Damping of selectively bonded 3D woven lattice materials

Abstract

The objective of this paper is to unveil a novel damping mechanism exhibited by 3D woven lattice materials (3DW), with emphasis on response to high-frequency excitations. Conventional bulk damping materials, such as rubber, exhibit relatively low stiffness, while stiff metals and ceramics typically have negligible damping. Here we demonstrate that high damping and structural stiffness can be simultaneously achieved in 3D woven lattice materials by brazing only select lattice joints, resulting in a load-bearing lattice frame intertwined with free, ‘floating’ lattice members to generate damping. The produced material samples are comparable to polymers in terms of damping coefficient, but are porous and have much higher maximum use temperature. We shed light on a novel damping mechanism enabled by an interplay between the forcing frequency imposed onto a load-bearing lattice frame and the motion of the embedded, free-moving lattice members. This novel class of damping metamaterials has potential use in a broad range of weight sensitive applications that require vibration attenuation at high frequencies.

Pushing and Pulling on Ropes: Hierarchical Woven Materials

“…[30][31][32] As an alternative, architected materials that lack junctions or nodes, such as triply periodic minimal surface and stochastic spinodal shell designs, [24,[33][34][35] more evenly distribute stresses throughout their components but have not yet enabled repeatable large deformations without significant degradation except for designs with very low material fill fraction. [36] Wire-woven architected materials have recently been reported to have desirable energy absorption capabilities and buckling suppression, [37,38] presenting a potential approach to enable repeatable deformability, but have lacked the introduction of hierarchy to further enhance these properties.…”

Non-cuttable material created through local resonance and strain rate effects

“…Embodiments of that concept range from the atomistic scale 10 , through 3D printed structures 11 up to infrastructure level, such as seismic metabarriers 12 . Topology optimization algorithms have produced material patterns capable of focusing, turning or dispersion of blast waves 13 . www.nature.com/scientificreports www.nature.com/scientificreports/ Our recent work has shown that locally self-impacting structures can excite natural frequencies of the material to interfere with the oscillatory loads and consequently minimize vibrations 14,15 .…”

Pushing and Pulling on Ropes: Hierarchical Woven Materials

“…[30][31][32] As an alternative, architected materials that lack junctions or nodes, such as triply periodic minimal surface and stochastic spinodal shell designs, [24,[33][34][35] more evenly distribute stresses throughout their components but have not yet enabled repeatable large deformations without significant degradation except for designs with very low material fill fraction. [36] Wire-woven architected materials have recently been reported to have desirable energy absorption capabilities and buckling suppression, [37,38] presenting a potential approach to enable repeatable deformability, but have lacked the introduction of hierarchy to further enhance these properties.…”