Turnbull, A (2001) Challenges in characterizing the crack-tip environment as a basis for prediction of crack growth kinetics. In: 10th International Conference on Fracture (ICF 10), 2-6 December 2001, Hawaii.

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Abstract

The challenges in improved mechanistically-based prediction of crack growth kinetics due to hydrogen embrittlement are discussed in relation to the local crack-tip environment, which, in context, embraces crack-tip chemistry and the hydrogen distribution ahead of the tip. Important advances have been made in modelling crack-tip electrochemistry and considerable insight obtained but the need for an electochemical database of input parameters is paramount to ensure confidence in prediction. In modelling the crack-tip hydrogen distribution the use of generalised boundary conditions which link electrochemical processes and hydrogen atom transport in the crack-tip region has been an important advance but must be coupled to more realistic crack-tip stress and strain models. A validated model of this form linked with criteria for crack advance incorporating material property and microstructural parameters is a necessary precursor to meaningful quantitative crack growth prediction.

Item Type:	Conference or Workshop Item (UNSPECIFIED)
Keywords:	environment assisted cracking, crack-tip environment, hydrogen embrittlement, modelling
Subjects:	Advanced Materials
Last Modified:	02 Feb 2018 13:17
URI:	http://eprintspublications.npl.co.uk/id/eprint/2623

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