Experimental Analysis of Local and Average Dynamic Longitudinal Engineering Compressive Strains in Ductile Porous Rod After the Taylor Direct Impact Experiment
Journal Title: Problemy Mechatroniki. Uzbrojenie, lotnictwo, inżynieria bezpieczeństwa - Year 2015, Vol 6, Issue 4
Abstract
The recent experimental method for determining dynamic longitudinal engineering compressive local strain, [i]ε[/i][sub]l[/sub] ([i]x[/i]), ([i]x[/i] is Lagrangian coordinate) and average one, [i]ε[/i][sub]a[/sub], in a ductile porous rod, plastically deformed by Taylor direct impact experiment (Taylor DIE) is presented in this paper. Analysis of strain distribution, [i]ε[/i][sub][i]l[/i][/sub]([i]x[/i]), along axis of the rod was performed by means of this method. There are two essential singularities in this distribution, namely: the first – the maximum compressive strain, [i]ε[/i][sub][i]l[/i] max[/sub], there is in a near of the striking end rod, but it does not locate on the target face; and the second – at high loading (impact velocity), value of the maximum, [i]ε[/i][sub]l max[/sub], decreases together with increasing of initial rod porosity, inversely than at static loading. The values of the strains [i]ε[/i][sub]l[/sub] ([i]x[/i]) and [i]ε[/i][sub]a[/sub] are limited by the impact velocity [i]U[/i]. Influence of the moderate porosity (e.g. for copper – Δ[sub]sa[/sub] < 20%) on values of the [i]ε[/i][sub]l[/sub] ([i]x[/i]) and [i]ε[/i][sub]a[/sub] is in the order of several percent and it may be neglected.
Authors and Affiliations
Edward WŁODARCZYK, Marcin SARZYŃSKI
Keywords
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- EP ID EP77508
- DOI 10.5604/20815891.1185937
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