Imaging Elasticity of Advanced Engineering Materials

Projektbeschreibung

Kräfte erkennen, ohne zu beschädigen

Das Wissen um die Elastizität eines Materials (steif oder flexibel) ist von entscheidender Bedeutung – für die Konstruktion von Flugzeugen bis hin zu Knochenimplantaten. Die derzeitigen Methoden zur Messung der Elastizität beschädigen jedoch oft das Material oder erfassen nicht das gesamte Bild. Das über die Marie-Skłodowska-Curie-Maßnahmen unterstützte Projekt ImagingElasticity entwickelt eine zerstörungsfreie Methode, um die Elastizität der Materialoberfläche abzubilden und zu zeigen, wie sich die Eigenschaften durch unterschiedliche Verarbeitung oder Auslegung verändern. Dieser Durchbruch wird die Herstellung fortschrittlicher Werkstoffe, einschließlich Implantat-Titanlegierungen der nächsten Generation, beschleunigen. Durch eine innovative Kombination aus laserakustischer Bildgebung und einem neuartigen Wellenausbreitungs-Algorithmus verspricht das Projekt nicht nur schneller verfügbare Erkenntnisse, sondern auch die Entwicklung besserer und langlebigerer biomedizinischer Geräte. Für die Wissenschaft, die Industrie und die Patientenversorgung wird dies Vorteile bringen.

Ziel

ImagingElasticity is a project to develop, for the first time, a system to measure and image the elasticity of materials non-destructively. Determining elasticity of new material, typically a sample of a novel alloy or one innovatively fabricated, is crucial to understand its mechanical properties. Measuring local elasticity over a large area – imaging elasticity – is an important step forward, allowing to characterize its spatial distribution resulting from specialized treatments (typically heterogeneous thermal or mechanical processing) or specifically designed fabrication (e.g. additive manufacturing). The elasticity imaging will also provide a high-throughput characterization method, supporting rapid development of new materials.
Along with the development of the method, we will apply it to the progress of biomedical β-Ti alloys intended for bone implants. To achieve biomechanical compatibility, leading to higher duration of the implant, the implant’s stiffness (i.e. its elasticity) should be very low compared to typical values of metals – but the strength and wear resistance must remain high. There is extensive research to find the right chemical composition and processing, which will be significantly accelerated by the newly developed characterization method.
At the heart of this proposal is the use of a new technique for computing the solutions to the wave-propagation problem which the researcher has co-developed – the Ritz-Rayleigh method. This method will be adapted for the purpose and combined with spatially resolved acoustic spectroscopy (SRAS), a unique laser-ultrasonic method for localized measurement of surface acoustic wave velocity developed by the supervisor and his team. This pairing is ideal for the researcher’s career development (by acquiring new research skills supervised by experts in optics and soft skills at the host-institution courses) and also for the host group, leaving a long-lasting impact of the newly developed method.