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Using DIC techniques to measure strain ranges inside the cyclic plastic zone ahead of a fatigue crack tip

Giancarlo luis Gómez Gonzáles, Julián Andrés Ortiz González, Jaime Tupiassú Pinho de Castro, José Luiz de França Freire

A stereo microscope coupled to a 3-D Digital Image Correlation system is used to measure strain ranges on the cyclic plastic zone ahead of a fatigue crack-tip. First, a very refined speckle pattern is applied on the surface of a…