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Abstract

One of the worst accidents that can take place in industrial presses is related to the risk of generating cracks in the columns. In order to avoid press columns from being subjected to tensile stress in the loading phase, the columns are sometimes assembled precompressed, so that nominal stress maintains negative values throughout the work cycle. Previous researches have considered cracks propagating under cyclic compressive loads in notched specimens. In these cases, the fatigue cracks are initiated at the notch root due to residual tensile stresses and grew at a progressively decreasing speed before arresting. The subject of the present paper is to give a paradigmatic example of crack initiation and propagation also in a general compressive field.
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Authors and Affiliations

Giorgio Olrni
Alessandro Freddi

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