Auf dem Weg zu einer kooperativen Promotion

Auf dieser Seite sind die Doktoranden an unserem Department in alphabetischer Reihenfolge aufgelistet, die von ihrem Betreuer hier angemeldet wurden. Die Partneruni für die kooperative Promotion ist angegeben, wenn von dort bereits eine Betreuungszusage vorliegt. Genannt wird das Promotionsthema oder das Forschungsprojekt (gegebenenfalls mit Link). Soweit bereits Publikationen vom Doktoranden vorliegen wird auf diese über das Repositorium der HAW Hamburg verlinkt.

Olivares Ferrer, Aurelio Jose (M.Sc.)

Betreuender Professor:  Prof. Dr.-Ing. Dipl.-Kfm. Markus Linke

Name der Universität : Universitat Politècnica de València

Forschungsprojekt: Residual strength and delamination growth prediction in carbon fiber reinforced plastics components with re-infiltrated barely visible impact damage

Publikationen:    Liste der Veröffentlichungen

The goal of this PhD project is to investigate models and methods for determining the residual strength and delamination growth of re-infiltrated barely visible impact damages (BVID) in carbon fiber reinforced plastics (CFRP) components. This type of damage must be repaired in civil aviation and, due to approval requirements, the damaged area is removed and replaced by a riveted patch, which is a high time-consuming and cost-intensive method. As a result, a certification method for an alternative BVID repair technique is being investigated, in which the damage is not removed but stabilized by resin infiltration in such a way that no further damage growth occurs. Such a certification method requires models for determining the residual strength and delamination growth, which are a central prerequisite for the use of this re-infiltration repair for load-bearing CFRP components in civil aviation.

Kontakt: Aurelio Jose Olivares Ferrer

Nzeke Zedom, Arold (M.Sc.)

Betreuender Professor:  Prof. Dr.-Ing. Dipl.-Kfm. Markus Linke

Name der Universität : Universitat Politècnica de València

Forschungsprojekt: Fast and reliable design of adhesively bonded  repairs of carbon fiber reinforced plastic components for primary structures in civil aviation.

Publikationen: Liste der Veröffentlichungen (Link noch nicht hinterlegt)

Previous methods for repairing carbon fibre reinforced plastics (CFRP) result in the cutting of fibres, and hence the introduction of stress concentrations, both of which reduce structural integrity. Adhesive bonding is a lightweight joining method and offers several advantages over bolted/riveted joints (corrosion-free, weight-saving, provides a smooth surface, etc). Aircraft have to fly, they cost money on the ground (handling, maintenance, etc.). Long ground times must be reduced as much as possible. A fast and reliable design for the repair of CFRP components reduces the economic losses caused by long ground times when operating a civil aircraft.

The current dimensioning approach is typically based on the assumption of a complete loss of the load-bearing capacity of the bonded joint and there is still a lack of reliable failure criteria that are relevant for the wider application of bonded joints in primary civil aircraft structures. Accurately predicting the strength of bonded joints is important to reduce the number of costly tests in the design phase.

The aim of this Ph.D. project is to develop a fast and reliable design methodology for bonded repairs on CFRP for primary civil aircraft structures by using an efficient finite element technology to reduce the calculation time. Patches are usually used for CFRP repairs. Different adhesive joints such as single lap, scarf or stepped lap joint are to be considered as a suitable repair concept for the design of adhesive joints. Therefore, the aim of the project is to show that the finite-element method (FEM) can be used to quickly design models that can reliably predict the strength in CFRP bonded joints.

Kontakt: Arold Nzeke Zedom

Rose, Philip Frederic (M.Sc.)

Betreuender Professor:   Prof. Dr.-Ing. Dipl.-Kfm. Markus Linke

Name der Universität :  Universitat Politècnica de València

Forschungsprojekt:  Experimental and numerical investigation into the fatigue behaviour of Carbon Fiber Reinforced Plastics components in adhesively bonded joints

Adhesive bonding has enormous lightweight potential, especially for carbon fibre reinforced plastics (CFRP) in aircraft design. However, this potential cannot yet be fully exploited in CFRP primary structures because the damage tolerance behaviour of bonded joints cannot be validly predicted. Typical damage occurs at the bond line in the form of cohesive as well as adhesive failure, but the joined parts themselves can also experience interlaminar damage (delamination) as well as intralaminar damage (like matrix cracks in individual layers of a laminate). Matrix cracking can trigger progressive damage both at the bond line as well as in the adherends. For a valid prediction of the fatigue behaviour of such bonded joints, the idealisation of damage initiation as well as damage growth and their interactions with other individual damage forms is consequently of central importance. The aim of this PhD project is therefore, on the one hand, the experimental characterisation of the interaction between delamination and matrix cracks under fatigue loading, both with and without the presence of an adhesive layer. On the other hand, models for finite element simulations are to be developed that can represent the formation of matrix cracks and their interaction with delamination.

Kontakt: Philip Frederic Rose

Sadra, Daniel (M.Sc.)

Betreuender Professor:   Prof. Dr.-Ing. habil. Thomas Kletschkowski

Name der Universität :  University of the West of Scotland, Campus Paisley

Forschungsprojekt:  Optimal interior sound management for public and individual transportation systems

Publikationen:    Liste der Veröffentlichungen

This PhD thesis deals with the research on how rooms have to be acoustically designed and excited, to guarantee an optimal perception of sound in the mid and high frequency range. This requires a sound management strategy. Up to now, sound management in not a major design criterion and is only benchmarked by performing test using prototypes of interiors and cabins. Numerical simulations can be used to support the design process. However, this requires a certain design freeze of the prototype. For this reason, the implementation of numerical models into the design process is small and accepted validation processes are still not established. Sufficient modelling of room acoustical problems involves a number of parameters (e.g. material-based absorption coefficients) which are currently not easy to implement. Therefore, the coupling to optimization problems is still not a simple approach. Furthermore, it is difficult to handle the computational costs, if optimization requires a variation of all input quantities (acoustic parameter, room geometry, time discretization, etc.)

Kontakt: Daniel Sadra

Schutzeichel, Maximilian (M.Sc.)

Betreuender Professor:   Prof. Dr.-Ing. habil. Thomas Kletschkowski

Name der Universität :  Otto-von-Guericke Universität Magdeburg

Forschungsthema: Electro-mechanically coupled multi scale models for the simulation of multifunctional lightweight structures made from polymer coated carbon fibres

Publikation: Liste der Veröffentlichungen

Multifunctional structures gained recent interest in the area of composite structures research, e.g. for structural batteries. In this original area, the material compound of polymer electrolyte coated carbon fibres (PECCF) is applied as an electrode in structural energy storages.
This project aims at the simulation and experimental validation of the behaviour of composite structures, which include PECCF and polymer matrix systems. Therefore, the composite is stressed in a multiphysical domain by means of mechanical stresses, electrical fields and electro-thermo-mechanical couplings. An increased understanding of the material behaviour leads to new applications beyond of structural energy storage, e.g. de-icing in aircraft leading edges or, alternatively, as energy/signal transmitting structural part. This technology is beneficial to gain weight saving in lightweight design systems, by combining structural and electrical functions with less material and installation effort.

Kontakt:       Maximlian Schutzeichel                                            Seite von Maximilian Schutzeichel