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Determination of delamination damage in composites under impact loads

Johnson, Alastair F. and Toso-Pentecôte, Nathalie (2008) Determination of delamination damage in composites under impact loads. In: Delamination behaviour of composites Woodhead Publishing and Maney Publishing. [561]-[585]. ISBN 978-1-84569-244-5.

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Abstract

This contribution describes recent progress on materials modelling and numerical simulation of fibre reinforced composite shell structures subjected to high velocity impact loads. A Continuum Damage Mechanics (CDM) model for fibre reinforced composites is applied to model both in-ply damage and delamination failure during impact loading. The CDM model has been implemented in a commercial explicit finite element (FE) code in which a laminate is modelled by stacked shell elements with cohesive interfaces which fracture when a delamination failure energy criterion is reached. A comparison of structural response and failure modes from numerical simulations is then conducted. In particular, emphasis is put on the influence of delamination damage on the impact behaviour of composite plates and stiffened panels. Delamination damage is measured in low velocity drop tower impact tests and also in high velocity gas gun tests on composite plates with steel projectiles carried out at the DLR. In both types of test it is seen that at lower impact energies delamination damage was often the main damage mechanism, whereas at higher impact energies there was fibre fracture and plate penetration by the hard projectiles. In this case, the presence of some delamination provides an additional energy absorption mechanism in the composite plate, which can reduce complete penetration. It follows that modelling and analysis of impact damage require composites failure models which include both in-plane ply damage and delamination damage.

Document Type:Contribution to a Collection
Title:Determination of delamination damage in composites under impact loads
Authors:
AuthorsInstitution or Email of Authors
Johnson, Alastair F.UNSPECIFIED
Toso-Pentecôte, NathalieUNSPECIFIED
Date:2008
Journal or Publication Title:Delamination behaviour of composites
Refereed publication:Yes
In ISI Web of Science:No
Page Range:[561]-[585]
Editors:
EditorsEmail
Sridharan, SrinivasanUNSPECIFIED
Publisher:Woodhead Publishing and Maney Publishing
ISBN:978-1-84569-244-5
Status:Published
Keywords:delamination, impact, composite modelling
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Robust Rotorcraft
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Structural Integrity
Deposited By: Nathalie Toso
Deposited On:14 Jan 2009
Last Modified:27 Apr 2009 15:35

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