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
Related Articles
- EP ID EP77508
- DOI 10.5604/20815891.1185937
- Views 92
- Downloads 0
Dynamic Modelling and Aerodynamic Identification of the 74 mm Modified Mortar Bomb
The subject of the research is constituted by the mortar bomb of the calibre 74 mm. The research was executed upon the available copy of the bomb. What has been examined was the distribution of masses, inertia moments we...
Analiza procesu przebijania płyty przez małogabarytowy element cylindryczny
W artykule przedstawiono wstępną weryfikację oddziaływania małogabarytowego elementu cylindrycznego z przeszkodą w postaci tarczy metalowej o grubości 2,5 mm. Rozważono uderzenia z różnymi prędkościami (200, 400 i 800 m/...
Laboratory Setback Activators and Explosive Suitability for Gun Launch
There is currently no agreed standard methodology for assessing the suitability of explosives for gun launch or for the determination of acceptance criteria for explosive fill defects. Laboratory setback activator testin...
Model of Unmanned Ground Vehicle
The paper deals with utilization of the laser rangefinder for navigation and mapping of unknown indoor environment. The navigation algorithm is based on comparison of two pictures of the unknown space and gain of the cor...
Czasoprzestrzeń w analizie dynamicznej mostów
W pracy zaprezentowano kolejne zastosowania i możliwości analizy dynamicznej obiektów inżynierskich za pomocą czasoprzestrzeni z wykorzystaniem różnic skończonych, w ujęciu numerycznym zaproponowanym przez autora. Obiekt...