15 Oct 2016

Structured keywords

Composites UTC

Keywords

Composite
Laminate
Ply Drop-Off
Delamination
Numerical Analysis

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10.1016/j.matdes.2016.06.105

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This is the final published version of the article (version of record). It first appeared online via Elsevier at http://www.sciencedirect.com/science/article/pii/S026412751630867X. Please refer to any applicable terms of use of the publisher.
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Gan - JMAD 2016 - Analytical ply drop design - pre-print
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Professor Giuliano Allegri
- Giuliano.Allegribristol.acuk
- School of Civil, Aerospace and Design Engineering - Professor of Structural Integrity of Composites
- Composites University Technology Centre (UTC)
- Bristol Composites Institute (ACCIS)
Person: Academic

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title = "A Simplified Layered Beam Approach for Predicting Ply Drop Delamination in Thick Composite Laminates",

abstract = "The prediction of delamination onset is a challenging task in the design of thick tapered composite laminates, where multiple ply terminations (“drop-offs”) are present. This paper addresses the development of a global-local finite element-based design approach for tapered laminates, whereby layered Timoshenko beam models are employed to predict delamination initiation from individual drop -offs. This modelling strategy provides a fast and conservative method for evaluating the strength of tapered composite laminates. Parametric test cases are presented in order to validate the methodology and understand its limitations. Finally, the application of the tool to a relatively thick tapered composite test specimen comprising multiple ply-drops is demonstrated.",

keywords = "Composite, Laminate, Ply Drop-Off, Delamination, Numerical Analysis",

author = "Gan, {Khong W} and Giuliano Allegri and Hallett, {Stephen R}",

year = "2016",

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doi = "10.1016/j.matdes.2016.06.105",

language = "English",

volume = "108",

pages = "570--580",

journal = "Materials and Design",

issn = "0261-3069",

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TY - JOUR

T1 - A Simplified Layered Beam Approach for Predicting Ply Drop Delamination in Thick Composite Laminates

AU - Gan, Khong W

AU - Allegri, Giuliano

AU - Hallett, Stephen R

PY - 2016/10/15

Y1 - 2016/10/15

N2 - The prediction of delamination onset is a challenging task in the design of thick tapered composite laminates, where multiple ply terminations (“drop-offs”) are present. This paper addresses the development of a global-local finite element-based design approach for tapered laminates, whereby layered Timoshenko beam models are employed to predict delamination initiation from individual drop -offs. This modelling strategy provides a fast and conservative method for evaluating the strength of tapered composite laminates. Parametric test cases are presented in order to validate the methodology and understand its limitations. Finally, the application of the tool to a relatively thick tapered composite test specimen comprising multiple ply-drops is demonstrated.

AB - The prediction of delamination onset is a challenging task in the design of thick tapered composite laminates, where multiple ply terminations (“drop-offs”) are present. This paper addresses the development of a global-local finite element-based design approach for tapered laminates, whereby layered Timoshenko beam models are employed to predict delamination initiation from individual drop -offs. This modelling strategy provides a fast and conservative method for evaluating the strength of tapered composite laminates. Parametric test cases are presented in order to validate the methodology and understand its limitations. Finally, the application of the tool to a relatively thick tapered composite test specimen comprising multiple ply-drops is demonstrated.

KW - Composite

KW - Laminate

KW - Ply Drop-Off

KW - Delamination

KW - Numerical Analysis

U2 - 10.1016/j.matdes.2016.06.105

DO - 10.1016/j.matdes.2016.06.105

M3 - Article (Academic Journal)

SN - 0261-3069

VL - 108

SP - 570

EP - 580

JO - Materials and Design

JF - Materials and Design

ER -

A Simplified Layered Beam Approach for Predicting Ply Drop Delamination in Thick Composite Laminates

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