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Mon, 11 January, 2021
Nokhaiz Sabir Photo, TWI Ltd.
Nokhaiz Sabir Photo, TWI Ltd.

Student Name

Nokhaiz Sabir

Research Title

Characterization and early detection of hydrogen embrittlement in offshore bolts using Acoustic Emission

Keywords

Hydrogen Induced Cracking, Acoustic Emission, Offshore Bolts, Non-destructive Testing (NDT) Techniques

Sponsor

Lloyd’s Register Foundation

Affiliated University

University of Warwick

Supervisors

Dr Ryan Marks, (TWI Ltd), Dr Duncan Billson and Dr David Hutchins (University of Warwick)

Start Date

11 January 2021

Project Outline

The objective of this project will be to develop a methodology for using AE to monitor bolts for hydrogen embrittlement under representative in-service conditions. This will require the PhD candidate to conduct an in-depth review of the literature regarding hydrogen embrittlement and AE studies previously conducted.

 

This will lead on to the design and development of an experimental test program that will aim to establish the parameters and conditions for successfully detecting AE from hydrogen embrittlement. This will include establishing sensors with appropriate sensitivity and frequency response to maximise the probability of detection.

 

This process will acquire a large volume of data that will require the candidate to develop the data handling and processing methodologies in order to achieve successful detection. Data trend analysis, signal processing and data clustering techniques will be employed to differentiate AE from hydrogen embrittlement sources from sources resulting from background noise. The key aim of this will be to establish from the AE the exact point in which the different hydrogen embrittlement mechanisms occur and relate them to theory. This will enable a predictive model to be built which will determine the current condition of a bolt and its remaining useful life.

Publications

 

Thesis

Characterization and early detection of hydrogen embrittlement in offshore bolts using Acoustic Emission