DETERMINATION OF FRACTURE TOUGHNESS IN THE UPPER SHELF REGION USING SMALL SAMPLE TEST TECHNIQUES

1 KONOPÍK Pavel
Co-authors:
1 DŽUGAN Jan 1 RUND Martin
Institution:
1 COMTES FHT a.s., Průmyslová 955, 334 41 Dobřany, Czech Republic, EU
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
710-715
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
162 views / 32 downloads
Abstract

The residual lifetime assessment and the risk of a possible service components failure are critical issues in the safety and reliability analyses of industrial plants. The residual lifetime can be evaluated by the standard mechanical test techniques, such as the tensile test, uniaxial creep test, the Charpy or the fracture toughness test. Fracture mechanics in particular has attained high significance in establishing ultimate load limitations and assessing the integrity of a large number of engineering structures of multifarious types. Standard mechanical tests used to determine the fracture toughness involve extraction of large blocks of material and therefore are not applicable to in-service components.The development and in-service application of essentially non-destructive, miniature material sample removal systems (e. g. the surface sampling systems, such as Electric Discharge Sampling Equipment - EDSE) provided a practical incentive for development of small specimen test methods to evaluate material properties, e. g. fracture toughness. The EDSE can cut out small slices (‘boat sampling’) about 3 mm thick and approximately 20 mm wide x 25 mm long from thick-section components leaving behind cavities with round edges that usually do not require repair.In this study, two different methods will be used for fracture toughness determination: Small Punch Test and multiple-specimen method using sub-size Charpy specimens (3x4x27 mm). Both methods require very little experimental material and specimens can be made directly from the removed ‘boat sample’ by the EDSE. The applicability and reliability of both methods will be discussed.

Keywords: Small Punch test, facture toughness, Micro-Tensile test, Mini-Charpy test

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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