Nanoindentation à hautes vitesses de déformation

Kassel, Allemagne

Personnes à contacter par le candidat

Benoit Merle,
benoit.merle(at)uni-kassel.de -
Tel.: +49 561 804 3656

TÉLÉCHARGEZ L’OFFRE

This position is your unique chance to participate in a large European project (ERC NanoHighSpeed), which will establish nanoindentation testing as the method of choice for investigating high strain rate effects in materials at the micro/nano-scale.

The project:

Nanoindentation is typically performed at strain rates < ~0.1/s, which precludes it from ballistic applications. Recent years have seen the development of nano-impact testing, which produces much higher deformation rates. However, data from such experiments are challenging to interpret, because the high strain rates are not sustained throughout the experiment.

Constant strain rate nanoindentation yields more meaningful data, albeit at the expense of the deformation velocity. The current limitation derives primarily from the plasticity error related to the continuous stiffness measurements (CSM). Our lab explored ways to push this limit by rewriting the standard Oliver-Pharr evaluation method, so as to avoid the need for a measurement of the contact stiffness, e.g. by CSM. With this improvement, the experimental upper strain rate limit is mostly determined by the time constants of the hardware components. The ERC NanoHighSpeed project is about pushing the envelope further and using nanoindentation to explore the nanoscale deformation mechanisms at large strain rates – similar to a collision.

Your role:

As a PhD student in our group, your main tasks will include:
– Collaborative work within the NanoHighSpeed project on high strain-rate deformation of materials
– Development and application of new nanoindentation testing methods
– Characterization of the deformation and fracture behavior of materials at the micro/nano-scale
– Publication of results and reporting, presentations at seminars and conferences
– Collaboration with our scientific partners
– Participation in the common activities of the research group

The group:

The Mechanical Behavior of Materials lab is a young and fast-expanding research group headed by Benoit Merle. It is focused on the nanomechanical characterization of materials. Over the past few years, Dr. Merle and his collaborators have made seminal contributions to the development of novel nano-scale testing techniques. Such new experimental methods are pivotal to identify the elementary mechanisms that govern the mechanical behavior of complex modern materials.

More information at https://uni-kassel.de/go/mbm