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EPFL

École Polytechnique Fédérale de Lausanne
Country: Switzerland
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1,000 Projects, page 1 of 200
  • Funder: EC Project Code: 702233
    Overall Budget: 175,420 EURFunder Contribution: 175,420 EUR

    The use of high-strength steel (HSS) grades leads to significant weight reduction and increased service life, especially in complex-welded structures. However, their implementation is limited in practice due to the fatigue issues at welds, welds which have the same fatigue life as those in lower strength steels. High-frequency mechanical impact (HFMI) treatment allows for important fatigue life improvement based on the induced compressive residual stress (RS), improved weld shape and cold-worked surface region. In current drafted guidelines, these factors were derived according to the weld toe failures obtained under constant amplitude loading (CAL) and also verified by a limited dataset under variable amplitude loading (VAL), the latter being more realistic of service loadings. Current knowledge on HFMI-improved welds has also shown that fatigue failures may also initiate at other regions, rather than weld toe. In spite of the fact that relaxation of induced RS state has been claimed to be the main reason of different damage mechanisms resulting in the failure location change, scientific questions such as: why, how and under what conditions this effect occurs or what damage mechanisms play a dominant role, remain unanswered. Based on the above context, the objective of this proposed project aims to solve the damage mechanisms of HFMI-treated welds under service loading by considering fatigue tests, investigating the microstructures and developing analytical approaches. The proposed scientific approach includes investigations on the development of grain structure size/orientation through the depth of HFMI groove by neutron scattering, and on the relation of grain-orientation-dependent RS state under service loading. This training will also allow transferring of the obtained knowledge obtained to the industrial partner for the implementation of this novel treatment technique by utilizing HSS in the shipyard.

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  • Funder: EC Project Code: 302127
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  • Funder: EC Project Code: 327384
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  • Funder: EC Project Code: 297918
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  • Funder: EC Project Code: 899775
    Funder Contribution: 150,000 EUR

    EXCITE aims to deliver a key, scalable, industrial manufacturing process that will enable the production of excitonic devices for a wide range of applications. Our innovation can create a new market represented by excitonic devices using 2D materials as energy-efficient interconnects. The demonstration of room-temperature control could open the way to industrial applications of the excitonic device concept, with an excitonic switch and optical modulator being the first types of devices that could be implemented.

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