Remote reactor repair: GTA (gas tungsten Arc) weld cracking caused by entrapped heliumĪ repair patch was welded to the wall of a nuclear reactor tank using remotely controlled thirty-foot long robot arms. Weld magnification factors derived assuming linear elastic conditions can be applied to EPFM characterization.« less The effect of material modeling can be assessed using a simplified structural model.
Material modeling is less important than geometric modeling in analysis of very shallow cracks but is more important for relatively deeper cracks, e.g.
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It was found that the weld-notch effect reduces and the effect of material modeling increases as crack depth increases. Effects of weld-notch geometry and ductile material modeling on prediction of fracture mechanicsmore » characterizing parameter were assessed. Tension and bending loads applied were monotonically increased to a level causing relatively large scale yielding at the crack tip. The elastic-plastic analysis, assuming power-law hardening relationship and Mises yield criterion, was based on incremental plasticity theory. Crack depth ranging from 2 to 40% of plate thickness were considered. Two limiting crack configurations, plane strain edge crack and semi-circular surface crack in fillet welded T-butt plate joint, were analyzed using the finite element method. This paper describes an elastic-plastic fracture mechanics (EPFM) study of shallow weld-toe cracks. An elastic-plastic fracture mechanics analysis of weld-toe surface cracks in fillet welded T-butt joint
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