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Energy dissipation due to frictional shake-down on a closed crack subjected to shear

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Abstract

The behaviour of a horizontal crack, subjected to cyclic shear and normal compressive stresses, is investigated with the aim of studying the shake-down and alternating plasticity phenomena. The analysis is carried out by means of the displacement discontinuity numerical method, conveniently modified so as to simulate the development of frictional stresses on the crack surfaces. The assumptions that the crack does not propagate and that the material behaves elastically are made. The critical values of the physical and geometrical parameters which determine the occurrence of frictional shake-down or alternating plasticity are identified. An evaluation of the amount of energy dissipated because of alternating plasticity is also provided.

Sommario

Nel presente articolo viene esaminato il comportamento di una fessura orizzontale soggetta a taglio ciclico e a sforzo normale di compressione. L'analisi è condotta mediante il metodo della Discontinuità di Spostamento, opportunamente modificato in modo da simulare lo sviluppo di sforzi di attrito sulle superfici della fessura. Vengono ricavati i valori critici dei parametri fisici e geometrici che determinano la comparsa del fenomeno dello shake-down. Viene infine valutata la quantità di energia dissipata in ogni ciclo di applicazione del taglio.

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Carpinteri, A., Scavia, C. Energy dissipation due to frictional shake-down on a closed crack subjected to shear. Meccanica 28, 347–352 (1993). https://doi.org/10.1007/BF00987173

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  • DOI: https://doi.org/10.1007/BF00987173

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