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SUMMARY:Microstructure sensitive strain-based modelling of fatigue life fo
 r high-performing steel structures
DTSTART:20190927T121500
DTEND:20190927T130000
DTSTAMP:20260406T144427Z
UID:a2337c5d8278405f903d885c066ba06afccca40e2a3029eb83c3b288
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Heikki Remes\, Aalto University\, School of Engineering
 \, Finland\nAbstract:\nA smooth weld geometry and only small imperfections
  are achievable using advanced manufacturing methods. And when crack-like 
 imperfections are eliminated\, increased fatigue life is expected because 
 of the longer macro-crack initiation period. The modelling of this period 
 is a challenge for the fatigue assessment of high-performing structures si
 nce conventional approaches only consider total fatigue life without disti
 nction between crack initiation and propagation periods. To overcome this 
 challenge\, this presentation introduces a new microstructure sensitive st
 rain-based fatigue life model. The model uses a cumulative fatigue damage 
 model for the representative volume element (RVE)\, the size of which is d
 efined from grain size statistics. In this way\, the approach can model an
  arbitrary geometry shape and include the effect of material microstructur
 e. By repeating the fatigue damage calculations for successive RVE steps\,
  the model is also capable of modelling the fatigue damage process from th
 e initial geometry up to the final fracture. Thus\, the fatigue crack init
 iation\, short crack growth and long propagation behavior are all consider
 ed as a continuous process in the same model. The introduced model is appl
 ied to various weld shapes\, and the results are compared with experiments
  and existing local approaches.\n\nBio:\nHeikki Remes graduated as Doctor 
 of Science in 2008 from Helsinki University of Technology. Since 2014\, he
  works as a Professor in Marine Technology at Aalto University\, School of
  Engineering. He has special expertise in theoretical modelling and experi
 mental testing of high-performing steel and marine structures. His researc
 h focus is on light and efficient structures that utilize high strength ma
 terials and modern manufacturing technology for challenging marine environ
 ment. He has been involved in several national and international research 
 projects that aim for fundamental understanding of fatigue and fracture\, 
 as well as tackling practical challenges in the analysis production of hig
 h-performing structures. His research covers characterization and analysis
  methods for complex structures from crystal behavior to continuum modelli
 ng. He has published approximately 100 scientific journal and conference p
 apers. He is a member in International Ship and Offshore Structures Congre
 ss (ISSC) and International Institute of Welding (IIW).
LOCATION:GC B3 31 https://plan.epfl.ch/?room==GC%20B3%2031
STATUS:CONFIRMED
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