scholarly journals Towards the development of novel self-sensing and self-healing methodologies in polymer matrix composites

2017 ◽  
Author(s):  
Δημήτριος Μπέκας
Keyword(s):  
Mechanical Performance ◽  
Polymer Matrix Composites ◽  
Self Healing ◽  
Matrix Composites ◽  
Damage Mechanisms ◽  
Frp Composites ◽  
Industrial Sectors ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Non Destructive

Fibre reinforced polymer (FRP) composites are becoming excellent candidates to address significant weight reductions in several industrial sectors such as the aerospace, automotive, naval and renewable energy. The Achilles' heel of advanced FRP composites centers around the poor interlaminar fracture toughness that may lead to undetected damage within the microstructure deteriorating the mechanical performance. The purpose of the present work unfolds in two axes, (i) to develop a novel Non- Destructive Evaluation technique based on Impedance Spectroscopy for the damage assessment of nanomodified FRP composites. This study aims to providing an insight in the damage mechanisms that occur in FRPs during their active lifetime under different loading scenarios (mechanical or environmental loading), (ii) to develop and employ three “tailor-on-demand” self-healing strategies to counterbalance the aforementioned damage mechanisms and restore specific functionalities in the composite. The healing performance of all the adopted self-healing concepts showed remarkable results both at polymer and composite level.

scholarly journals Characterisation of Natural Fibre Reinforcements and Composites

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Richard K. Cullen ◽  
Mary Margaret Singh ◽  
John Summerscales
Keyword(s):  
Polymer Matrix Composites ◽  
Natural Fibre ◽  
Natural Fibres ◽  
Matrix Composites ◽  
Principal Candidates ◽  
Reinforced Polymer ◽  
Ecological Implications ◽  
Fibre Reinforced Polymer ◽  
Eu Directives ◽  
Plant Stem

Recent EU directives (e.g., ELV and WEEE) have caused some rethinking of the life cycle implications of fibre reinforced polymer matrix composites. Man-made reinforcement fibres have significant ecological implications. One alternative is the use of natural fibres as reinforcements. The principal candidates are bast (plant stem) fibres with flax, hemp, and jute as the current front runners. The work presented here will consider the characterisation of jute fibres and their composites. A novel technique is proposed for the measurement of fibre density. The new rule of mixtures, extended for noncircular cross-section natural fibres, is shown to provide a sensible estimate for the experimentally measured elastic modulus of the composite.

Bioinspired Vasculatures for Self-Healing Fibre Reinforced Polymer Composites

2011 ◽  
Author(s):  
Chris Norris ◽  
Ian Bond ◽  
Richard Trask
Keyword(s):  
Polymer Composites ◽  
Self Healing ◽  
Internal Damage ◽  
Impact Compression ◽  
Scan Testing ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Microscopic Evaluation ◽  
Fibre Reinforced Polymer ◽  
Post Impact

Self-healing in fibre reinforced polymer (FRP) composites is an active area of research, principally aimed at restoring the losses in mechanical strength associated with impact induced damage. This bioinspired function may be imparted upon a composite structure via the embedment of a vasculature that is capable of delivering functional agents from an external reservoir to regions of internal damage. A simple segregated vasculature design incorporated into a FRP via a ‘lost wax’ process was found to facilitate a self-healing function which resulted in an outstanding recovery (≥97%) in post-impact compression strength. The process involved infusion of a healing resin through the vascule channels. Resin egress from the backface damage, ultrasonic C-scan testing and microscopic evaluation all provide evidence that sufficient vascule-damage connectivity exists to confer a reliable and efficient self-healing function.

scholarly journals Fatigue tests, self-healing of polymer-matrix composites in unmanned aerial vehicles

2018 ◽  
Vol 48 (1) ◽  
pp. 83-106
Author(s):  
Sławomir Augustyn ◽  
Rafał Kowalski
Keyword(s):  
Composite Materials ◽  
Polymer Matrix Composites ◽  
Stress Test ◽  
Fatigue Tests ◽  
Fiber Reinforced Polymer ◽  
Self Healing ◽  
Matrix Composites ◽  
Four Point Bending ◽  
Reinforced Polymer ◽  
Initial Load

Abstract This publication presented the main issues related to fatigue of polymer composite materials. It was featured a fatigue stress test based on composite sample, made of carbon fiber-reinforced polymer, using the four-point bending method. The test was carried out with the initial load and using positive load cycles. The perspectives of diagnostics and self-healing of composite materials, including intelligent materials, were also presented.

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