Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "swepub ;lar1:(mah);spr:eng;pers:(Varias A G)"

Sökning: swepub > Malmö högskola > Engelska > Varias A G

  • Resultat 1-2 av 2
Sortera/gruppera träfflistan
  • Varias, A.G., et al. (författare)
  • Simulation of hydrogen embrittlement in zirconium alloys under stress and temperature gradients
  • 2000
  • Ingår i: Journal of Nuclear Materials. - Elsevier BV North-Holland. - 0022-3115 .- 1873-4820. ; 279:2-3
  • Tidskriftsartikel (refereegranskat)abstract
    • A finite element model is presented for hydrogen embrittlement of zirconium alloys. The model takes into account the coupled processes of hydrogen diffusion, non-mechanical energy flow, hydride precipitation, hydride/solid solution deformation and fracture.The model has been tested successfully against the Sawatzky experiment and exact analytical solutions on hydrogen diffusion and hydride precipitation under a temperature gradient. Based on this model, the hydrogen embrittlement of a Zircaloy-2 cracked plate, is studied under tensile stress and temperature gradient. The initial and boundary conditions are according to those encountered in the fuel cladding of light water reactors during operation. The strong effect of crack tip stress intensification on hydrogen diffusion and initial hydride precipitation is shown. The problem is also studied by considering near-tip material damage which affects hydride precipitation significantly.
  • Varias, A.G., et al. (författare)
  • Temperature and constraint effects on hydride fracture in zirconium alloys
  • 2000
  • Ingår i: Engineering Fracture Mechanics. - Pergamon. - 0013-7944 .- 1873-7315. ; 65:1
  • Tidskriftsartikel (refereegranskat)abstract
    • The fracture of hydrides in zirconium alloys is under consideration. According to the present boundary value problem, a hydride platelet lies ahead of a semi-infinite crack, along the crack plane. The surrounding material is elastic-plastic zirconium alloy. The platelet is either continuous or split into two parts, connected by a ductile matrix ligament. At distances from the crack tip, which are large compared to the hydride and the plastic zone size, the K-T field is applied and mode I, plane strain and contained yielding conditions prevail. Hydride platelet failure initiation and growth is simulated by using a de-cohesion crack growth model and the stress intensity factor, which causes fracture, is estimated at various temperatures as well as under various constraint conditions. Comparison of the calculated temperature effect on toughness with the experimental one is satisfactory. Fracture toughness decreases with T-stress. This effect is attributed to the interaction of the K-T field with hydride expansion, during precipitation. The reduction becomes more important at elevated temperatures and moderates the benefits on fracture toughness, caused by temperature increase. In addition to the detailed finite element results, analytical estimates on fracture toughness are presented, based on a cohesive zone model
Skapa referenser, mejla, bekava och länka
  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Massih, Ali R. (2)
Luleå tekniska universitet (2)
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy