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The impact and compression-after-impact behaviour of CFRP after double impacts in different locations
File(s)
Author(s)
Brooks, Richard
Liu, Jun
Joesbury, Adam
Harper, Lee
Liu, Haibao
Type
Journal Article
Abstract
The present paper investigates the low-velocity impact behaviour and the compression-after-impact (CAI) behaviour of carbon-fibre reinforced-plastic (CFRP) composite panels after two impacts in different locations on a test coupon. The effect of changing the separation distance between the two impacts, as well as changing the impact energy, is examined by a comparison of C-scan damage maps and the CAI load versus deflection behaviour. It is shown that impacts that are close to one another lead to a linking of the delamination footprints at each impact site. Further, that increasing the impact separation distance, for the same impact energy, leads to an increase in the area of the initial delamination damage footprint, until a separation distance is reached when two completely separate damage zones are formed. As to be expected, the delamination damage area increases, and the residual compressive strength after impact (termed the ‘CAI strength’) decreases with an increasing impact energy. An interesting observation is that the residual compressive strength generally increases with increasing impact separation distance.
Date Issued
2025-04-21
Date Acceptance
2025-03-13
Citation
Strain: an international journal for experimental mechanics, 2025, 61 (2)
URI
URL
DOI
ISSN
0039-2103
Publisher
Wiley
Journal / Book Title
Strain: an international journal for experimental mechanics
Volume
61
Issue
2
Copyright Statement
© 2025 The Author(s). Strain published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Identifier
10.1111/str.70006
Subjects
CFRP composite
compression after impact
delamination damage
low-velocity impact behaviour
multiple impacts
Publication Status
Published
Article Number
e70006
Date Publish Online
2025-04-21