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| CONTENTS | |
| Volume 15, Number 2, February 2023 |
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Abstract
Currently, polymer matrix nanocomposites (PMCs) are a prominent area of research due to their outstanding mechanical, thermal, and durability properties. The increase in recent studies justifies the possibility of using PMCs in structural retrofitting and reconstruction of damaged infrastructure and serving as new structural material. Using nanotechnology, nanocomposite panels in flooring combine concrete and steel, providing a very high level of performance. In sports flooring, high-performance concrete has become a challenge for reducing sports injuries and refinement in rehabilitation. As a composite material, this type of resistant concrete is one of the most durable and complex multi-phase materials. This article uses polyvinyl alcohol polymer (PVC) and multi-walled carbon nanotubes as concrete matrix fillers. Solution methods have been used for dispersing PVC and carbon nanotubes in concrete. The water-cement ratio, carbon nanotube weight ratio, and heat treatment parameters influenced the concrete nanocomposite's tensile and compressive strength. The dispersion of carbon nanotubes in cement paste and the observation of nano-microcracks in concrete was evaluated by scanning electron microscope (SEM).
Key Words
concrete; multi-walled carbon nanotubes; nanocomposite; polyvinyl alcohol; sports flooring
Address
(1) Hao Wang:
Department of Physical Education, Xi'an University of Posts and Telecommunications, Xi'an, 710121, Shaanxi Province, China;
(2) Huiwu Zhang:
Physical Education Department, Baoding Vocational and Technical College, Baoding 071051, Hebei, China.
- Study on self-compacting polyester fiber reinforced concrete and strength prediction using ANN Chella Gifta Christopher, Partheeban Pachaivannan and P. Navin Elamparithi
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| Abstract; Full Text (2260K) . | pages 85-96. | DOI: 10.12989/acc.2023.15.2.085 |
Abstract
The characteristics of self-compacting concrete (SCC) made with fly ash and reinforced with polyester fibers were investigated in this research. Polyester fibers of 12 mm long and 15 micrometer diameters were utilized in M40 grade SCC mixtures at five different volume fractions 0.025%, 0.05%, 0.075%, 0.1%, 0.3% as a fiber reinforcement. To understand the influence of polyester fibers on passing ability, flowability, segregate resistance the J ring, L box, V funnel, slump flow and U box tests were performed. Polyester fibers have a direct influence, with a maximum of 0.075% polyester fibers producing excellent characteristics. ANN models were constructed using the testing data as inputs to anticipate the fresh and hardened characteristics as targeted outputs. The research revealed that R2 values ranging from 0.900 to 0.997 appears to be a good correlation. The performance of ANN models and regression models for predicting the new characteristics of SCC is also evaluated.
Key Words
artificial neural network; compressive strength; flowability; passing ability; polyester fibers; segregation resistance; self-compacting concrete
Address
(1) Chella Gifta Christopher:
Department of Civil Engineering, National Engineering College, Kovilpatti, Tamilnadu, India;
(2) Partheeban Pachaivannan:
Department of Civil Engineering, Chennai Institute of Technology, Chennai, Tamilnadu, India;
(3) P. Navin Elamparithi:
Department of Computer Science and Engineering, National Institute of Technology, Tiruchirappalli, India.
Abstract
The nonlocal strain gradient theory for the static bending analysis of graphene nanoplatelets (GPLs) reinforced the nanoplate is developed in this paper. The nanoplatelet is exposed to thermo-mechanical loads and is also supposed to stand on an elastic foundation. For computing impressive composite material characteristics, the Halpin.Tsai model is selected for various sectors. The various distributions are propounded including UD, FG-O, and FG-X. The represented equations are acquired based on the virtual work and sinusoidal shear and normal deformation theory (SSNDT). Navier's solution as the analytical method is applied to solve these equations. Furthermore, the effects of GPL weight fraction, temperature parameters, distribution pattern and parameters of the foundation are presented and discussed.
Key Words
bending analysis; graphene nanoplatelets (GPLs); Halpin.Tsai model; nonlocal strain gradient theory
Address
Department of Solid Mechanic, Faculty of Mechanical Engineering, University of Kashan, Kashan 87317-51167, Iran.
- Creep analysis of plates made of functionally graded Al-SiC material subjected to thermomechanical loading Majid Amiri, Abbas Loghman and Mohammad Arefi
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| Abstract; Full Text (1346K) . | pages 115-126. | DOI: 10.12989/acc.2023.15.2.115 |
Abstract
This paper investigates creep analysis of a plate made of Al-SiC functionally graded material using Mendelson's method of successive elastic solution. All mechanical and thermal material properties, except Poisson's ratio, are assumed to be variable along the thickness direction based on the volume fraction of reinforcement and thickness. First, the basic relations of the plate are derived using the Love-Kirchhoff plate theory. The solution of governing equations yields an elastic solution to start creep analysis. The creep behavior is demonstrated through Norton's equation based on Pandey's experimental results extracted for Al-SiC functionally graded material. A linear variation is assumed for temperature distribution along the thickness direction. The creep strain, as well as the thermal strain, are included in the governing equations derived from classical plate theory for mechanical strain. A successive elastic solution based on Mendelson's method is employed to derive the history of stresses, strains, and displacements over a long time. History of stresses and deformations are obtained over a long time to predict damage to the plate because of various loadings, and material composition along the thickness and planar directions.
Key Words
creep; functionally graded material; Mendelson
Address
Department of Solid Mechanic, Faculty of Mechanical Engineering, University of Kashan, Kashan 87317-51167, Iran.
- Prediction of the stability of badminton net via numerical and mathematical modeling Ke Cui, Jiao Yuan and Liang Liu
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| Abstract; Full Text (1119K) . | pages 127-135. | DOI: 10.12989/acc.2023.15.2.127 |
Abstract
The present paper develops application of TSDT and MCST to analysis of a FG cylindrical micro-shell. The present model may be used as a sensor applicable in badminton net to detect contact. The radial and axial displacement components are described based on TSDT for more accurate analysis. The effect of small scales is accounted based on MCST. The solution is presented for a SS boundary condition to account the influence of various important parameters. A comparative analysis is presented to examine the effect of order of employed shear deformation theory on the axial and radial displacements.
Key Words
axial/radial displacements; FG cylindrical micro-shell; MCST; micro length scale parameter; TSDT
Address
(1) Ke Cui, Liang Liu:
College of Physical Education, Changsha University, Changsha 410000, Hunan, China;
(2) Jiao Yuan:
College of Physical Education, Hunan Normal University, Changsha 410000, Hunan, China.
- Vibrational behaviour of higher-order cylindrical shells Longjie Zhang
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| Abstract; Full Text (1152K) . | pages 137-147. | DOI: 10.12989/acc.2023.15.2.137 |
Abstract
Dynamic analysis of a shear deformable shell is investigated with accounting thickness stretching using Hamilton's principle. Through this method, the total transverse is composed into bending, shearing and stretching portions, in which the third part is responsible for deformation along the transverse direction. After computation of the strain, kinetic and external energies, the governing motion equations are derived using Hamilton's principle. A comparative study is presented before presentation of full numerical results for confirmation of the formulation and methodology. The results are presented with and without thickness stretching to show importance of the proposed theory in comparison with previous theories without thickness stretching.
Key Words
cylindrical shell; geometric parameters; Hamilton's principle; mode number; thickness stretching
Address
School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, Hubei, China.
