Abstract
It is vitally important to measure the brittle crack arrest properties of shipbuilding steels to ensure that accidental damage will not result in total structural failure. Wide-plate test methods allow for direct measurement of the crack arrest toughness but this kind of testing is incredibly expensive. Therefore, there is a need for cheaper and simpler test methods which are able to measure a material's brittle crack arrest toughness. In this work, Compact Crack Arrest (CCA) testing, which is standardised in ASTM E1221, has been successfully used to measure the crack arrest toughness of thick sections of EH47 shipbuilding steel. The results from this study have been compared to small-scale test methods. It was found that instrumented Charpy testing gives an overprediction of the CCA results, and nil-ductility transition temperature (NDTT) from Pellini tests gives a conservative estimate. The results presented in this study are discussed in terms of the effectiveness of the CCA test method for measurement of brittle crack arrest toughness and integrity assessment of large-scale structures.
| Original language | English |
|---|---|
| Article number | 103004 |
| Number of pages | 9 |
| Journal | Theoretical and Applied Fracture Mechanics |
| Volume | 114 |
| Early online date | 30 Apr 2021 |
| DOIs | |
| Publication status | Published - 31 Aug 2021 |
Funding
The authors would like to thank Lloyd's Register who kindly provided the EH47 shipbuilding steel used in this work and to Weihong He who arranged this. Thanks to TWI Ltd for provision of labs and technician support for the welding, mechanical testing and metallurgical investigation. This work was supported by Industrial CASE grant EP/P510464/1 (reference 2002942) and grant EP/L016303/1 for Cranfield, Oxford and Strathclyde Universities, Centre for Doctoral Training in Renewable Energy Marine Structures - REMS ( http://www.rems-cdt.ac.uk/ ), both from the UK Engineering and Physical Sciences Research Council (EPSRC). This publication was made possible by the sponsorship and support of Lloyd's Register Foundation. The work was enabled through, and undertaken at, the National Structural Integrity Research Centre (NSIRC), a postgraduate engineering facility for industry-led research into structural integrity established and managed by TWI through a network of both national and international Universities. Lloyd’s Register Foundation helps to protect life and property by supporting engineering-related education, public engagement and the application of research. The authors would like to thank Lloyd's Register who kindly provided the EH47 shipbuilding steel used in this work and to Weihong He who arranged this. Thanks to TWI Ltd for provision of labs and technician support for the welding, mechanical testing and metallurgical investigation. This work was supported by Industrial CASE grant EP/P510464/1 (reference 2002942) and grant EP/L016303/1 for Cranfield, Oxford and Strathclyde Universities, Centre for Doctoral Training in Renewable Energy Marine Structures - REMS ( http://www.rems-cdt.ac.uk/), both from the UK Engineering and Physical Sciences Research Council (EPSRC). This publication was made possible by the sponsorship and support of Lloyd's Register Foundation. The work was enabled through, and undertaken at, the National Structural Integrity Research Centre (NSIRC), a postgraduate engineering facility for industry-led research into structural integrity established and managed by TWI through a network of both national and international Universities. Lloyd's Register Foundation helps to protect life and property by supporting engineering-related education, public engagement and the application of research.
Keywords
- brittle crack arrest
- CCA
- compact crack arrest testing
- shipbuilding steel