Author:
Rodríguez-Sereno J. M.,Pernas-Sánchez J.,Artero-Guerrero J.A.,López Puente J.
Abstract
In this work it has been characterized the impact behaviour of quasibrittle fragments against a Hopkinson bar in a wide range of impact velocities (70-180 m/s). Hopkinson bar is designed to measure the impact forces thanks to a proper instrumentation. In this case, semiconductor strain gauges, which sensibility is higher than common strain gauges, are used. Two material are studied to widen the range of applicability of the experimental facility: PMMA and a woven composite material. Moreover, two high speed cameras (Photron SA-Z) have been used to obtain the displacement and strain field of the fragment impactor using 3D Digital Image Correlation (DIC). A special technique has been used to print the speckle in the fragment based on previous works. The developed experimental methodology has shown the different failure modes that may happen in the fracture process when the quasibrittle fragments acts as the impactor providing a better understanding of its physical behaviour.
Reference7 articles.
1. Experimental analysis of high velocity impacts of composite fragments
2. Vion Laurence et al., Counter-Rotating Open Rotor (CROR): flow physics and simulation, 20ème Congrès Français de Mécanique, 29 August-2 September 2011, Besançon, France (2011).
3. López-Puente J., Mata-Díaz A., Pernas-Sánchez J., Artero-Guerrero J.A., Varas D.. Numerical study of composite fragment impacts onto rigid target, Composite Structures 203 (2018)
4. Pereira Michael J., Padula Santo A., Santo A., Revilock Duane M., Melis Matthew E.. NASA Technical Report. (2006)
5. High strain rate behaviour of 5-harness-satin weave fabric carbon–epoxy composite under compression and combined compression–shear loading