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SAMC
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• ANNUAL REPORT 2013
Høyland regularly visits other partner institutions as a
guest researcher. In 2013 he was hosted by University
College London (UCL) for a month. During his stay, he
hosted a workshop on Ice Rubble in collaboration with
UCL. SAMCoT researchers from the Material Modelling
work package (WP2) belonging to UNIS, UCL, Aalto, VTT
and NTNU attended the event, among them Kolari.
ice and SAMCoT
Kolari was first seduced by the topic of ice actions during
his stay at the lighthouse of Norströmsgrund in 1999.
“Just a meter below my feet I could see the ice breaking
against the lighthouse. I was able to hear and feel its
power,” he said.
Since then, Kolari has been fascinated by the brittle
failure (breaking/deformation process) of ice during
ice-structure interaction. He looks into how the ice
breaks or deforms when it interacts with different kind
of structures and tries to simulate it.
“It has to capture the failure process of ice, fragmenta-
tion and the interaction of the fragments,” he says. “The
big question in the dynamic interaction is to find out
what are the mechanisms that cause the transition from
simultaneous to non-simultaneous failure.”
The difference between simultaneous or non-simu-
ltaneous failure is of special importance, especially
in terms of issues related to Health, Safety and
Environment. Simultaneous failure causes vibrations in
the structure, while in non-simultaneous failure, there
is less vibration, which means there is less risk. Kolari
proposed a brittle failure model in 2007 that has been
widely used since then and modified accordingly to the
findings from several projects.
“I believe that the rate dependent cleavage cracking and
friction are strongly linked to the transition problem.
Therefore I have focused on the modelling of the brittle
compressive failure; it is challenging and interesting,”
he said. SAMCoT understands the need and importance
of further research in this area, because the existing
models are not yet good enough.
For this reason, a key element in the centre’s research
strategy is to support Kolari’s research activities along
with new collaborative efforts on the topic.
“I have been really impressed that SAMCoT has
succeeded to form and support a big ice community. In
addition to the deep knowledge, the thing I value most in
this community is its ambition and spirit,” Kolari says.
“Ambition, good spirit and an encouraging atmosphere
are extremely important. Without the good atmosphere
cooperation does not work.”
Kolari has been a key participant of different meetings and lectures during his stay at NTNU/SAMCoT. Here from left to
right, A. Tsarau, T. Nord, K.V. Høyland, K. Kim, E. Schulson and K. Kolari.
Photo: Anna Pustogvar