Short review: Potential impact of delamination cracks on fracture toughness of structural materials
Journal Title: Frattura ed Integrità Strutturale - Year 2016, Vol 10, Issue 35
Abstract
The current energy policy envisages extended lifetime for the current nuclear power plants (GEN II NPP). This policy imposes a large research effort to understand the ageing of power plant components. In this goal, it is necessary to improve knowledge about safety, reliability and components’ integrity for more than forty years of operation. In Central and Eastern Europe, the majority of NPPs are VVER types, where some of the components are produced from austenitic steel 08Ch18N10T. Irradiated 08Ch18N10T may exhibit brittle behavior, namely delamination cracks are found in some cases on the fracture surface of irradiated 08Ch18N10T with elongated δ-ferrite. Delamination cracks have also been observed on the fracture surface of high-strength steels or aluminum-lithium alloys. This article presents a state-of-the art review to provide a detailed analysis of the influence of delamination cracks on the toughness of metal alloys. In general, the delamination cracks are present in metal alloys having a high texture and microstructure anisotropy. Three types of delamination cracks have been observed and are classified as crack arrester delamination, crack divider delamination and crack splitting delamination. The microscopy characterization, 3D fracture theories and computational studies explaining possible causes and effects of delamination cracks on the mechanical properties of metal alloys are presented.
Authors and Affiliations
X. Arnoult, M. Růžičková, K. Kunzová, A. Materna
Keywords
Related Articles
- EP ID EP148962
- DOI 10.3221/IGF-ESIS.35.57
- Views 63
- Downloads 0
Tests in tension-torsion conditions with descending sections of strain curve construction
The paper is devoted to theoretical and experimental investigation of materials behavior on postcritical deformation stage (strain softening). Tests results, which confirm theoretical justification of specimen conf...
Modified fracture properties of cement composites with nano/micro carbonized bagasse fibers
A novel cost-effective alternative in the form of nano/micro carbonized particles produced from waste bagasse fibers has been explored to modify the mechanical properties and fracture pattern of the resulting ...
Effect of nonlinearity of restrainer and supports on the elasto-plastic seismic response of continuous girder bridge
During an earthquake, the nonlinearity of the bridge structure mainly occurs at the supports, bridge piers and restrainers. When entering nonlinear stage, members of the bridge structure affect the elasto-plastic...
Influence of control parameters on the crack paths in the aluminum alloy 2024 under bending
The paper presents development of crack paths in aluminium alloy 2024. Fatigue tests were carried out for specimens with rectangular cross-section. The specimens were put to bending at controlled energy param...
Tenacità a frattura e resistenza a fatica di acciai bonificati con microstrutture derivanti da tempra incompleta e riflessi sulle norme tecniche di impiego
Componenti meccanici di acciai allo stato bonificato, caratterizzati da microstrutture miste derivanti da condizioni di tempra incompleta, si incontrano frequentemente nella pratica costruttiva, a causa della tendenza ve...