Residual stresses have been introduced into a notched compact tension specimen of a 347 weld material by mechanical compression. The required level of compressive load has previously been determined from finite-element studies. The residual stress in the vicinity of the notch root has been measured using neutron diffraction and the results compared with those obtained from finite-element analysis. The effect of stress redistribution due to creep has been examined and it is found that a significant reduction in stress is measured after at . The implications of these results with regard to the development of damage in the specimen due to creep relaxation are examined.
Issue Section:Materials and Fabrication
Keywords:residual stress, high temperature, creep crack initiation, fracture, compressive strength, cracks, creep, finite element analysis, internal stresses, neutron diffraction, notch strength, welds
Topics:Creep, Stress, Finite element analysis, Damage, Fracture (Materials)
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by American Society of Mechanical Engineers