Colloquium # 301
Mechanical Properties of OFE Copper Subjected to Electron Irradiation
By Prof. B.K.DUTTA
Institute Chair Professor, Homi Bhabha National Institute
Wednesday, Feb 5th 2020 at 3:30 PM
The mechanical and fracture properties of aged materials degrade due to metallurgical and micro- structural changes under various service conditions. Miniaturized specimen testing methodology has been evolved over the years to study such degradation mechanisms. Oxygen Free Electronic (OFE) copper has wide applications in nuclear industry. Such material when subjected to irradiation during service is affected by the degradation of ductility and fracture toughness. In the present study, linear accelerator is used to irradiate OFE Copper at different radiation dose. The change in yield stress and fracture properties of irradiated specimens is then investigated by using small punch tests (SPT). Various specimens are subjected to electron irradiation dose varying from 11 MGy to 91.5 MGy. The load-displacement curves thus obtained are used to calculate changes in yield stress, biaxial fracture strain and fracture initiation toughness using existing correlations from literature. It has been observed that there is a significant rise in yield stress and a sharp drop in the fracture toughness values beyond 62.5 MGy electron dose. This aspect should be taken into consideration during the design for calculating service life of the components made up of OFE Copper subjected to electron irradiation.
About the speaker
B.E (Hons)., Mechanical Engineering, 1976, NIT (erstwhile Govt. Engg Collage), Raipur
M.Tech., Mechanical Engineering, 1983, Indian Institute of Technology, Kanpur
Ph.D., Mechanical Engineering, 1990, Indian Institute of Technology, Bombay
Present Research Interests:
Safety Analysis of Nuclear Structures; Fracture and Damage Mechanics; Multi Scale Material Modelling; Miniaturized Specimen Testing
Prof. B.K.Dutta contributed significantly in basic and applied research in structural safety, particularly in the area of fracture and damage mechanics. The five categories of research work profile are: Development of new finite elements and FE based computer codes; Solutions of complex reactor problems; Setting up of Miniaturized Specimen Test Facility; Accomplishment of five-year plan projects and Research collaborations with national and international agencies. He has partaken in academic administration including human resource development program of the department and chaired many national and international conferences. He is a founder member of Homi Bhabha National Institute and has served the institute in several capacities. He has guided eight PhD students, fifteen M.Tech. students and is presently associated with the PhD programs of six students. He is the author of 300+ publications, which include 125+ peer reviewed journal papers.
Awards and Recognitions:
Recipient of Technical Excellence Award (DAE), Homi Bhabha Science & Technology Award (DAE) and Distinguished Faculty Award (HBNI). Former President of International Association for Structural Mechanics of Reactor Technology (USA). Fellow of Indian National Academy of Engineering.