Mechanical properties of 3D-printed pentadiamond

Abstract

In this work, We combined fully atomistic molecular dynamics and finite elements simulations with mechanical testings to investigate the mechanical behavior of atomic and 3D-printed models of pentadiamond. Pentadiamond is a recently proposed new carbon allotrope, which is composed of a covalent network of pentagonal rings. Our results showed that the stress-strain behavior is almost scale-independent. The stress-strain curves of the 3D-printed structures exhibit three characteristic regions. For low-strain values, this first region presents a non-linear behavior close to zero, followed by a well-defined linear behavior. The second regime is a quasi-plastic one and the third one is densification followed by structural failures (fracture). The Young's modulus values decrease with the number of pores. The deformation mechanism is bending-dominated and different from the layer-by-layer deformation mechanism observed for other 3D-printed structures. They exhibit good energy absorption capabilities, with some structures even outperforming kevlar. Interestingly, considering the Ashby chart, 3D-printed pentadiamond lies almost on the ideal stretch and bending-dominated lines, making them promising materials for energy absorption applications.

Crystal-Inspired Cellular Metamaterials and Triply Periodic Minimal Surfaces

“…Felix et al [67] obtained excellent results investigating the mechanical behavior of atomic and 3D-printed pentadiamond models. Pentadiamond is a recently proposed carbon allotrope characterized by a covalent grid of pentagonal rings [68].…”

“…Ashby chart[69] for the relative Young's modulus (Y/Y*) against the relative density (ρ/ρ*) on logarithmic scales for cellular structures with different topologies. Here, Y* and ρ* are, respectively, the Young's modulus and density of the material investigated in the literature[9,67,. Type 321 steel is a standard austenitic 18/8 chromium nickel alloy steel.…”

High-Throughput Screening of 3D-Printed Architected Materials Inspired by Crystal Lattices: Procedure, Challenges, and Mechanical Properties

“…At the same time, a number of known TPMS are quite small, and in order to further develop these fields, scientists need new perspective TPMS-like geometries. Since well-known 3D structures are crystal ones, atomic models as inputs for 3D printing of macroscopic structures may be used. ,− The surface is obtained by interpolating all of the positions of the atoms and creating a mesh, which is subsequently used as input for the manufacture of 3D printing. Some 3D-printed structures have been found to have excellent mechanical performance in uniaxial compression and ballistic impact while being extremely lightweight .…”