The purpose of this project is to assess the damage mechanism of high frequency mechanical impact
treatment of welded joints for lightweight design.
The project was granted in February 2016. I stared to carry out investigations for HiLife in September
2017, where Interdisciplinary collaboration. was held in between institutions, EPFL in Switzerland,
Aalto University and Meyer Turku Shipyard in Finland, The Institut Laue-Langevin- ILL and SONATS
in France, ISIS Neutron and Muon Source in the UK
Funding: 180.000 EuroDescription
01/01-2017 → 31/12-2019
The purpose of this project was to assess the damage mechanism of high frequency mechanical
impact treatment of welded joints for lightweight design.
The project was granted after I started to work at Chalmers in February 2016. I have declined the
grant due to the new working place since the Academy of Finland funds only Finnish Institutions
for this type of grant. The project host was Aalto University in Finland and included cooperation
with EPFL in Switzerland, The Institut Laue-Langevin- ILL and SONATS in France, and Meyer Turku
Shipyard in Finland.
Funding, 300,000 EuroDescription
01/01-2016 → 31/12-2019
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
Funding 94.000 EuroDescription
01/01-2014 → 31/12-2016
Halid Can Yildirim & H. Remes
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
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
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
Halid Can Yildirim & S Ôzüpek
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