Mechanics of Hydrogen diffusion and embrittlement

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• Professor Norman Fleck, CUED
• Thursday 14 June 2018, 15:00-16:00
• CUED, LR6.

If you have a question about this talk, please contact Hilde Hambro.

Hydrogen embrittlement results from the diffusion of hydrogen into a metallic alloy, such as pipeline steels, and subsequent embrittlement at various trapping sites, such as grain boundaries. These traps are sites of hydrogen embrittlement, and the degree to which the traps soak up hydrogen depends upon the type of site and the enthalpy of trapping.

A large number of material parameters dictate the diffusion process. A non-dimensional analysis has been performed in order to identify the small number of governing non-dimensional groups and to analyse the two standard tests: hydrogen uptake in the electro-permeation test and hydrogen release in the thermal desorption test. Fracture mechanics for hydrogen embrittlement from short cracks has also been developed but many questions still remain.

This talk is part of the Engineering - Mechanics and Materials Seminar Series series.

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