Duration: Sept 2014 to Sept 2018


  • Researcher: Ming Li (PhD student)
  • Supervisors: Prof. Sean. Leen, Prof. Padraic ,O'Donoghue
  • Academic Collaborator(s): Prof. Noel O’Dowd, Director MSSI, University of Limerick; Prof. Dongfeng Li, Harbin Institute of Technology of Shenzhen Graduate School, Shenzhen, China; Dr. Richard Barrett, Dr. Noel Harrison
  • Technical Team: Mr Bonaventure Kennedy, Mr Pat Kelly
  • Industrial partners: ESB Energy International
  • Funding source: College of Engineering and Informatics scholarship


The overall aim of this research is to develop modelling constitutive behaviour of P91 weldments and understand the role of hierarchical microstructures of martensitic steel. Meanwhile, investigate fatigue crack initiation (FCI), which incorporates damage mechanics and fatigue indicator parameters into the model to predict FCI. At last, develop an accurate life tool life for relevant component and try to use creep-fatigue modelling to investigate the initiation of type IV cracking.

This project has ESB international as industrial partner and is in collaboration with University of Limerick and Nottingham University. One conference presentations have emanated from this project.


  • Leen.S.B., M.Li, Barrett, R. A , S Scully, D. Joyce, O’Donoghue, P. E., “High Temperature, Multi-material, cyclic plasticity of a P91 welded branch-header connection under cyclic pressure” ASME Pressure Vessels & Piping Conference, Boston, July 19th to 23rd, 2015.


The schematic diagram of research methodology