Influences of Elastic Foundations and Material Gradient on the Dynamic Response of Polymer Cylindrical Pipes Patterned by Carbon Nanotube Subjected to Moving Pressures
Abstract
:1. Introduction
2. Problem Description
Modeling of Material Properties
3. Basic Assumptions and Equations
4. Solution Procedure
5. Numerical Examples
5.1. Comparisons
5.2. Specific Numerical Results for the Dynamic Response of CNT-Based Cylindrical Pipes
6. Conclusions
- (a)
- In the presence of the WEF and the PEF, the critical velocity values of endless length pipes reinforced with UD, FG-V, and FG-X type CNTs were significantly reduced;
- (b)
- Considering the effect of soils, the influences of functionally graded distributions of CNTs over the cylinder thickness on the critical velocity were more pronounced than the foundationless condition;
- (c)
- When the coefficients of the EFs increased, the influence of soils on the critical velocity became apparent, while the increase in significantly reduced this effect;
- (d)
- Since infinitely long FG-V and FG-X cylindrical pipes with and without EFs were compared with the infinitely long UD-cylinder with and without EFs, respectively, the influence on the critical speed was more noticeable for the FG-X cylinder;
- (e)
- The critical velocity of moving pressure affecting the cylindrical pipes originating from CNTs on the WEF and the PEF decreased faster than the unconstrained cylinders with an increase in ;
- (f)
- Although the effect of heterogeneity did not depend on the in the unconstrained CNT-based cylindrical pipes, the effect of heterogeneity on the critical speed of the CNT-based polymer pipes on the PEF became more pronounced as the increased;
- (g)
- The dynamic coefficients of the infinite length CNT-based cylindrical pipes with UD, FG-V, and FG-X types on the WEF and PEF increased with the increasing coefficients of shear and spring layers together and separately;
- (h)
- The dynamic coefficient of the CNT-based polymer pipes with the shape FG-V on the EFs was higher than that of the pipe originating from CNTs of the shape UD on the EFs, while the dynamic coefficient of the CNT-based polymer pipes with the shape FG-X on the EFs was lower;
- (i)
- The use of EFs was one of the remarkable points and made the heterogeneous distribution of CNTs on the influence of the dynamic coefficients more obvious;
- (j)
- An increase in significantly reduced the influence of the inhomogeneous distribution of CNTs on the dynamic coefficient of polymer cylinders, since both types of EFs were taken into account;
- (k)
- As the influences of the linear variation in carbon nanotubes on and were compared with each other, the influence of heterogeneity on was approximately twice that on ;
- (l)
- With the increase in , although the dynamic coefficients increased for pipes with and without EFs, the foundation effect accelerated the increase of and ;
- (m)
- The heterogeneity effect was more prominent for cylindrical pipes originating from CNTs on the EFs and increased with the increment of in comparison with UD-cylinders.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
Abbreviations
CNT | Carbon nanotube |
EFs | Elastic foundations |
FG-V | V-type functionally graded distribution |
FG-X | X-type functionally graded distribution |
PEF | Pasternak elastic foundation |
WEF | Winkler elastic foundation |
UD | Uniform distribution |
Appendix A
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[1] | Present Study | |||
---|---|---|---|---|
0.45 | 1.35 | 1.035 | 1.348 | 1.099 |
0.12 | 0.17 | 0.28 | |
0.137 | 0.142 | 0.141 | |
1.022 | 1.626 | 1.585 | |
0.715 | 1.138 | 1.109 |
UD | FG-V | FG-X | ||
---|---|---|---|---|
= 0.12 | ||||
0 | 0 | 902.208 | 823.248 | 998.503 |
0 | 811.820 | 741.751 | 899.657 | |
785.289 | 712.616 | 875.791 | ||
1.5 × 106 | 729.337 | 650.443 | 825.992 | |
2 × 109 | 0 | 673.812 | 618.249 | 749.863 |
0.5 × 106 | 641.600 | 582.974 | 721.055 | |
1.5 × 106 | 571.755 | 505.087 | 659.678 | |
= 0.17 | ||||
0 | 0 | 1123.632 | 1025.740 | 1247.171 |
0 | 1061.269 | 969.987 | 1179.382 | |
1041.327 | 948.128 | 1161.470 | ||
1000.253 | 902.823 | 1124.791 | ||
0 | 985.445 | 902.522 | 1097.353 | |
963.936 | 878.987 | 1078.079 | ||
919.411 | 829.916 | 1038.459 | ||
= 0.28 | ||||
0 | 0 | 1290.708 | 1187.119 | 1447.294 |
0 | 1227.587 | 1132.531 | 1380.741 | |
1210.779 | 1114.290 | 1365.820 | ||
1.5 × 106 | 1176.444 | 1076.882 | 1335.476 | |
0 | 1152.882 | 1068.665 | 1302.878 | |
1134.969 | 1049.314 | 1287.054 | ||
1098.265 | 1009.502 | 1254.807 |
UD | FG-V | FG-X | |||||
(N/m3) | (N/m) | ||||||
0 | 0 | 1.223 | 1.058 | 1.289 | 1.079 | 1.171 | 1.043 |
0 | 1.337 | 1.095 | 1.455 | 1.139 | 1.249 | 1.066 | |
1.401 | 1.118 | 1.556 | 1.181 | 1.290 | 1.079 | ||
1.437 | 1.132 | 1.616 | 1.208 | 1.312 | 1.087 | ||
0 | 1.413 | 1.123 | 1.572 | 1.188 | 1.296 | 1.081 | |
1.2 × 105 | 1.500 | 1.157 | 1.722 | 1.261 | 1.349 | 1.099 | |
1.8 × 105 | 1.549 | 1.178 | 1.815 | 1.311 | 1.378 | 1.110 | |
= 0.17 | |||||||
0 | 0 | 1.128 | 1.031 | 1.160 | 1.040 | 1.100 | 1.024 |
0 | 1.153 | 1.038 | 1.193 | 1.049 | 1.119 | 1.029 | |
1.175 | 1.044 | 1.222 | 1.058 | 1.135 | 1.033 | ||
1.8 × 105 | 1.187 | 1.047 | 1.237 | 1.062 | 1.143 | 1.035 | |
0 | 1.164 | 1.041 | 1.206 | 1.053 | 1.126 | 1.031 | |
1.187 | 1.048 | 1.238 | 1.063 | 1.143 | 1.035 | ||
1.200 | 1.051 | 1.255 | 1.068 | 1.152 | 1.038 | ||
= 0.28 | |||||||
0 | 0 | 1.092 | 1.022 | 1.112 | 1.027 | 1.071 | 1.017 |
0 | 1.107 | 1.026 | 1.130 | 1.032 | 1.082 | 1.019 | |
1.121 | 1.029 | 1.147 | 1.036 | 1.092 | 1.022 | ||
1.129 | 1.031 | 1.156 | 1.039 | 1.097 | 1.023 | ||
0 | 1.113 | 1.027 | 1.136 | 1.033 | 1.086 | 1.020 | |
1.128 | 1.031 | 1.155 | 1.038 | 1.097 | 1.023 | ||
1.136 | 1.033 | 1.164 | 1.041 | 1.102 | 1.024 |
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Deniz, A.; Avey, M.; Fantuzzi, N.; Sofiyev, A.; Esencan Turkaslan, B.; Yuce, S.; Schnack, E. Influences of Elastic Foundations and Material Gradient on the Dynamic Response of Polymer Cylindrical Pipes Patterned by Carbon Nanotube Subjected to Moving Pressures. Nanomaterials 2021, 11, 3075. https://doi.org/10.3390/nano11113075
Deniz A, Avey M, Fantuzzi N, Sofiyev A, Esencan Turkaslan B, Yuce S, Schnack E. Influences of Elastic Foundations and Material Gradient on the Dynamic Response of Polymer Cylindrical Pipes Patterned by Carbon Nanotube Subjected to Moving Pressures. Nanomaterials. 2021; 11(11):3075. https://doi.org/10.3390/nano11113075
Chicago/Turabian StyleDeniz, Ali, Mahmure Avey, Nicholas Fantuzzi, Abdullah Sofiyev, Banu Esencan Turkaslan, Salim Yuce, and Eckart Schnack. 2021. "Influences of Elastic Foundations and Material Gradient on the Dynamic Response of Polymer Cylindrical Pipes Patterned by Carbon Nanotube Subjected to Moving Pressures" Nanomaterials 11, no. 11: 3075. https://doi.org/10.3390/nano11113075