PSI - Issue 3

7

A. Vricella et al. / Procedia Structural Integrity 3 (2017) 545–552 Antonio Vricella/ Structural Integrity Procedia 00 (2017) 000–000

551

t f h c        

(1)

min

where: - f is the coefficient called "Stability time step-factor", generally between 0.6 and 0.9; - h is the characteristic dimension finite element mesh; - c is the velocity of wave propagation in the impacted material Conclusions

Objective of the work was to report the recent results of ballistic test conducted in lab-environment by means of an in-house built electromagnetic accelerator device (rail gun) developed to perform impact test in space debris energy range. in order to explore different situations in terms of bullets energy and typology have been analyzed. The results obtained so far (the “perfect” match between the numerical simulations and the impact test results) have suggested the soundness of the proposed solution: such approach could represent the way forward in order to assess a competitive testing procedure for ballistic testing. A deeper analysis will be conducted in the next step of the research in order to develop an appropriate numerical model of the ballistic impact upon naked and micro/nano-reinforced composites. Further investigations will be carried out in order to achieve a deeper knowledge about the complex phenomena in volved during an high energy impact upon multi-layered composite materials, with the aim to gain the possibility to design and realize the optimal combination of lightweight and ballistic resistant structures for anti-debris applications.

Fig. 9. Sequence of the numerical simulation of the second test.