A new type of architectured materials, namely « monofilament entangled materials », were studied ... more A new type of architectured materials, namely « monofilament entangled materials », were studied in order to have a better understanding of their behavior under compressive loading and damping. The materials studied in this paper were made of an entanglement of a single steel wire. Their complex internal architecture was investigated using X-ray computed tomography. The evolution of the number of contacts per unit of volume, as well as of the density profile, were followed during the compression test in order to compare it to the mechanical results. Dynamical Mechanical Analysis (DMA) was performed to characterize the evolution of the loss factor of this material with the frequency and the volume fraction. It was shown that this material present an interesting strength/loss factor ratio. A discrete element model was proposed to model the mechanical properties of this material.
Playing with the architecture of a material is a promising way of tailoring its properties for mu... more Playing with the architecture of a material is a promising way of tailoring its properties for multifunctional applications. What is now referred to as ''architectured materials'' (metal foams, entangled materials, steel wool, etc.), has triggered numerous research in recent years, mostly for their ability to be engineered in order to exhibit specific combinations of properties, which ''classical materials'' could not offer. These materials have been proposed as ideal candidates for a top-down approach of ''materials by design.'' In this context, some studies have been carried out concerning entangled materials, but only a few on monofilament entangled materials. Such a material, with no filament ends, sliding contacts and a high relative porosity (80-95%), could exhibit interesting properties for shock absorption, vibration damping and ductility. The simplicity of the manufacturing process as well as the large permeability and the resistance to high and low temperatures, are also of interest for high technology applications, such as high strength seals or vibration damping materials.
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Papers by Loic Courtois