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Omid joined the Section of Road and Railway Engineering at Delft University of Technology in 2014. He received his bachelor degree in Mechanical Engineering from Sharif University of Technology in 2010. His bachelor thesis topic was “Numerical Simulation for Energy Absorption of Monolithic and Double-Layered Steel Plates under normal and inclined Impact”.  He did his master studies on Computational Mechanics in Technical University of Munich (TUM) and graduated in 2013. His master thesis research title was “Evaluation of Different Modelling Approaches for Process Induced Deformations (PID) due to Tool Part Interaction (TPI) during Composite Processing”. Omid\'s main research interests include Multi-scale Theoretical and Computational Solid Mechanics, Computational Contact and Impact Mechanics and Mechanical Design Optimization.rn 

Omid has research experience on computational solid mechanics both in university (Chair of Lightweight Structures, Chair of Metal Forming and Casting and Chair of Carbon Composites at TUM) and industry (DSM Company in Netherlands). He is currently working on computational steel material modelling at microscale under impact fatiugue load in TU Delft as a part of M2i (Material Innovation Institute) project.rn rn 

Micromechanical modeling of railway steels under impact fatigue present at crossing nose

Frogs or also called common crossings are subjected to severe impact when wheel rolls from the wing rail to the crossings nose or in the opposite direction. This leads to various defects like irregular wear, plastic deformation, squats, lipping, head checks and etc. finally leading to failure of the crossings which causes safety concerns and financial issues due to replacement.

The main steels used to build common crossings rolled pearlitic steels or casted austenitic Mn-steels. Due to constant increase in vehicle speed and axle load ProRail in seeking new materials which are more resistant to damage under such working condition. Apart from operational disruptions in the network, high and unnecessary monitoring and replacement costs result from this situation.

 The focus of this research will be mostly on the development of fundamental insights in the relations between mechanical loading, damage development, and microstructural features of the rail steels. This will be done by developing a computational model of steel microstructure under fatigue damage condition. 

Meso and Micromechanical models of steel using crystal plasticity material models will be created in order to study their mechanical behavior under impact fatigue load which is present at railway crossings. Different steel microstrucures include Hafield austenitic, pearlitic and most importantly bainitic steels.

His research is part of a M2i (Material Innovation Institute) project which uses an interdisciplinary approach with three main disciplines, material science, tribology and numerical modelling and his task is to create the numerical models.

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Omid Hajizad, MSc

PhD Researcher

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