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Acoustic emission technique to monitor crack growth in a mooring chain

Acoustic emission technique to monitor crack growth in a mooring chain
Acoustic emission technique to monitor crack growth in a mooring chain

Mooring chains are designed for an operational life of 25 years. However, owner/operator data show that a Floating Production Unit (FPU) experiences a mooring line failure every 9 years on average, and periodic inspections are necessary to monitor their integrity. An established condition monitoring technique based on Acoustic Emission (AE) has the potential to be deployed to mooring chains. AE is based on the principle that elastic energy waves are spontaneously released by a material undergoing plastic deformation and crack growth. The purpose of this paper is to present a feasibility study of AE testing to monitor initiation and propagation of stress corrosion cracks in a mooring chain link, in order to establish whether crack initiation and crack extension phases can be detected and discriminated in the course of a static tensile test. The tensile test was carried out in artificial seawater (3% NaCl solution) using a single grade R5 link of diameter 160 mm for 3.7 months where a crack was initiated from a notch. AE features were plotted against time and these plots were extensively discussed with the view of contributing to the closure of a knowledge gap in the experimental literature.

Acoustic emission, Crack growth, Crack initiation, Cumulative energy, Mooring chain
0003-682X
156-164
Rivera, Fernando Galvan
d86ccb19-9140-4ea4-ad35-7617c3f88058
Edwards, Graham
44fb479b-90ca-4b99-802e-570292b28fd3
Eren, Elvin
f96f553f-3dc0-48ff-ba28-2d8cd9ea287b
Soua, Slim
40dbb8b2-4ef7-4f0f-a148-0742bb433781
Rivera, Fernando Galvan
d86ccb19-9140-4ea4-ad35-7617c3f88058
Edwards, Graham
44fb479b-90ca-4b99-802e-570292b28fd3
Eren, Elvin
f96f553f-3dc0-48ff-ba28-2d8cd9ea287b
Soua, Slim
40dbb8b2-4ef7-4f0f-a148-0742bb433781

Rivera, Fernando Galvan, Edwards, Graham, Eren, Elvin and Soua, Slim (2018) Acoustic emission technique to monitor crack growth in a mooring chain. Applied Acoustics, 139, 156-164. (doi:10.1016/j.apacoust.2018.04.034).

Record type: Article

Abstract

Mooring chains are designed for an operational life of 25 years. However, owner/operator data show that a Floating Production Unit (FPU) experiences a mooring line failure every 9 years on average, and periodic inspections are necessary to monitor their integrity. An established condition monitoring technique based on Acoustic Emission (AE) has the potential to be deployed to mooring chains. AE is based on the principle that elastic energy waves are spontaneously released by a material undergoing plastic deformation and crack growth. The purpose of this paper is to present a feasibility study of AE testing to monitor initiation and propagation of stress corrosion cracks in a mooring chain link, in order to establish whether crack initiation and crack extension phases can be detected and discriminated in the course of a static tensile test. The tensile test was carried out in artificial seawater (3% NaCl solution) using a single grade R5 link of diameter 160 mm for 3.7 months where a crack was initiated from a notch. AE features were plotted against time and these plots were extensively discussed with the view of contributing to the closure of a knowledge gap in the experimental literature.

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More information

Accepted/In Press date: 26 April 2018
e-pub ahead of print date: 3 May 2018
Published date: 1 October 2018
Keywords: Acoustic emission, Crack growth, Crack initiation, Cumulative energy, Mooring chain

Identifiers

Local EPrints ID: 422775
URI: http://eprints.soton.ac.uk/id/eprint/422775
ISSN: 0003-682X
PURE UUID: e7909bd9-68c9-4ebf-9ba2-ce0571b0da84

Catalogue record

Date deposited: 03 Aug 2018 16:31
Last modified: 07 Oct 2020 01:03

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Contributors

Author: Fernando Galvan Rivera
Author: Graham Edwards
Author: Elvin Eren
Author: Slim Soua

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