Calculated Shoulder to Gauge Ratio of Fatigue Specimens in PWR Environment

Metals

Germán Barrera Moreno¹  Radek Novotny²  Matthias Bruchhausen²  Igor Simonovski²  Alec Mclennan³  Kevin Mottershead³  Peter Gill³  Norman Platts³  Joshua L. Waters³  Sergio Arrieta Gomez⁴  Marc Vankeerberghen⁵ 

[1]Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Avenida Complutense 40, 28040 Madrid, Spain

[2]European Commission, Joint Research Centre, Westerduinweg 3, 1755 ZG Petten, The Netherlands

[3]Jacobs, Walton House 404 Faraday Street, Warrington WA3 6GA, UK

[4]Laboratory of Materials Science and Engineering, University of Cantabria (UNICAN), Avda. de los Castros, s/n. 39005 Santander, Spain

[5]Nuclear Materials Science Institute, Studiecentrum voor Kernenergie, Centre d'Étude de l’Énergie Nucléaire (SCK CEN), Boeretang 200, 2400 Mol, Belgium

关键词: environmental fatigue;    304 stainless steel;    air;    PWR primary water;    300 °C;   

DOI  :  10.3390/met11030376

来源: DOAJ

【 摘 要 】

A ratio of shoulder to gauge displacements (S2G) is calculated for three different fatigue specimens in a pressurized water environment. This ratio needs to be known beforehand to determine the applied shoulder displacements during the experiment that would result in the desired strain amplitude in the gauge section. Significant impact of both the applied constitutive law and specimen geometry on the S2G is observed. The calculation using the fully elastic constitutive law results in the highest S2G values and compares very well with the analytical values. However, this approach disregards the plastic deformation within the specimens that mostly develops in the gauge section. Using the constitutive laws derived from actual fatigue curves captures the material behaviour under cyclic loading better and results in lower S2G values compared to the ones obtained with the fully elastic constitutive law. Calculating S2G values using elastic–plastic constitutive law based on the monotonic uniaxial tensile test should be avoided as they are significantly lower compared to the ones computed with elastic–plastic laws derived from hysteresis loops at half-life.

【 授权许可】

Unknown