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As a typical configuration in plastic deformations,dislocation arrays possess a large variation of the separation of the partial dislocation pairs in face-centered cubic (fcc) metals.This can be manifested conveniently by an effective stacking fault energy (SFE).The effective SFE of dislocation arrays is described within the elastic theory of dislocations and verified by atomistic simulations.The atomistic modeling results reveal that the general formulae of the effective SFE can give a reasonably satisfactory prediction for all dislocation types,especially for edge dislocation arrays.Furthermore,the predicted variation of the effective SFE is consistent with several previous experiments,in which the measured SFE is not definite,changing with dislocation density.Our approach could provide better understandings of cross-slip and the competition between slip and twinning during plastic deformations in fcc metals.