An Evaluation of Size Effect in CTOD-SENB Fracture Toughness Tests. (2015)

• Record Type: Journal Article
• Authors: Palombo, Marco; Sandon, Stefano; De Marco, Marco
• Is Part Of: Procedia engineering. Volume 109(2015)
• Page Start: 55
• Page End: 64
• Publication Date: 2015
• Subjects: CTOD -- J-integral -- thickness -- temperature -- fracture -- toughness -- size effect -- SENB.; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2015.06.207
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: This paper describes the attempt to define a correlation criterion between fracture toughness, expressed in terms of J-integral, J, and crack tip opening displacement, CTOD, and referred to the thickness (B) of a specimen. From a thick component (e.g. B ≥ 150 mm) it is often difficult to take full-size specimens, because of their dimensions, and weight make handling and hence CTOD-testing difficult too; moreover, taking a full size specimens could be not possible because of the shape of the component. Therefore the need to find a correlation criterion between fracture toughness and thickness becomes relevant. A number of CTOD-tests were performed in accordance with BS 7448 part 1 on carbon steel single edge notch bend (SENB) specimens of different size. Through the experimental data a correlation was found that allows to evaluate J and CTOD for specimens with different thickness (higher or lower) than the one characterising tested specimens. The toughness-thickness correlation was verified applying the Weibull statistical weakest link theory adopted by the ASTM standard E1921-13. Furthermore, with the aim to use toughness temperature dependence for adapting testing conditions in reduced thickness specimens, data for specimens tested at different temperatures were compared.