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Assessing toughness correlation methods for S690 steels based on complete and incomplete CHarpy transition curves

Assessing toughness correlation methods for S690 steels based on complete and incomplete CHarpy transition curves
Assessing toughness correlation methods for S690 steels based on complete and incomplete CHarpy transition curves
Modern structural integrity assessment codes such as BS 7910 and FITNET have been increasingly utilised throughout design, fabrication and operation stages of metallic infrastructure. When defects are present, these codes describe an engineering critical assessment which requires the input of material fracture toughness. The standard fracture toughness test method - crack tip opening displacement (CTOD) test is both time consuming and costly to measure toughness. Instead, it is more common to determine the fracture toughness based on the correlation with Charpy impact toughness test results, which are relatively quick and inexpensive to obtain. However, existing correlation methods are empirically based on the test results in the past from the steel grades at that time and may not represent the modern high strength grades of steel with large thickness. This often leads to overly conservative engineering critical assessment output. To further validate the toughness correlation methods, this paper compares the Charpy energy based toughness estimates with CTOD test results, focusing on high strength steel grade S690 including base metal, welds and heat affected zone, with a thickness ranging from 10 mm to 160 mm. In addition to the method using complete Charpy ductile-to-brittle transition curves, the formulae proposed in the FITNET report and procedure for incomplete datasets are also examined. The outcome of this study provides judgement on the validation and potential conservatism induced by toughness correlation for high strength steels. This also helps with further developing the procedure of converting Charpy impact energy into material fracture toughness in structural integrity assessment codes.
Wang, Y.
2729f2f1-36d7-4daa-8589-b61fcc99a313
Shenoi, R.
a37b4e0a-06f1-425f-966d-71e6fa299960
He, W.
e9304c71-0ee9-49c9-b500-168aa7c55988
Xu, L.
9e8a6ff2-d3ae-4fe4-bd6c-32fca7310714
MacDonald, A.
30799232-7036-4e9c-ae98-48dba0f467ab
Wang, Y.
2729f2f1-36d7-4daa-8589-b61fcc99a313
Shenoi, R.
a37b4e0a-06f1-425f-966d-71e6fa299960
He, W.
e9304c71-0ee9-49c9-b500-168aa7c55988
Xu, L.
9e8a6ff2-d3ae-4fe4-bd6c-32fca7310714
MacDonald, A.
30799232-7036-4e9c-ae98-48dba0f467ab

Wang, Y., Shenoi, R., He, W., Xu, L. and MacDonald, A. (2018) Assessing toughness correlation methods for S690 steels based on complete and incomplete CHarpy transition curves. In 3rd International Conference on Safety and Reliability of Ships, Offshore & Subsea Structures. 10 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Modern structural integrity assessment codes such as BS 7910 and FITNET have been increasingly utilised throughout design, fabrication and operation stages of metallic infrastructure. When defects are present, these codes describe an engineering critical assessment which requires the input of material fracture toughness. The standard fracture toughness test method - crack tip opening displacement (CTOD) test is both time consuming and costly to measure toughness. Instead, it is more common to determine the fracture toughness based on the correlation with Charpy impact toughness test results, which are relatively quick and inexpensive to obtain. However, existing correlation methods are empirically based on the test results in the past from the steel grades at that time and may not represent the modern high strength grades of steel with large thickness. This often leads to overly conservative engineering critical assessment output. To further validate the toughness correlation methods, this paper compares the Charpy energy based toughness estimates with CTOD test results, focusing on high strength steel grade S690 including base metal, welds and heat affected zone, with a thickness ranging from 10 mm to 160 mm. In addition to the method using complete Charpy ductile-to-brittle transition curves, the formulae proposed in the FITNET report and procedure for incomplete datasets are also examined. The outcome of this study provides judgement on the validation and potential conservatism induced by toughness correlation for high strength steels. This also helps with further developing the procedure of converting Charpy impact energy into material fracture toughness in structural integrity assessment codes.

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Published date: May 2018

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Local EPrints ID: 419991
URI: http://eprints.soton.ac.uk/id/eprint/419991
PURE UUID: c9386d90-2efb-4541-87f2-9fb7122352c3
ORCID for Y. Wang: ORCID iD orcid.org/0000-0001-5619-7795

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Date deposited: 25 Apr 2018 16:30
Last modified: 14 Mar 2019 01:34

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