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In this paper the so-called Theory of Critical Distances is reformulated to make it suitable for\udestimating the strength of notched metals subjected to dynamic loading. The TCD takes as its starting point the\udassumption that engineering materials’ strength can accurately be predicted by directly post-processing the\udentire linear-elastic stress field acting on the material in the vicinity of the stress concentrator being assessed. In\udorder to extend the used of the TCD to situations involving dynamic loading, the hypothesis is formed that the\udrequired critical distance (which is treated as a material property) varies as the loading rate increases. The\udaccuracy and reliability of this novel reformulation of the TCD was checked against a number of experimental\udresults generated by testing notched cylindrical bars of Al6063-T5. This validation exercise allowed us to prove\udthat the TCD (applied in the form of the Point, Line, and Area Method) is capable of estimates falling within an\uderror interval of ±20%. This result is very promising especially in light of the fact that such a design method can\udbe used in situations of practical interest without the need for explicitly modelling the non-linear stress vs. strain\uddynamic behaviour of metals

On the use of the Theory of Critical Distances to estimate the dynamic strength of notched 6063-T5 aluminium alloy