Abstract
This study is concerned with the development of a new unidirectional cellular (UniPore) copper structure with multiple concentric pipe layers. The investigated UniPore structures were grouped into three main types, each having a different number of pipes (3, 4, and 5 pipes per transversal cross-section) and different pore arrangements. The specimens were fabricated by explosive compaction to achieve tightly compacted structures with a quasi-constant cross-section along the length of the specimens. The bonding between copper pipes was observed by a metallographic investigation, which showed that the pipes and bars were compressed tightly without voids. However, they were not welded together. The mechanical properties were determined by quasi-static compressive testing, where the typical behaviour for cellular materials was noted. The study showed that porosity significantly influences the mechanical properties, even more so than the arrangement of the pipes.
Highlights
Cellular metals are some of the most suitable materials for modern lightweight engineering structures due to their mechanical and thermal properties, which result in diverse functionalities.Ashby et al [1] described the properties of cellular metals in detail, which depend mainly on the base material, porosity, morphology, topology, and fabrication procedure
The measured force–displacement relationship was used to determine the mechanical properties of the new UniPore structures, while observation of the video recordings allowed for evaluation of the deformation mechanisms during the loading process
The connectivity between the individual components of the UniPore structure depends on the colliding conditions during the fabrication process based on explosive compaction
Summary
Cellular metals are some of the most suitable materials for modern lightweight engineering structures due to their mechanical and thermal properties, which result in diverse functionalities. Ashby et al [1] described the properties of cellular metals in detail, which depend mainly on the base material, porosity, morphology, topology, and fabrication procedure. Cellular metals have been used in various applications due to their multifunctionality, including as impact energy absorbers, filters, heat exchangers, implants, and insulators. To increase their applicability and cost-efficiency, more knowledge about these complex structures should be obtained in terms of their alloy development, foam homogeneity, and process development according to Garcia-Moreno [7]
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