Paper

Mechanical Properties of 3D-Printed Pentadiamond

Kushwaha, Brijesh, Felix, Levi C, Woellner, Cristiano F, Tiwary, Chandra S, Pal, Varinder, Galvao, Douglas S, Ambekar, Rushikesh S

2021

Overview

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.

• Publisher: Cornell University Library, arXiv.org
• Subject: Allotropy / Aramid fibers / Bending / Deformation mechanisms / Densification / Energy absorption / Kevlar (trademark) / Mechanical properties / Modulus of elasticity / Molecular dynamics / Stress-strain curves / Stress-strain relationships / Structural failure / Three dimensional models / Three dimensional printing