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IMMC

Wei Ren
PhD student
China University of Petroleum-Beijing in 2017
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Main project: Contribution to radiation damage modeling of reactor pressure vessel materials in the ductile upper shelf regime (From Charpy impact upper shelf energy to crack resistance curve)
Funding: SCK.CEN
Supervisor(s): Thomas Pardoen

The objective of the this work is to collect all available data that were produced in the last decade including both tensile and Charpy impact as well as crack resistance curves to provide a physically-guided engineering model that can be used as a trend curve for RPV materials. The ultimate goal is to be able to predict initiation fracture toughness and tearing resistance of RPV steels based on the material variables (Cu, Ni, P, ...) and irradiation variables (irradiation temperature, neutron flux and fluence).

This subject combines an experimental part aiming to collect and classify all available data on irradiation effects on the RPV materials properties with an analytical part consisting in physical understanding of the underlying mechanisms of both radiation damage and ductile fracture. It is of prime importance to understand how irradiation modifies the microstructure (nano-size irradiation defects) and this translates into the changes of the crack resistance properties. The phenomenology of the radiation damage model that should be developed can rely on the same concepts used for the DBTT.

The outcome of this work is the development of an improved radiation damage tool that can be very helpful in assessing the fracture properties of vessel materials at high temperatures.



IMMC main research direction(s):
Computational science
Processing and characterisation of materials
Solid mechanics

Keywords:
finite elements
fracture mechanics
micromechanics
plasticity

Research group(s): IMAP
Collaborations: Ludovic Noels - University of Liege/Rachid Chaouadi - SCK.CEN