Angelos FilippatosTechnische Universität Dresden | TUD · Dresden Center for Intelligent Materials (DCIM)
Angelos Filippatos
Dr.-Ing.
About
62
Publications
7,518
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323
Citations
Citations since 2017
Introduction
Mr. Dr.-Ing. Angelos Filippatos is a group leader at the Dresden Center for Intelligent Materials (DCIM) of the TU Dresden.
His scientific expertise is on the design and testing of multi-material structures under complex loading conditions, with a special focus on new methods for their in-situ structural integrity assessment. His main emphasis is to synergize multi-material engineering, parametric simulations and machine learning to discover and implement novel functionalities.
Additional affiliations
February 2021 - present
Position
- Group Leader
Description
- I am currently committed with focus on the cross-level, experimental-numerical investigation of the structure-property-process SPP relations of hierarchical structures through data-driven methods.
December 2017 - January 2021
Position
- Research Associate
Description
- Mr. Filippatos is strongly involved in the field of structural dynamics and diagnostics. His scientific experience is focused on high-speed composite rotors, vibration-based diagnostics, structural integrity and function integration. He is committed to several projects regarding function integration and smart structures at the development and testing of the project demonstrators.
March 2014 - November 2017
Education
September 2005 - October 2010
Publications
Publications (62)
A central process in composite lightweight engineering is the design of different fibre-reinforced parts. Certain steps during the design process have the potential that the overall workload can significantly be reduced, by the use of modern software tools. This often means that a compromise between optimization and increasing development costs mus...
Most products in automotive, aerospace, and household appliance industry are multi-material structures. Materials are connected through a variety of joining techniques with the aim of optimizing performance during production and operation phase. However, during recycling in the end-of-life phase, different materials combined in multi-material struc...
Due to their lightweight properties, fiber-reinforced composites are well suited for large and fast rotating structures, such as fan blades in turbomachines. To investigate rotor safety and performance, in situ measurements of the structural dynamic behaviour must be performed during rotating conditions. An approach to measuring spatially resolved...
The growing requirements for efficient and reliable high-performance rotors have led to an increased application of advanced fiber-reinforced composites. For an efficient feasibility analysis, analytical calculation methods for composite structures can provide a first design draft of typical composite components without cumbersome finite element mo...
Damage identification of composite structures is a major ongoing challenge for a secure operational life-cycle due to the complex, gradual damage behaviour of composite materials. Especially for composite rotors in aero-engines and wind-turbines, a cost-intensive maintenance service has to be performed in order to avoid critical failure. A major ad...
The innovation potential of lightweight design in its scientific and technical foundations lies in the systematic, i.e. integrated and cross-material consideration of the process chains. This consideration is one of the main goals of dahlia project - Digital Technologies for Hybrid Lightweight Structures. The end-to-end digitalisation of the develo...
The implementation of wind turbines as a source of sustainable, renewable energy is increasing. Although the prospects of renewable energy development are promising, ice accumulation on turbine blades still stands as a major operational issue. Excessive ice mass on turbine blades can lead to damage or total failure of the blades but also to the nac...
Function‐integrative lightweight engineering represents an essential element in modern design methods. Currently, there is a great need for the incorporation of sensors, actuators and electronics in novel, demand‐oriented components. In contrast to a subsequent, mostly adhesive bonding, structural integration offers numerous advantages, for example...
Composite materials are used for high-performance rotating blades, e.g. in turbines and wind power plants. Here, optical coherence tomography was used to visualize large areas of fibre-reinforcedpolymer discs at rotation speeds of up to 1200 rpm. These measurements allowed to visualize the fibre structure over large areas of the disc. By recording...
Polymer composite rotors offer promising perspectives in high-speed applications such as turbomachinery. However, failure modeling is a challenge due to the material's anisotropy and heterogeneity, which makes high-speed in situ deformation measurements necessary. The challenge is to maintain precision and accuracy in the environment of fast rigid-...
Composite structures undergo a gradual damage evolution from initial inter-fibre cracks to extended damage up to failure. However, most composites could remain in service despite the existence of damage. Prerequisite for a service extension is a reliable and component-specific damage identification. Therefore, a vibration-based damage identificatio...
Function-integrative textiles bear the potential for a variety of applications in the medical field. Recent clinical investigations suggest that the application of a function-integrative fabric could have a positive impact on currently applied diagnostic procedures of a specific type of tumour. In this context, the fabric should enable local warmin...
In-situ measurements of the deformation and of the structural dynamical behavior of moving composite structures, such as rotors made of glass fiber reinforced polymers (GFRP), are necessary in order to validate newly developed simulation models. Local methods like strain gauges and fiber Bragg gratings lack spatial resolution, while contactless opt...
The analysis of the structural dynamic behaviour of composite rotor–discs by a valid description of the eigenfrequencies and mode shapes can provide significant information for action-taking before a failure occurs. Specifically, vibration-based diagnostic methods, which are able to take into consideration the interdependencies and sequential chang...
Constrained layer damping treatments are widely used in mechanical structures to damp acoustic noise and mechanical vibrations. A viscoelastic layer is thereby applied to a structure and covered by a stiff constraining layer. When the structure vibrates in a bending mode, the viscoelastic layer is forced to deform in shear mode. Thus, the vibration...
A vibration excitation system (VES) in a form of an active coupling is proposed, designed and manufactured. The system is equipped with a set of piezoelectric stack actuators uniformly distributed around the rotor axis and positioned parallel to each other. The actuator arrangement allows an axial displacement of the coupling halves as well as thei...
Fibre-reinforced composite structures under complex loads exhibit gradual damage behaviour with degradation of effective mechanical properties and change of their structural dynamic behaviour. In case of composite rotors, this can lead to catastrophic failure if an eigenfrequency is met by the rotational speed. The description and simulation analys...
Fibre-reinforced composite structures subjected to complex loads exhibit gradual damage behaviour with the degradation of the effective mechanical properties and changes in their structural dynamic behaviour. Damage manifests itself as a spatial increase in inter-fibre failure and delamination growth, resulting in local changes in stiffness. These...
Fibre-reinforced composite structures under complex loads exhibit gradual damage behaviour with a degradation of effective mechanical properties and change of their structural dynamic behaviour. Damage manifests itself as spatial increase of inter-fibre failure and delamination-growth, resulting in local changes of stiffness. These changes affect n...
Fiber reinforced plastics (FRP) have a high potential for the application in high performance rotors as they provide high specific tensile strength and stiffness as well as low density. This combination enables composite rotors to run at very high rotational speeds. However, the complex mechanical behavior of FRP impedes accurate failure prediction...
A numerical methodology for the aerodynamic damping analysis of fibre reinforced rotors under consideration of varying stiffness due to damage is proposed. Therefore continuum damage mechanics approaches for textile reinforced composites are applied to composite rotors for the description of anisotropic damage evolution resulting in locally varying...
A growing number of people worldwide are permanently or temporarily dependent on a wheelchair. In order to improve the quality of life for wheelchair-users, it is important that the wheelchair offers the greatest possible comfort on the one hand and on the other hand enables many everyday situations without assistance, while being light enough to b...
The gradual damage behaviour of polar orthotropic glass-fibre reinforced epoxy disc-rotors and the resulting damage-dependent dynamic behaviour is experimentally investigated and described under propagating damage from a combination of out-of-plane and in-plane loads. The damage manifests itself as a spatial increase of inter-fibre failure and grow...
Glass fibre reinforced epoxy rotors, made using the Tailored Fibre Placement (TFP) method have been subjected to stepwise, increasing loading over a multi-stage test procedure. The introduced stresses cause gradual damage and non-linear corresponding changes of the dynamic behaviour which can be measured by non-destructive testing. Therefore, Exper...
As compressor blades are subjected to highly dynamic loads, there is a particular interest in determining their modal properties under operating condition. Furthermore, intensive research is conducted for the development of fibre-reinforced epoxy blades due to the high specific stiffness and strength as well as the high damping of composite materia...
Textile-reinforced thermoplastics exhibit outstanding mechanical properties, such as high specific strength and stiffness, and offer a variety of possibilities for functional integration. These properties make this novel material group a particular candidate for mass production of light-weight solutions. In order to fully exploit the high potential...
Increasing demands on the performance of rotating components as well as on the noise reduction in jet engines lead to higher dynamic requirements. Composite materials can contribute to a reduction of the vibration amplitudes due to their inherent advantageous damping behaviour and their high specific stiffness. A numerical prediction of the vibrati...
Integration of active elements as thermoplastic-compatible piezoceramic modules in lightweight compliant mechanisms offers the possibility to actively control its structural behavior by static, dynamic or vibro-acoustic loads. New active lightweight structures with material-integrated structural monitoring, energy-harvesting, or active vibration da...
The invention concerns a process for the production of a multi-material composite comprising a metal layer and a fibre-reinforced or non-reinforced first polymer layer, as well as an associated multi-material composite. It enables the precise adaptation of material properties and can thus make a decisive contribution to extending the service life o...
The present work provides a contribution to the area of vibration-based damage identification methods for composite rotors. Damage identification is understood as the damage detection in a structure including information regarding its damage type, location and extent.
As damage influences the effective stiffness and damping, it results in a change...
Compliant mechanisms with integrated actuators can enable new function-integrative structures through the elastic deformation of elements without the use of classical links and joints. For such designs, the mechanical behaviour of the mechanism has to be well known, because external loads, the utilised materials and the geometry of the structural p...
Logistics must be fast, with short cycles and at the same time cost efficient. It involves highly dynamic processes where automated storage and retrieval systems (AS/RS) play an important role in the whole process chain. Especially, the development goal in logistics is the achievement of high acceleration and speed values with lowest possible dead...
The paper presents a unique extension and application of the dynamic mechanical analysis (DMA) technique for the determination of heterogeneous mechanical material properties. Their values as well as their spatial distribution are major interest when analysing properties of post-damage materials. The proposed procedure incorporates longer than typi...
The use of integrated structural health monitoring systems for critical composite parts, such as wind turbine blades, fuselage and wing parts, is an promising approach to guarantee a safe and efficient operational lifetime of such components. Therefore, the integration of thick functional components like sensors, actuators and electronic components...
Future mobility applications are characterized by a high level of resource efficiency due to the application of novel lightweight materials and function-integrating, multi-material design concepts. Textile thermoplastic composites in particular pave the way for lightweight components characterized by highly specific mechanical properties and effici...
Am Institut für Leichtbau und Kunststofftechnik (ILK) der Technischen Universität Dresden entwickeln Wissenschaftler ein Versuchsgerät, das es ermöglichen soll, die diagnostische Leistung der bisherigen laborchemischen Testverfahren zu erhöhen und damit endokrine Tumore zuverlässiger auszuschließen. Dafür arbeiten die Leichtbauer mit Medizinern der...
The FiF demonstrator vehicle illustrates the great potential offered by the use of HYTT composites and the application of adapted lightweight construction methods in automotive engineering and also in other application areas such as aerospace, rail vehicles, or mechanical engineering in general. The solutions developed by the SFB 639 for demand-spe...
Der Einsatz von Faserverbundwerkstoffen als schwingungsdämpfende Materialien steht im Fokus des Forschungsprojekts FunHub. Gemeinsam entwickeln hier die Institute für Leichtbau und Kunststofftechnik (ILK) sowie für Technische Logistik und Arbeitssys-
teme (ITLA) der Technischen Universität (TU) Dresden neuartige schwingungsdämpfende Elemente für Re...
The high stiffness to weight ratio of glass fibre-reinforced polymers (GFRP) makes them an attractive material for rotors e.g. in the aerospace industry. We report on recent developments towards non-contact, in-situ deformation measurements with temporal resolution up to 200 μs and micron measurement uncertainty. We determine the starting point of...
Textile-reinforced thermoplastics exhibit outstanding mechanical properties such as high specific strength and stiffness as well as versatile function-integrating capabilities. These characteristics, in combination with a rapid and cost-effective manufacturing, premise this novel material group to be a suitable candidate for mass production of ligh...
Prüfungsantrag gemäß § 44 PatG ist gestellt. Die folgenden Angaben sind den vom Anmelder eingereichten Unterlagen entnommen (54) Bezeichnung: VERFAHREN UND VORRICHTUNG AN ROTORSYSTEMEN (57) Zusammenfassung: Die Erfindung bezieht sich auf das Gebiet des Maschinenbaus und betrifft ein Verfahren und ei-ne Vorrichtung, wie sie beispielsweise an Zentrif...
Based on a previous global collocation concept concerning the numerical solution of two-dimensional potential and elastostatic problems, this paper investigates its applicability to the eigenvalue analysis of acoustic cavities. The key point is to consider global approximation of the acoustic pressure within the entire cavity, the former based eith...
The invention relates to a device for adjusting and determining the blood flow plateau in an extremity of a patient, wherein the device (1) has a chamber (2) whose wall (3) encloses an interior (4), and the chamber (3) has at least one opening (5), for inserting at least part of the extremity (6, 7) into the interior (4), and at least one recess (1...
The in-situ characterization of the material behavior of glass-fiber reinforced polymer (GFRP) disc rotors under dynamic load is an important step towards the development of novel, lightweight materials for several applications, e.g. the aerospace industry. However, the dynamic rotor behavior is complex and difficult to determine. In order to devel...
Fibre reinforced plastic (FRP) rotors are lightweight and offer great perspectives in high-speed applications such as turbo machinery. Currently, novel rotor structures and materials are investigated for the purpose of increasing machine efficiency, lifetime and loading limits. Due to complex rotor structures, high anisotropy and non-linear behavio...
Fibre reinforced plastic (FRP) rotors are lightweight and offer great perspectives in high-speed applications such as turbo machinery. Currently, novel rotor structures and materials are investigated for the purpose of increasing machine efficiency, lifetime and loading limits. Due to complex rotor structures, high anisotropy and non-linear behavio...
Composite materials offer high strength and stiffness to weight ratios, adjustable directional material properties and exhibit gradual damage behaviour. The complexity of these materials and their parameter scatter combined with possible unpredicted events such as impact events at turbine blades or wind turbines contribute to the prediction uncerta...
The unique potential to integrate functional elements into fibre-reinforced components combined with the recent progress in the simulation models of composite materials provides new perspectives for reliability improvement of the next generation components. Such combination is presented on the example of a carbon-fibre reinforced composite plate wi...
Integration of functional elements into fibre-reinforced host structures provides the possibility for in situ monitoring of the structural integrity of critical components. In this study, a vibration-based monitoring function has been developed that allows the structural integrity identification of critical components. For this purpose, signal anal...
Impact-caused damages of composite rotors have an influence on their damage evolution which consequently affects the long-term operational capability and can lead to catastrophic failure prior to the designed lifetime. Therefore, the development of methods for reliable, early identification of the evolving damage is required. A relevant group of su...
Composite materials offer, in comparison to classical materials, high strength and stiffness to weight ratios, adjustable directional material properties and gradual damage behaviour. Due to such outstanding properties, a growing interest to use composite materials in weight-relevant applications of complex loaded structures is noticeable. Especial...
A concept of a combined material-integrated structural health monitoring and active vibration damping system is proposed. Using a common set of sensor and actuator components integrated in a composite rotor, the system allows the control of the structural dynamic behaviour under relevant operating conditions as well as the detection of a progressin...
The unique potential to integrate functional elements into fibre reinforced components combined
with the recent progress in the numerical simulation algorithms of multifunctional materials
provides new perspectives for reliability improvement of the next generation components. The
demonstration of such beneficial combination is presented in the art...
Projects
Projects (7)
The main vision of the planned project is a better understanding of the challenges, shortcomings and solutions regarding the pollution awareness in the two countries. A strategic cooperation to combat pollution and reduce the human footprint requires, however, overarching cooperation between main environment-focussed players on the Indian and German sides. The present project aims at bundling the existing contacts and activities and putting them at the service of increasing pollution awareness, e. g., by means of plastic waste reduction and recycling as well as return to design solutions allowing repair and overhaul.
Engineers from three Saxon Universities (TU Bergakademie Freiberg, TU Chemnitz and TU Dresden) together with the alliance „Leichtbau-Allianz Sachsen“ plan to develop novel digital processes for the production of tape enforced magnesium and aluminium light metal sheets. The project especially aims to provide innovations to the local industry.The joint research project r is funded by the State of Saxony and the European Union.
The aim of the project is to find the fundamental relationship between damage state and dynamic behaviour of fast rotating fibre-reinforced rotors. This requires the development of novel measurement systems that allow the simultaneous and in-situ measurement of damage state and dynamic behaviour. Additionally, experimentally validated simulation methods based on the occurring physical effects are required that predict the damage state of fast rotating fibre-reinforced rotors. For this purpose the unique Multipoint-Laser-Doppler-Distance measurement system is to be extended to allow for a simultaneous measurement of the global, damage-induced expansion of the rotor and the eigenfrequencies during rotation. Furthermore, measurement techniques for the volumetric measurement of local deformations and damages will be qualified and applied for the first time at fast rotating structures. The measurement systems will be used to validate and extend the simulation models.Beyond the fundamental, physical understanding of the damage-induced structural dynamic behaviour, novel in-situ measurement systems and practical design tools for future high-performance, fibre-reinforced rotors will be available as results.