NDLI: Semi-Large Scale Experiments Performed on Specimens With Underclad Cracks

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Pistora, Vladislav Brumovsky, Milan
Copyright Year	2008
Abstract	During years 2005–2006, a series of semi-large scale experiments on specimens containing underclad (embedded) crack were performed in NRI Rez. The experiments were performed within EU PHARE project EUROPAID/116529/D/SV/CZ, in cooperation with VTT, FNS, TVONS (Finland) and Tecnatom (Spain). The aim of the project was to investigate fracture mechanics properties of cladding, in particular, to establish the role of cladding in the fracture/failure process of the specimen, and based on obtained results to improve the current procedure for evaluation of integrity of WWER reactor pressure vessels. The specimens were manufactured from artificially aged material of decommissioned (not operated) reactor pressure vessel of WWER 440 Type NPP. Each of the specimens contained through-thickness crack embedded in the base material (with approx. 3 mm ligament separating the upper crack front from cladding), and was loaded by four-point-bending loading at room temperature. During loading, majority of specimens exhibited pop-ins followed by ductile tearing of cladding and final failure; only 3 specimens fractured through suddenly, without preceding pop-ins. Evaluation of the experiments concentrated on both process of cleavage fracture in base material and process of ductile tearing in cladding. In the presented paper, the results of experiments are in detail described, including photos from the experiments and photos taken with using high-speed video camera during some of experiments.
Sponsorship	Pressure Vessels and Piping
Starting Page	311
Ending Page	321
Page Count	11
File Format	PDF
ISBN	9780791848265
DOI	10.1115/PVP2008-61474
e-ISBN	0791838285
Volume Number	Volume 3: Design and Analysis
Conference Proceedings	ASME 2008 Pressure Vessels and Piping Conference
Language	English
Publisher Date	2008-07-27
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Temperature Reactor vessels Fracture mechanics Video cameras Fracture (materials) Nuclear power stations Cladding systems (building) Failure
Content Type	Text
Resource Type	Article

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