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Investigation of correlations between images of a fracture surface and material structure

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A specimen modeling welded joints in steam turbine rotor was fractured by a fatigue crack in the section of material P9 (EN12070). Fracture surface was documented by SEM, material microstructure close under it by a light microscope, both in the same magnification 500x. Images covering the range of crack rates from about 2 to 20 μm/cycle were analyzed. Fourier decomposition was used to fi[...]

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