A novel bond stress-slip model for 3-D printed concretes

Abstract

<p style='text-indent:20px;'>This paper considers the 3D printing process as a discontinuous control system and gives a simple and coherent bond stress-slip model for a new and intelligent building 3-D printed concrete. The previous models focused on either the maximal stress or the maximal slip, however, the novel model uses an energy approach by the dimension analysis, so that the main factors affecting the bond stress-slip relationship can be clearly revealed, mainly including the concrete's properties (its porous structure and its strength), the steel bar's properties (its printing direction, its strength, its surface roughness and its geometrical property) and the printing process. It is confirmed that the proposed model, similar to the constitutive relationship in elasticity, plays a key role in concrete mechanics, and it can conveniently explain the observed phenomena from the experiment.</p>

Tropical algebra with high-order matrix for multiple-noise removal

“…The idempotent of the multiplicative semigroup of higher tropical matrices has been a hot topic in mathematics, and the multiple-noise removal is to harness the tropical algebra's basic properties. Due to its inherent filtering property, the tropical algebra will open up a totally new window for noise removal, some advanced applications include 3-D printing technology [41][42][43] and machine learning. 44 Tropical addition can replace traditional addition as a more effective filter in denoising.…”

Dynamic behaviors for the graphene nano/microelectromechanical system in a fractal space

“…In this paper, the two-scale fractal theory [26][27][28] is adopted to establish a fractal-fractional differential model for the graphene N/MEMS. The two-scale fractal is now widely used for fractal vibration systems, [29][30][31][32][33] the fractal diffusion, 34,35 porous concretes, [36][37][38] and dynamic economics. 39 Nonlinear problems are relatively complex, and it is difficult for us to obtain an exact solution of a nonlinear equation.…”

“…In this paper, the two-scale fractal theory 26–28 is adopted to establish a fractal-fractional differential model for the graphene N/MEMS. The two-scale fractal is now widely used for fractal vibration systems, 29–33 the fractal diffusion, 34,35 porous concretes, 36–38 and dynamic economics. 39…”

Intelligent Nanomaterials for Solar Energy Harvesting: From Polar Bear Hairs to Unsmooth Nanofiber Fabrication

“…Many research studies have revealed that the graphene distribution in a composite affected its properties greatly ( Zuo and Liu, 2021 ; Zuo, 2021 ). Geometry is always the main factor affecting materials’ properties ( He, et al, 2021b ) so that the energy absorption property of the polar bear hair.…”