Researchers from University of Coimbra enhanced the effect of open-cell foams having a uniform cell structure
Increasing concerns regarding global warming and climate change has led to high focus on reduction in CO2 emissions. According to the paper – ‘The Effect of Fiber Orientation on the Formability and Failure Behavior of a Woven Self-Reinforced Composite’ published in 2014 in the Journal of Manufacturing Science and Engineering, the transport sector is accounts for 25% of the greenhouse emissions in Europe, 16% in Australia, and 23% in the U.S. Several studies and manufacturers are focused on decreasing weight of vehicles to reduce fuel consumptions and emitted pollutants.
Metallic foams are cellular structures that consist of solid metals with gas-filled pores comprising a large portion of the volume. These foams have high stiffness-to-weight ratio, low density, good shear and fracture strength, the damping capacity, higher natural flexural vibration frequency, and sound-absorbing capacity. Now, a team of researchers from University of Coimbra enhanced the effect of open-cell foams that have a uniform cell structure and relative densities of 20%, 40%, and 60% in the mechanical properties at high strain rates. The team also assessed aluminum tubes combined with different aluminum foams. The metallic foam was characterized on the macroscopic scale using a split Hopkinson pressure bar (SHPB).
The team found that Al6082-T4 foams promote efficient mechanical performances at high strain rates than the AlSi12 foams. The dual-size cell structure (DS) arrangement for the Al6082-T4 foams was accountable for absorbed energy values around 70% higher than with the uniform-size cell structure. The team found that energy absorption of a foam-filled tube was higher than that of the foam. According to the researchers, the findings help to enhance the design of foam-filled tubular crashworthy components. The research was published in the journal MDPI Materials on May 1, 2019.
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