The aim of this project is to study the effectiveness of fatigue strength improvement methods based
on the induced residual stress state and the establishment of smooth weld profile.
I have been performing analyses on HFMI treated welds and TIG dressed welds in order to verify the
expected fatigue strength improvements for a residual stress treatment and a weld profile modification
method, respectively.
Funding 94.000 EuroDescription
01/01-2014 → 31/12-2016
The purpose of this project is to assess the mechanical performance of a lightweight stator structure
for very large diameter permanent magnet synchronous generator.
I did fatigue strength analyses of a full-scale stator model by considering advanced joining technologies,
e.g. post-weld treatment, in order to present a concept for a novel lightweight internal stator
structure.
Funding: 42.000 EuroDescription
01/01-2013 → 31/12-2014
Halid Can Yildirim & S. Vanrosten-berghe
The aim of the project was to develop methods for improving the performance of welded high-strength
steels (yield strength of 700 and 960 MPa) at thicknesses of 5-20 mm for use in fatigue-loaded welded
structures.
I proposed one approach to fatigue assessment for HFMI-improved joints. I presented a yield strength
correction procedure which relates with the material yield strength and I verified it based on the
constant amplitude R = 0.1 axial fatigue data. I proposed design recommendations by stress analysis
methods based on the nominal stress, the structural hot spots tress and the effective notch stress.
Further I showed that all the proposed design recommendations in this study are conservative with
respect to available fatigue test data.
Funding: 1.800/300.000 EuroDescription
01/01-2010 → 31/12-2013
Halid Can Yildirim & G. Marquis
The goal of the project was to gain a leading international position in the development of a future generation
of advanced materials, structures and systems, with reduced weight, increased performance,
improved energy efficiency and a reduced environmental footprint.
I performed an experimental round robin test procedure on HFMI-improved high strength steel welded
specimens. Experimental test results indicated that all of the HFMI-improved welds from the four
HFMI equipment manufacturers satisfied the previously-proposed characteristic S-N line which is
based on both the material yield strength and the specimen geometry.
Funding 8.080/1.460.000 EuroDescription
01/01-2009 → 31/12-2013
The goal of this project was to develop a procedure for reliable structural analysis and service life
estimation of a solid rocket motor grain.
I did structural stress analyses of a full-scale model of a solid propellant rocket motor under actual
loading histories. An accurate material model of propellant was verified with including material ageing.
Funding 300.000 EuroDescription
01/01-2007 → 31/12-2010
