Shuang Li , Yuliang Hou , Jin Huang , Jianwei Shi , Liang Meng
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引用次数: 0
Abstract
In this study, the experimental and numerical investigations are performed to explore the enhanced energy-absorption performance of hybrid polyurethane(PU)-foam-filled lattice metamaterials subjected to low-velocity impact (LVI). Initially, three types of lattices are prepared by additive manufacturing technique, and then filled with the PU foams using freeze casting technique. Experimental and numerical LVI tests have been performed to characterize the energy-absorption performance of pure and hybrid lattice structures. These experimental and numerical results indicate that the hybrid structures possess the longer elastoplastic and damage evolution stages than the pure ones. The overall absorbed energy of the hybrid structures is distinctly higher than the sum of pure lattices and PU foams, disclosing the enhancement of the energy-absorption capacity induced by the PU-foam-filling. Besides, the pure and hybrid hyperbolic lattice structures exhibit the better energy-absorption capacity than two other types, due to the compression-twist effect. As the foam collapse occurs, the lattice damages are significantly inhibited in the hybrid ones. It reveals that the filled foams protect the embedded lattices via causing foam collapse to dissipate impact energy. Meanwhile, foam-filling prevents the excessive twisting behavior of the hyperbolic lattice and makes the stress distribute more evenly.
期刊介绍:
The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them:
-Behaviour and failure of structures and materials under impact and blast loading
-Systems for protection and absorption of impact and blast loading
-Terminal ballistics
-Dynamic behaviour and failure of materials including plasticity and fracture
-Stress waves
-Structural crashworthiness
-High-rate mechanical and forming processes
-Impact, blast and high-rate loading/measurement techniques and their applications