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Tsirka Kyriaki

Tsirka Kyriaki
Title: Study of the graphitic reinforcement of hierarchical epoxy matrix composites
In the context of this PhD dissertation, graphitic hierarchical structures were studied which are used as secondary reinforcements in fiber-reinforced polymer composites with structural applications and multi-functionalities. More specifically, hierarchical reinforcing structures were developed by i) growing multi-wall carbon nanotubes (CNTs) via catalytic chemical vapor deposition; and ii) depositing CNTs from aqueous suspensions / inks on the carbon fiber surface. The work was divided into two axes. The first axis focused on the synthesis and optimization of hierarchical reinforcements and the extensive characterization of their structure and morphology through a variety of analytical technics. The second axis targeted the study of the mechanical properties of the hierarchical fibers and the properties of the interfaces formed between them and the epoxy matrix. The study of the mechanical properties of the interface of the hierarchical composites was carried out using Raman spectroscopy and mechanical tests on model composite materials. Overall, the present work, following a biomimetic approach, studied the synergies between the different graphitic structures that constitute hierarchical carbonaceous reinforcements and demonstrated their dual nature as bearing and multifunctional elements, which is enhanced through the hierarchy of their structure.



Kosarli Maria

Kosarli Maria
Title: Novel concepts for optimizing the self-healing processes in advanced aerospace composite structures.
Fiber Reinforced Polymers (FRPs) are among the most important technological materials in the industrial and research communities due to their excellent specific properties. Their excellent modulus of elasticity in combination with the relatively low density and corrosion resistance are some of the FRPs desirable properties. However, the FRPs relatively low fracture toughness can result to undesirable fracture phenomena that could compromise the materials structural integrity. The approach of self –healing materials expands the current conventional damage tolerance or/and repair approaches and has attracted significant attention in the research community the last decade. The scope of this PhD research is to develop and optimize a self-healing approach and integrating the SH technology into FRPs. The roadmap for the investigation and integration of the proposed SH approach includes (i) the selection of the self-healing approach, (ii) the selection of FRPs matrix material, (iii) development of a SH-FRP material and (iv) the manufacturing of a demonstrating structure with SH-capabilities. 


Foteinidis Georgios

Foteinidis Georgios

 Title: Smart micro- and nano-composites: non-destructive evaluation of production and /or response to various loadings
Structural Health Monitoring is a vital tool enabling on-line damage detection and topography on epoxy matrix reinforced composites. Among several SHM techniques, the ones related with the electrical response to damage are capable of providing information about the structural degradation of the material with high sensitivity and precision. The aim of this dissertation is the conversion of a conventional composite into a multifunctional material to provide crucial information for Structural Health Monitoring (SHM). A specific lamination sequence of carbon and glass fabrics in combination with a ternary epoxy matrix will offer SHM topography capabilities. The matrix reinforcement will be consisted of homogenously dispersed Carbon Nanotube and Carbon Black. A sinusoidal electric field will be applied between the established local capacitors using Impedance Spectroscopy technique. The layout of the laminas will enable the damage assessment after medium velocity impact. Hence, the damaged area will be depicted in 2D and 3D contour topographical images which will reveal useful information about the structural integrity of the composite. Additionally, the integration of self-healing capabilities will be studied in order to achieve the manufacturing of a smart composite with wide range of functionalities.



Karalis Georgios

Karalis Georgios
Title: Development of technologies for thermoelectric energy harvesting with embedded multifunctional properties from advanced composite materials
Multifunctional structural composites are an extremely interesting research field in advanced building materials technology because beyond the structural functions (high mechanical strength with reduced specific weight) they offer individual capabilities for simultaneous implementation of various non-structural functions such as structural integrity monitoring, temperature control, deformation or damage detection, storage, harvesting and energy generation. Given the urgent need for alternative forms of energy, thermoelectric power generators promise major applications in converting the commonly lost thermal energy into electricity. The nanostructures with the high thermoelectric efficiency developed due to their two-dimensional nature are virtually impossible to apply directly to large-scale structures. Thus, in order to exploit their unique properties, their incorporation into three-dimensional materials is required. This PhD dissertation will focus on the targeted research effort to improve the Seebeck coefficient of the carbon fibers which is the reinforcing phase through hierarchical nanostructures so that the ability of the final polymer matrix composite structures to have additional functional properties of the thermoelectric generator (Thermoelectric Element Generator-TEG) for the purpose of energy harvesting, exploiting the thermoelectric effect.



Polymerou Anastasia

Polymerou Anastasia
Title: Advanced structural composites with architectured design for selected functionalities
In modern society, electronic systems and telecommunications are the most widely used technologies, as they play an important role in communication both on the earth and in space. However, electromagnetic interference (EMI) is an important issue for modern communication and electronic systems. Electromagnetic pollution is the main cause of damage to electronic devices, equipment and systems used in critical applications (eg in medicine, army, aerospace electrical systems, etc.). The causes of EMI are numerous and are due to both technical and natural sources. The subject of this PhD thesis is the study and optimization of the multi-functionality of hybrid and hierarchical composite materials. More specifically, the effect of various reinforcing phases on the efficacy of composites as electromagnetic interference (EMI shielding) materials will be studied. The incorporation of these structures into the composites will take place either by spreading them into the native phase or by placing them on the surface of the fibers (hierarchical approach). The aim is to improve the mechanical properties and to optimize the functionality of EMI shielding through the appropriate architectural design of the structure and the exploitation of specific properties of the component phases.



Mytafides Christos

Mytafides Christos
Title: Smart coatings for targeted functionalities in advanced structural composite materials
The great breakthroughs of smart materials and nanotechnology in the past decades, has emerged as a particularly promising route in the field of advanced composite materials. The biomimetic approach of nanostructured interfaces for hierarchical composites (micro-scale reinforcing fibers coated with nanoparticle-based layers) to Carbon Fiber Reinforced Polymers (CFRPs), exhibiting impressive durability and multifunctionality (simultaneously mechanical and electrical properties, including high mechanical strength, energy harvesting & self-diagnostic capability). The innovation of this PhD thesis is related to the fact that, apart from the materials engineering to tailor the smart coatings final properties endowed to the reinforcement and to the laminate 3D composites, the structural character will be also considered. Furthermore, optical (photo-sensing properties), thermal (thermoelectric energy harvesting) and piezo/mechanical fields (strain sensors and/or piezoelectric energy harvesting) will be mainly investigated, as well as the mechanism that the multifunctional composite is responding in bulk will be investigated in detail. The ultimate foundation character of this PhD is the realization of all the functionalities at a demonstrator structure/device level that will be able to show the functionality upon being exposed to the specific field.



Orfanidis Savvas

Orfanidis Savvas
Title: Development and study of novel advanced composite material simulating the operation environment.
A wide range of advanced composite materials, polymers reinforced with glass or carbon fibers, are used as light weight, high strength and high corrosion resistance reinforcing structures. These materials are widely used in transportation: terrestrial (buses, trains), marine (yachts and boats) and aerospace (parts of the shaft and wings). Such materials during their operation function under dynamic loads, continuous vibrations, fatigue, external forces, deformations and harsh environmental conditions. In such environments, there is a need to periodically evaluate the structural integrity in a non-destructive technique in order to avoid dangerous anomalies such as laminar detachment, breakage of fibers, cracks,etc.An innovative method for operating quality control of the structure is guiding waves because they can travel long distances on structures where they consist of flat metal substrates without significant attenuation. Guiding waves can therefore respond to large areas of inspection or control from a remote location with a relatively small number of non-destructive evaluation (NDE) or structural health monitoring (SHM) ).The main objective of the present study will be the effect of the microstructure on the mechanical behavior of the composite materials in order to optimize their mechanical and elastic properties. The experimental study will be implemented through non-destructive testing techniques, ultrasound and Nuclear Magnetic Resonance (NMR) spectroscopy.

 

 

 

 

 

 

 

Academic Staff
 paipetis

Alkiviadis Paipetis

Professor - CSM Laboratory Director

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Tel.: (+30) 26510-08001

Fax: (+30) 26510-08054

 mparkoula

Nektaria Marianthi Barkoula

Professor

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Tel.: (+30) 26510-08003

Fax: (+30) 26510-08054

Postdoctoral researchers
 lazaros tzounis

Lazaros Tzounis

Postdoctoral Researcher

Tel.: (+30) 6947994584

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Tsirka Kyriaki

Kyriaki Tsirka

Postdoctoral Researcher

Tel.: (+30) 26510-26510-0 9025

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Ph.D. Thesis Abstract
PhD students
 foteinidis

George Fotinidis

Materials Engineer

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Ph.D. Thesis Abstract

Karalis

George Karalis

Materials Engineer

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Ph.D. Thesis Abstract
Kosarli Maria

 

Maria Kosarli

Materials Engineer

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Ph.D. Thesis Abstract
Christos Mytafides

Christos Mytafides

Civil Engineer

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Ph.D. Thesis Abstract
Polumerou Anastasia

Αnastasia Polymerou

Materials Engineer

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Ph.D. Thesis Abstract
vareli

Ioanna Vareli

Materials Scientist

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Tel.: (+30) 26510-09008

Ph.D. Thesis Abstract

koutsolis 1

Labros Koutsotolis

Civil Engineer

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Ph.D. Thesis Abstract

garavela

Katerina Garavela

Materials Engineer

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Ph.D. Thesis Abstract

Τεχνικό Προσωπικό
 georgosopoulou

Marilena Georgosopoulou

Materials Engineer

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Tel.: (+30) 26510 0 9024

drogas

Christos Drougkas

Technician

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Tel.: (+30) 26510 0 8006

In our laboratory, they also carry out their research 5 Postgraduate Students and 20 Undergraduate Students.

Additional equipment:
• 2 Grant GP 200 precision stirred thermostatic baths / circulators. Capacity: 25l, working temperature range: -30 up to +200oC depending on liquid
• Heating bath by Λάππας ΑΕ
• Kern ALJ-220-4M high precision analytical weigh scale, readability: 0.1mg and weighing range: 120g
• Tip Sonicator Hielsher UP400S, 400 W output power with amplitude and pulse adjustment capability
• In-house manufactured ballistic impact testing apparatus
• In – house manufactured extruder and fiber spinning apparatus
• Electrochemical impedance spectroscopy
• 2 Agilent 34401A Multimeters

 

2020      Innovation-el 

innovation el logo

Innovation-el is a large-scale distributed research infrastructure of cutting-edge facilities that covers all fronts from materials synthesis, characterization and functionalization to micro-nanofabrication, device/system design, development and testing. The network is complemented by multiscale computer simulations and theory, and is supported by more than 200 skilled scientists of long-standing expertise and interdisciplinary experience.
CSML participates in the project with Raman spectroscopy equipment.
INNOVATION-EL is implemented under the “Reinforcement of the Research and Innovation Infrastructure” Action (MIS 5002772), funded by the Operational Programme “Competitiveness, Entrepreneurship and Innovation” (NSRF 2014-2020) and co-financed by Greece and the European Union (European Regional Development Fund)

http://innovation-el.staging2.scify.org/

espa logo

2018 - Hierarchical multifunctional composites with thermoelectrically powered autonomous structural health monitoring for th3 aviation industry

harvest logo

 

http://www.harvest-project.eu/

HARVEST is a 36 month project that will cover the whole value chain of Fiber Reinforced Plastics (FRPs) so as to provide novel FRPs capable of harvesting and storing thermoelectric energy. In addition, HARVEST will develop a purposefully made electronic circuit module so as to power SHM inherent functionalities and provide information on the structural health of the components.

To this end, HARVEST is composed of an interdisciplinary consortium of academics, key technology providers, industrial/SME partners and standardization experts to ensure the applicability of the developed materials in future aerospace applications.

HARVEST project concept:
Development of multifunctional TEG-enabled structural composite materials for the Aeronautics sector.
HARVEST project will employ breakthrough technologies combining bio-inspired hierarchical ThermoElectric Energy Generating (TEG) carbon fiber (CF) reinforcements with novel thermoset matrix systems (3R Repair-Recycle-Reprocess technology). The “hierarchical” reinforcement will be comprised from a micron-scale CF coated with nano-scaled particles. The aim is to develop multifunctional TEG-enabled structural composite materials for the Aeronautics sector.

https://cordis.europa.eu/project/rcn/216003/factsheet/en

harvest rnd project sml

 eu flagThis project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 769140.

 

2018 - ThermoformAble, repairable and bondable smart ePOXY based composites for aero structures

https://www.airpoxy.eu/

airpoxy logoComposite & Smart Materials Laboratory (CSML) is delighted to announce that it will be participating in the AIRPOXY project from September 2018. AIRPOXY is a 42-month collaborative project funded by the European Commission in the HORIZON 2020 framework with a total budget of €6.5m. The aim of this project is to reduce production & MRO (maintenance, repair and overhaul operations) costs of composite parts in aeronautics. This will be achieved by introducing a novel and new family of enhanced composites that preserve all the advantages of conventional thermosets, while showing Re-processability, Reparability and Recyclability (3R). AIRPOXY will develop new thermoset resins from TRL3 (Technology Readiness Level) to TRL5 through two representative demonstrators of aircraft panels.
CSML will implement structural health monitoring (SHM) technologies in order to detect in service damage and analyze the damage tolerance of the new composites. CSML will test various specimens geometries for different levels of damage (matrix cracking, delaminations, etc.) and then, develop and optimize the SHM technologies using a variety of Non-Destructive (NDE) techniques. In the demonstrator level, CSML will integrate the developed SHM technologies for validation and further optimization.
The AIRPOXY project is led by CIDETEC and it is formed by a multidisciplinary consortium of 11 partners from 6 countries; CIDETEC (Spain) as resin inventor, key technology providers IVW (Germany) (thermoforming & welding), Eurecat (Spain) (RTM), Coexpair (Belgium) (SQRTM), University of Ioannina/Composite & Smart Materials Lab (Greece) (Structural Health Monitoring); Altair (France) (process simulation software), aircraft components manufacturers (EIRE, Ireland); IDEC, Spain); SONACA, Belgium), standardization experts UNE (Spain) and an aeroconsultancy (ARTTIC, France).

https://cordis.europa.eu/project/rcn/216013/factsheet/en

 

eu flag This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No769274.


2013- 2016  HIPPOCRATES, Small or Medium Scale (Aeronautics FP7)  «SELF-HEALING POLYMERS FOR CONCEPTS ON SELF-REPAIRED AERONAUTICAL COMPOSITES»

 • HIPOCRATES is a Collaborative Project co-funded by the 7th Framework Programme of the European Community. Further information on European Community research programmes can be found on the Cordis web site.

• The aim of HIPOCRATES project is to serve as a platform for developing the required knowledge, technologies, procedures and strategies to deliver self-repairing composite aero-structures, while defining the roadmap to achieve the vision of self-repairing composite structures.

In order to achieve this aim, the objectives of HIPOCRATES research and development activities are set to give answers in certain directions:

• To provide experimental evidence to meet the State-of–the-Art shortcomings and broaden the understanding of the self-healing mechanisms.

• To develop strategies and respective procedures for enabling self-repairing of composite materials by critically analyzing the established techniques.

• To establish novel routes and technologies for utilizing the self-healing functionalities in aero-structures.

• To develop new protocols and testing methods in order to specifically quantify the healing magnitude.

 https://cordis.europa.eu/project/rcn/111157/brief/en

iapet

Bonded composite patches are ideal for aircraft structural repair as they offer enhanced specific properties, case-tailored performance and excellent corrosion resistance. Bonding further eliminates stress concentrations induced from mechanical fastening of metal sheets, seals the interface, and reduces the risk of fretting fatigue between the patch and the component.

IAPETUS focuses on the use of improved composite repair systems offering (i) the introduction of new on-aircraft simplified curing technologies, (ii) enhanced fatigue and damage tolerance properties and (iii) integrated damage sensing. This will be performed via the incorporation of carbon nanotubes (CNTs) both in the composite matrix of the repair patch as well as in the adhesive. The use CNT modified repair concept will lead to improved performance in the blunting of stress concentrations in the parent surface and the inhibition of crack propagation, leading to enhanced fatigue resistance at the locus of the repair as well as for the patch itself.

At the same time, the patch repair acquires additional functionalities. The CNT doped Carbon Composites can be tailored to reduce the galvanic corrosion in repaired Aluminium structures. As the patch becomes electrically and thermally conductive thermal energy can be infused in the patch either by direct resistance heating (using the patch itself as heating element via the application of electrical voltage) or by induction heating, to instigate a uniform matrix polymerization since the patch system appears improved thermal conductivity too. The electrically conductive percolated network can be employed to assess the damage within the patch and its interface with the repaired structure, as conductivity changes mirror the damage in the doubler/substrate system by tracing micro damage through breaches in the CNT network; thus, the structural efficiency monitoring at any stage in the service life of the aerostructure can be assessed non-destructively.

IAPETUS is realised by 7 industrial partners (Fundación INASMET Spain, PZL-Swidnik Poland, Huntsman Advanced Materials GmbH Switzerland, Integrated Aerospace Sciences Corporation (INASCO) Greece, DAHER Aerospace France, GMI AERO France, Hellenic Aerospace Industry SA Greece) and 3 Universities (University of Ioannina Greece, University of Sheffield UK, University of Patras Greece).

 https://cordis.europa.eu/project/rcn/91015/factsheet/en

 

News

Multifunctional Composite Materials

Guest Editor: Prof. Dr. Alkiviadis S. Paipetis

https://www.mdpi.com/journal/applsci/special_issues/multifunctional_composite_materials

 

Special Issue Information

Dear Colleagues,
Composite materials have been studied for several decades already. Particularly in the last decade, the use of structural composites materials has literally been booming in the aeronautics and automotive industry. This is marking a notable change in design mentality, i.e., the tailoring or “architecturing” of material in accordance with structural needs, a possibility uniquely offered by advanced composites. It is this mentality that gave birth to the next generation of composites, that of multifunctional composite materials. These materials made “by design” possess the required improved specific properties but are also equipped with additional properties which impart to them other functionalities, which may be structural or nonstructural.
To this aim, the hybridization of otherwise “traditional” composites has been widely studied. A typical case study is that of embedding nano-scaled reinforcement into the matrix of usually micro-scale reinforced systems, with a view to both enhancing the matrix dominated properties as well as imparting multifunctionality. In the literature, the additional functionalities provide diverse nonstructural capabilities, such as inherent structural health monitoring, sensing and actuation, power harvesting, and power storage, in addition to structural ones such as wear resistance, morphing or self-healing. The parallel structural and nonstructural capabilities of the new generation composites aim to enhance product life and increase product utility with minimum structural aggravation.
Functionalities imparted to the materials may be passive, active or even adaptive. For example, a material is subjected to a certain field during its service life. Thus, the material has to first sense the field effect, and, if it possesses some degree of “awareness”, evaluate it and even respond so as to adapt in order to retain its performance requirements. To perform these functionalities, there are power and coupling requirements. Additional to these requirements, the reliability and durability of such systems is also a major issue, as the functional properties need to extend throughout the service life of the material. Finally, one the major challenges related to multifunctionality is the provision of engineering to integrate these functionalities in the composite structure at a system level, whereby the architectured composite system will be enabled to perform the full cycle, i.e., sense–evaluate–react, in response to the external stimuli, be they mechanical, environmental or other.
This is an outline of the issues that form the scope of this Special Issue. Research papers are invited in relation to multifunctional advanced composite materials, smart materials, sensing and self-diagnosis, actuation and morphing, inherent energy harvesting and storage capabilities, environmental property enhancement, electromagnetic shielding, and in any other field where the materials by design perform in diverse ways so as to respond successfully to their service conditions.

Prof. Dr. Alkiviadis S. Paipetis
Guest Editor

 

Keywords

  • self-sensing and self diagnosis
  • self-healing
  • actuation and morphing
  • electromagnetic shielding
  • power harvesting and storage
  • structural health monitoring

CSML as the coordinator of the H2020 “HARVEST” project organizes a dissemination session for the project at the 9th International Conference on Innovation in Aviation and Space (EASN) which will be held in Athens on 4th September 2019. More Information can be found under https://easnconference.eu/home.

Visit of Klaus Friedrich, Emeritus Professor and Research Consultant, Institute for Composite Materials (IVW GmbH)
Seminar entitled: “MARKETS AND TRENDS IN THE APPLICATION OF POLYMER COMPOSITES”,
Wednesday 12 June 2019 at 11:00 am, at the premises of our Department, room ΚΥ1

The 18th international conference on fracture and damage mechanics (FDM 2019) will take place in Rodos (Rhodes), Greece. The conference series has the support of the experts in the field of fracture and damage mechanics and has become established as a leading international forum for presentation latest research. The high quality researches presented at the previous meetings are archived in conference proceedings published in book form. In addition special issues in leading journals such as International Journal of Fracture, Engineering Fracture Mechanics and Key Engineering Materials have been devoted to the work presented at the meeting. The proceedings one the 18th international conference will be published in the Journal of Key Engineering Materials and distributed to the delegates at the conference..

Conference organisers:
Professor Alkis Paipetis
University of Ioannina
and
Professor Ferri M.H.Aliabadi,
Imperial College, London

For further information please visit:
http://fdm.engineeringconferences.net/new/

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