PSI - Issue 8

Simonetta Boria et al. / Procedia Structural Integrity 8 (2018) 102–117 Author name / St uctural Integrity Procedia 00 (2017) 000 – 0 0

115

14

10 12 14

AL HYBRID

th=6 mm

0 2 4 6 8

th=4 mm

P var (kN)

th=5 mm

0

0,02 0,04 0,06 0,08

t/D

Fig. 12. Parameter of load variation for aluminum and hybrid tubes as a function of the t/D ratio.

From Fig. 12, it is evident how, in order to reduce the P var parameter, the thickness of the tube should be minimized or the diameter should be maximized. This trend was confirmed for both the bare aluminum and reinforced tubes. As shown in Fig. 13, the hybrid tubes with a total thickness of 5 mm thick presented better results. Consequently, the correlation between such parameter and the geometrical data was not linear. In order to minimize the load fluctuations, and thus obtaining better crashworthiness performance, specific combinations of thickness and diameter should be adopted.

10 12 14

AL

HYBRID th=4 mm

0 2 4 6 8

HYBRID th=5 mm

P var (kN)

HYBRID th=6 mm

50

80

100

Diameter (mm)

Fig. 13. Parameter of load variation as a function of the diameter of the tube.

4. Conclusions

The axial crushing of circular hybrid tubes was investigated, from an experimental point of view in this study. The hybrid specimens were made with an inner tube made in aluminum and an external one made in PURE