Initial Fatigue Crack Growth Behavior in a Notched Component (Report I) : Estimation of Elasto-plastic Stress Distribution in a Notch Field(Mechanics, Strength & Structural Design)

概要

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In order to evaluate J-integral by elastic analysis for the short cracks or initial defects existing in the elasto-plastic field of notches, it is needed to obtain elasto-plastic stress distribution in the notch field, when crack is not present, by elastic solutions. In the present study, strain energy density was taken as the intermediary quantity which connect elastic and elastoplastic states. The estimating formulars on the intermediary quantity were derived by combining the extension of Neuber's rule and elasto-plastic FEM. The distributions of elasto-plastic stresses were calculated from the strain energy density. By taking strain energy density as the intermediary quantity, it was possible to consider stress redistribution by local yielding, and to consider multiaxial stress state in the notch field. As the result, equivalent and principal stresses in the elasto-plastic field of notches could be estimated by only elastic solution and material constants.
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