Use of Circumferentially Cracked Bar sample for CTOD fracture toughness determination in the upper shelf regime
Journal Title: Frattura ed Integrità Strutturale - Year 2014, Vol 8, Issue 30
Abstract
In this work, the use of circumferentially cracked bar (CCB) sample to determine material fracture toughness in the upper shelf regime for carbon steels has been investigated. Since high fracture toughness materials are known to exhibit extensive crack tip blunting before ductile crack initiation, accurate specimen design is required to provide realistic fracture toughness measurement. Here, a CCB was designed to have similar loss of constraint as for SENT sample. Continuum damage mechanics was used to predict the occurrence of ductile crack initiation and propagation. Finite element analysis was performed to predict specimen response and to compare computed J-integral crack driving force with measured CTOD. Finally, experimental tests were performed on X65 carbon steel and the measured critical CTOD was compared with available fracture data obtained with SENT.
Authors and Affiliations
D. Gentile, I. Persechino, N. Bonora, G. Iannitti, A. Carlucci
Keywords
Related Articles
- EP ID EP100024
- DOI -
- Views 75
- Downloads 0
Initiation and growth behavior of very-long microstructurally short fatigue cracks
The present paper describes a novel experimental technique recently presented that allows one to study interactions between the crack and microstructural barriers with an unprecedented level of ease and detail. The...
Measurement and analysis of fatigue crack deformation on the macro- and micro-scale
The paper describes an experiment which performs in-situ loading of a small compact tension specimen in a scanning electron microscope. Images are collected throughout a number of successive loadincg cycles...
Competition between microstructure and defect in multiaxial high cycle fatigue
This study aims at providing a better understanding of the effects of both microstructure and defect on the high cycle fatigue behavior of metallic alloys using finite element simulations of polycrystalline aggre...
Integrated assessment procedure for determining the fracture strength of glass components in CSP systems
The structural integrity and reliability of glass components are key issues for concentrated solar power (CSP) systems. For example, the glass windows in a solar furnace may suffer catastrophic fracture due to th...
Crack path dependence on inhomogeneities of material microstructure
Crack trajectories under different loading conditions and material microstructural features play an important role when the conditions of crack initiation and crack growth under fatigue loading have to be evaluated...