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Jessica Taylor

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Wed, 08 January, 2020

Student Name

Jessica Taylor

Research Title

Using small scale mechanical tests to predict the crack arrest properties of modern structural steels

Keywords

Brittle crack arrest, steel, fracture mechanics, shipbuilding, compact crack arrest test

Sponsor

Lloyd's Register Foundation

Affiliated University

Cranfield University

Supervisors

Dr Rob Kulka and Dr Philippa Moore (TWI Ltd.), Dr Ali Mehmanparast and Mr Hossein Farrahi (Cranfield University)

Start Date

October 2016

Project Outline

The ability of a material to arrest a fast-running brittle crack is vital for structures where cracks can initiate in regions of high local stress or low toughness. This is essential in industries such as oil and gas, offshore wind and shipbuilding where a structural failure can cause huge loss of life and replacement of expensive assets.

The results of small-scale testing can be used to predict structural behaviour using a number of empirical relationships. However, as the plates used for many applications increase in toughness and thickness, these empirical relationships begin to exceed their limits of validation, and the crack arrest behaviour may not be fully understood.

This project looks at developing test procedures in order for appropriate certification of materials and vessels to be possible. Additionally current test procedures need to be optimized for this purpose, to ensure compliance with one another and more confidence in results.

Publications

Correlation Between Steel Microstructural Characteristics and the Initiation and Arrest Toughness Determined From Small-Scale Mechanical Testing

ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering

Correlation between steel initiation toughness and arrest toughness determined from small-scale mechanical testing

ICSI 2019 The 3rd International Conference on Structural Integrity