Home > Search Results: "International Conference on STRUCTURAL MECHANICS IN REACTOR TECHNOLOGY /17./."
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National Repository of Grey Literature 3 records found  Search took 0.01 seconds. 
The Weibull Stress Parameters Calibration upon the Toughness Scaling Model between Cracks Having Different Constraint
 Kozák, Vladislav ; Vlček, Libor
An extensive investigation has been carried out on the sensitivity parameters determination describing the fracture behaviour of body with crack with respect to the character change of true stress-strain curve with dominant region of Lueders deformation.Consequently,its convenient substitution has been tested.This paper presents the consideration on the change judgement of J-integral and constraint as the base parameters of two-parameters fracture mechanics.The Weibull stress model for cleavage fracture of cast steel requires calibration of two micromechanics parameters (m,ó u).Weibull stress seems to be a parameter for prediction of cleavage failure of cracked bodies and the study is focused on the assessment of the effects of constraint loss on cleavage fracture toughness (Jc).To quantify the effects of constraint variation on the cleavage fracture toughness the form of the toughness-scaling model based on the Weibull stress ó w is investigated.Local material parameters have been calculated arising from Beremin approach and calibration is based on various approaches.Methods are based on weakest link assumption and incremental fracture probability,which depends not only on the maximum principal stress,but also on the equivalent plastic strain.The fracture resistance has been assessed using data from static tests of there point bend specimens.
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Design Against Brittle of Elastic-Plastic Fracture of Nuclear Waste Container
 Pluvinage, G. ; Lenkey, G. B. ; Dlouhý, Ivo
Design against brittle or elastic plastic fracture of nuclear waste container is discussed based on three different concepts:(i)reserve of ductility defined by means of reference temperature,(ii)deterministic design using linear or elasto-plastic fracture mechanics associated with reserve factors,and (iii)probabilistic design associated with RCC-MR failure assessment diagram. Cast ferritic steel predetermined for containers of spent nuclear fuel has been used in experimental part of the study.Fracture toughness characteristics necessary for considerations have been obtained by standard 1T three point bend specimens tested statically at different temperatures.Pre-cracked Charpy type specimen has been also employed for the investigations tested statically and dynamically.Material properties necessary for the concept presented are corresponding Master Curve and Weibull distribution of fracture toughness.Special attention has been paid to dynamic loading.Large scatter in reserve factor was found depending on the selected failure assessment method for fracture toughness characteristics changing the value from 1.44 to 4.55.
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Evaluation of Strain Rate Effects on Transition Behaviour Applying the Master Curve Methodology
 Dlouhý, Ivo ; Kohout, J. ; Jurášek, Ladislav ; Holzmann, Miloslav
Master curve methodology has been used for an evaluation of strain rate effects on transition behaviour of wrought CrMo and cast ferritic C Mn steel.The physical aspects of strain rate effect on reference temperature has been analysed as a base for the prediction of this dependence.Statistical aspects of the strain rate effects on the master curve have been discussed showing capability of the method for the prediction of strain rate susceptibility of steel fracture behaviour. It has been experimentally proved that the master curve shape does not depend on the loading rate.The relationship between reference temperature T0 (or the shift of T0 with respect to quasi-static loading rate)and loading rate can be described with linear dependence if logarithmic scale of temporal change of stress intensity factor is considered.For experimental establishing of the dependence of reference temperature on loading rates only two T0 values as determined at different loading rates are sufficient.However,it is useful to achieve the comparable accuracy of both T0 determinations that may demand larger number of specimens for the measurement of T0 at the higher loading rate.Standard quasistatic fracture toughness has been predicted from small pre-cracked Charpy type specimens tested dynamically applying the reference temperature shift obtained experimentally.The predicted fracture toughness temperature diagram has been proved experimentally.
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