OS01W0308 Evaluation of notch tip strains using whole field optical measurement techniques

Abstract

Structural components subjected to notched geometry often show localized yielding upon heavily imposed external loading. Accurate inelastic notch tip strains, required for reliable fatigue design and to prevent catastrophic failure, are frequently calculated by Neuber and Glinka approximations. It is well known that they are extremely efficient, in terms of reduced computational demands, but give poor accuracy because the approaches rely on simple implicit deformation plasticity. In this study, whole field optical measurement techniques, such as reflective moire interferometry and electronic speckle pattern interferometry (ESPI), are applied and compared with the notch-tip strain predictions proposed by Neuber and Glinka. Included are also results obtained by FEM analysis.