Digital Repository, ECF15, Stockolm 2004

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Optimising energy input for fracture by analysis of the energy required to initate dynamaic mode I crack growth
V. Bratov, Y. Petrov

Last modified: 2013-02-08


A problem for a central crack in a plate subjected to plane strain conditions is investigated.Mode I crack loading is created by a dynamic pressure pulse applied at large distance fromthe crack. It was found that for a certain combination of amplitude and duration of the pulseapplied, energy transmitted to the sample has a strongly marked minimum, meaning that withthe pulse amplitude or duration moving away from the optimal values minimum energyrequired for initiation of crack growth increases rapidly. Results received indicate apossibility to optimise energy consumption of different industrial processes connected withfracture. Much could be gained in for example drilling or rock pounding where energy inputaccounts for the largest part of the process cost. Presumably further investigation of the effectobserved can make it possible to predict optimal energy saving parameters, i.e. frequency andamplitude of impacts, for industrial devices, e.g. bores, grinding machines, etc. and hencesignificantly reduce the process cost. The prediction can be given based on the parameters ofthe media fractured (material parameters, prevalent crack length and orientation, etc.).

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