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Frontiers of Structural and Civil Engineering

ISSN 2095-2430

ISSN 2095-2449(Online)

CN 10-1023/X

邮发代号 80-968

2019 Impact Factor: 1.68

Frontiers of Structural and Civil Engineering  2019, Vol. 13 Issue (2): 324-336   https://doi.org/10.1007/s11709-018-0466-6
  本期目录
Free vibration analysis of laminated FG-CNT reinforced composite beams using finite element method
T. VO-DUY1,2, V. HO-HUU1,2, T. NGUYEN-THOI1,2()
1. Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City, Vietnam
2. Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam
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Abstract

In the present study, the free vibration of laminated functionally graded carbon nanotube reinforced composite beams is analyzed. The laminated beam is made of perfectly bonded carbon nanotubes reinforced composite (CNTRC) layers. In each layer, single-walled carbon nanotubes are assumed to be uniformly distributed (UD) or functionally graded (FG) distributed along the thickness direction. Effective material properties of the two-phase composites, a mixture of carbon nanotubes (CNTs) and an isotropic polymer, are calculated using the extended rule of mixture. The first-order shear deformation theory is used to formulate a governing equation for predicting free vibration of laminated functionally graded carbon nanotubes reinforced composite (FG-CNTRC) beams. The governing equation is solved by the finite element method with various boundary conditions. Several numerical tests are performed to investigate the influence of the CNTs volume fractions, CNTs distributions, CNTs orientation angles, boundary conditions, length-to-thickness ratios and the numbers of layers on the frequencies of the laminated FG-CNTRC beams. Moreover, a laminated composite beam combined by various distribution types of CNTs is also studied.

Key wordsfree vibration analysis    laminated FG-CNTRC beam    finite element method    first-order shear deformation theory    composite material
收稿日期: 2017-06-11      出版日期: 2019-03-12
Corresponding Author(s): T. NGUYEN-THOI   
 引用本文:   
. [J]. Frontiers of Structural and Civil Engineering, 2019, 13(2): 324-336.
T. VO-DUY, V. HO-HUU, T. NGUYEN-THOI. Free vibration analysis of laminated FG-CNT reinforced composite beams using finite element method. Front. Struct. Civ. Eng., 2019, 13(2): 324-336.
 链接本文:  
https://academic.hep.com.cn/fsce/CN/10.1007/s11709-018-0466-6
https://academic.hep.com.cn/fsce/CN/Y2019/V13/I2/324
VCNT(z)=V CNT* UD
VCNT(z )=(1 +2zh)VCNT* FG-V
VCNT(z )=(1 2zh)VCNT* FG-Λ
VCNT(z )=4 |z| hVCNT* FG-X
VCNT(z )=2( 1 2|z|h )V CNT* FG-O
Tab.1  
Fig.1  
parameters (unit) matrix fiber
Poisson’s coefficient nm = 0.3 v12CNT = 0.19
mass density (kg/m3) rm = 1190 rCNT = 17.2
Yong’s modulus (GPa) Em = 2.5 E 11CNT = 600, E22CNT = 600
shear modulus (GPa) G12CNT = 10
Tab.2  
V CNT* BC mode FG-X UD FG-V FG-O
FEM (present) GDQM [2] FEM (present) GDQM [2] FEM (present) GDQM [2] FEM (present) GDQM [2]
0.12 CC 1 1.5953 1.6000 1.5052 1.5085 1.4046 1.4068 1.3166 1.3180
2 3.2568 3.2629 3.1317 3.1353 2.9980 2.9997 2.8763 2.8762
3 5.1517 5.1514 5.0022 4.9979 4.8433 4.8363 4.6940 4.6840
CH 1 1.3547 1.3577 1.2426 1.2444 1.1518 1.1529 1.0327 1.0331
2 3.1768 3.1817 3.0137 3.0159 2.8468 2.8472 2.6827 2.6814
3 5.1103 5.1092 4.9393 4.9342 4.7556 4.7474 4.5731 4.5619
HH 1 1.1139 1.1150 0.9748 0.9753 0.9451 0.9453 0.7529 0.7527
2 3.0780 3.0814 2.8722 2.8728 2.6436 2.6424 2.4588 2.4562
3 5.0713 5.0695 4.8765 4.8704 4.6768 4.6675 4.4445 4.4320
CF 1 0.4411 0.4416 0.3761 0.3764 0.3192 0.3193 0.2808 0.2809
2 1.8461 1.8497 1.6984 1.7006 1.5460 1.5473 1.4260 1.4266
3 3.8743 3.8777 3.6643 3.6648 3.4393 3.4380 3.2519 3.2489
0.17 CC 1 2.0409 2.0498 1.9083 1.9144 1.7677 1.7721 1.6471 1.6500
2 4.1962 4.2111 4.0088 4.0187 3.8242 3.8312 3.6527 3.6565
3 6.6638 6.6753 6.4310 6.4348 6.2143 6.2139 6.0025 5.9970
CH 1 1.7131 1.7188 1.5567 1.5602 1.4321 1.4344 1.2757 1.2769
2 4.0718 4.0843 3.8328 3.8402 3.6020 3.6064 3.3758 3.3772
3 6.5991 6.6094 6.3347 6.3370 6.0789 6.0765 5.8204 5.8126
HH 1 1.3808 1.3830 1.1989 1.1999 1.1601 1.1609 0.9155 0.9155
2 3.9201 3.9293 3.6235 3.6276 3.3075 3.3084 3.0591 3.0577
3 6.5365 6.5447 6.2367 6.2363 5.9550 5.9498 5.6247 5.6139
CF 1 0.5406 0.5413 0.4583 0.4587 0.3863 0.3866 0.3393 0.3394
2 2.3364 2.3437 2.1319 2.1365 1.9258 1.9287 1.7669 1.7685
3 4.9590 4.9706 4.6554 4.6614 4.3471 4.3500 4.0915 4.0913
Tab.3  
BC mode FG-X FG-UD FG-Λ
FEM (present) GDQM [2] p-Ritz [34] FEM (present) GDQM [2] p-Ritz [34] FEM (present) GDQM [2] p-Ritz [34]
HH 1 1.6423 1.6493 1.6409 1.4362 1.4401 1.4348 1.3990 1.4027 1.3975
2 4.4443 4.4752 4.4333 4.1162 4.1362 4.1050 3.8487 3.8639 3.8370
3 7.2596 7.3068 7.2258 6.8940 6.9245 6.8595 6.7349 6.7618 6.6976
CF 1 0.6566 0.6586 0.6566 0.5601 0.5612 0.5600 0.4754 0.4761 0.4753
2 2.6797 2.6987 2.6763 2.4482 2.4614 2.4449 2.2578 2.2685 2.2543
3 5.5759 5.6150 5.5589 5.2175 5.2446 5.2005 4.9767 5.0007 4.9590
Tab.4  
BC method frequency
15° 30° 45° 60° 75° 90°
CF FSDT [43] 0.9820 0.9249 0.7678 0.5551 0.3631 0.2723 0.2619
HSDT [50] 0.9832 0.9259 0.7683 0.5553 0.3631 0.2722 0.2618
present 0.9821 0.925 0.7679 0.5552 0.3632 0.2724 0.2619
HH FSDT [43] 2.6560 2.5105 2.1032 1.5368 1.0124 0.7611 0.7320
HSDT [50] 2.6563 2.5108 2.1033 1.5367 1.0121 0.7608 0.7317
present 2.6589 2.5133 2.1056 1.5386 1.0136 0.7620 0.7329
CH FSDT [43] 3.7305 3.5593 3.0573 2.3032 1.5511 1.1753 1.1312
present 3.7362 3.565 3.0625 2.3075 1.5541 1.1776 1.1335
CC FSDT [43] 4.8487 4.6635 4.0981 3.1843 2.1984 1.6815 1.6200
HSDT [50] 4.9116 4.7173 4.1307 3.1973 2.2019 1.6825 1.6205
present 4.8577 4.6725 4.1069 3.1922 2.2045 1.6862 1.6244
Tab.5  
BC mode FG-X UD FG-V FG-O
CC 1 1.0433 0.9373 0.8185 0.7923
2 2.4475 2.2568 2.0305 1.9750
3 4.1450 3.8868 3.5747 3.4902
CH 1 0.8319 0.7506 0.6294 0.6443
2 2.2198 2.0285 1.7828 1.7613
3 3.9548 3.6757 3.3259 3.2623
HH 1 0.7117 0.6576 0.5191 0.5850
2 1.8890 1.6831 1.4651 1.4086
3 3.8043 3.5198 3.1156 3.1153
CF 1 0.1939 0.1679 0.1415 0.1361
2 1.0830 0.9614 0.8306 0.8011
3 2.6458 2.4040 2.1320 2.0635
Tab.6  
BC Mode FG-X UD FG-V FG-O
CC 1 1.5074 1.4961 1.4920 1.4885
2 3.1376 3.1195 3.1170 3.1123
3 5.0127 4.9876 4.9880 4.9824
CH 1 1.2436 1.2317 1.2269 1.2211
2 3.0184 2.9976 2.9917 2.9850
3 4.9491 4.9223 4.9205 4.9137
HH 1 0.9747 0.9621 0.9602 0.9486
2 2.8755 2.8516 2.8406 2.8330
3 4.8856 4.8567 4.8532 4.8443
CF 1 0.3758 0.3703 0.3663 0.3642
2 1.6999 1.6842 1.6760 1.6707
3 3.6698 3.6437 3.6350 3.6273
Tab.7  
BC mode frequency
15° 30° 45° 60° 75° 90°
CC 1 1.5147 1.4807 1.3610 1.1086 0.7332 0.4749 0.4454
2 3.1475 3.1019 2.9388 2.5600 1.8553 1.2603 1.1870
3 5.0244 4.9699 4.7711 4.2954 3.3204 2.3617 2.2349
CH 1 1.2525 1.2120 1.0789 0.8336 0.5235 0.3319 0.3107
2 3.0315 2.9713 2.7608 2.3090 1.5833 1.0442 0.9807
3 4.9628 4.8990 4.6644 4.1056 3.0377 2.0942 1.9753
HH 1 0.9851 0.9382 0.7976 0.5782 0.3452 0.2149 0.2009
2 2.8921 2.8156 2.5534 2.0319 1.3121 0.8413 0.7883
3 4.9015 4.8272 4.5520 3.8996 2.7437 1.8317 1.7223
CF 1 0.3806 0.3596 0.2992 0.2115 0.1241 0.0768 0.0718
2 1.7115 1.6589 1.4862 1.1628 0.7394 0.4711 0.4412
3 3.6864 3.6100 3.3476 2.8006 1.9308 1.2780 1.2008
Tab.8  
BC mode frequency
15° 30° 45° 60° 75° 90°
CC 1 1.5052 1.4710 1.3507 1.0985 0.7265 0.4729 0.4441
2 3.1317 3.0858 2.9216 2.5414 1.8402 1.2550 1.1836
3 5.0022 4.9471 4.7468 4.2687 3.2962 2.3521 2.2283
CH 1 1.2426 1.2021 1.0690 0.8250 0.5185 0.3305 0.3098
2 3.0137 2.9532 2.7417 2.2897 1.5695 1.0397 0.9778
3 4.9393 4.8749 4.6383 4.0771 3.0139 2.0855 1.9695
HH 1 0.9748 0.9282 0.7886 0.5715 0.3417 0.2139 0.2003
2 2.8722 2.7952 2.5323 2.0122 1.2998 0.8377 0.7859
3 4.8765 4.8015 4.5238 3.8692 2.7203 1.8239 1.7172
CF 1 0.3761 0.3553 0.2956 0.2090 0.1229 0.0765 0.0716
2 1.6984 1.6457 1.4731 1.1511 0.7324 0.4691 0.4399
3 3.6643 3.5874 3.3242 2.7773 1.9140 1.2726 1.1973
Tab.9  
BC mode frequency
15° 30° 45° 60° 75° 90°
CC 1 1.5024 1.4677 1.346 1.0928 0.7235 0.4733 0.4448
2 3.1309 3.0843 2.9177 2.5339 1.8345 1.2564 1.1855
3 5.0047 4.9487 4.7451 4.2618 3.2890 2.3550 2.2322
CH 1 1.2390 1.1981 1.0642 0.8203 0.5164 0.3308 0.3103
2 3.0100 2.9486 2.7348 2.2803 1.5638 1.0408 0.9794
3 4.9400 4.8743 4.6339 4.0670 3.0053 2.0879 1.9729
HH 1 0.9733 0.9266 0.7870 0.5703 0.3413 0.2142 0.2006
2 2.8641 2.7862 2.5209 2.0001 1.2939 0.8385 0.7872
3 4.8757 4.7992 4.5170 3.8566 2.7116 1.8259 1.7201
CF 1 0.3727 0.3520 0.2928 0.2071 0.1222 0.0766 0.0717
2 1.6921 1.6391 1.4656 1.1438 0.7291 0.4695 0.4406
3 3.6584 3.5807 3.3149 2.7655 1.9069 1.2739 1.1992
Tab.10  
BC mode frequency
15° 30° 45° 60° 75° 90°
CC 1 1.4997 1.4647 1.3425 1.0888 0.7199 0.4721 0.4442
2 3.1273 3.0804 2.9129 2.5273 1.8269 1.2534 1.1841
3 5.0004 4.9440 4.7392 4.2533 3.2775 2.3498 2.2297
CH 1 1.2344 1.1934 1.0594 0.8158 0.5133 0.3299 0.3098
2 3.0048 2.9431 2.7283 2.2724 1.5563 1.0381 0.9782
3 4.9347 4.8686 4.6267 4.0570 2.9935 2.0829 1.9705
HH 1 0.9639 0.9174 0.7785 0.5638 0.3381 0.2135 0.2003
2 2.8581 2.7799 2.5137 1.9924 1.2875 0.8362 0.7861
3 4.8688 4.7917 4.5075 3.8440 2.6988 1.8213 1.7179
CF 1 0.3710 0.3504 0.2913 0.2060 0.1215 0.0763 0.0716
2 1.6879 1.6348 1.4609 1.1390 0.7252 0.4683 0.4400
3 3.6524 3.5744 3.3076 2.7568 1.8982 1.2707 1.1977
Tab.11  
Fig.2  
Fig.3  
Fig.4  
distribution BC mode 2 layers 3 layers 5 layers 10 layers
FG-X CC 1 1.5349 1.5202 1.5121 1.5086
2 3.1746 3.1549 3.1440 3.1392
3 5.0565 5.0332 5.0203 5.0146
CH 1 1.2772 1.2591 1.2493 1.2451
2 3.0675 3.0413 3.0269 3.0206
3 5.0002 4.9730 4.9580 4.9514
HH 1 1.0148 0.9930 0.9814 0.9764
2 2.9381 2.9046 2.8862 2.8782
3 4.9448 4.9133 4.8958 4.8882
CF 1 0.3942 0.3842 0.3789 0.3766
2 1.7437 1.7201 1.7074 1.7018
3 3.7325 3.6989 3.6805 3.6725
FG-V CC 1 1.4866 1.4984 1.5042 1.5066
2 3.1095 3.1256 3.1334 3.1366
3 4.9790 4.9983 5.0076 5.0114
CH 1 1.2243 1.2353 1.2407 1.2429
2 2.9832 3.0033 3.0131 3.0171
3 4.9107 4.9327 4.9433 4.9477
HH 1 0.9689 0.9722 0.9738 0.9745
2 2.8279 2.8551 2.8683 2.8737
3 4.8439 4.8677 4.8793 4.8840
CF 1 0.3630 0.3702 0.3739 0.3754
2 1.6675 1.6859 1.6949 1.6987
3 3.6224 3.6494 3.6626 3.6680
FG-O CC 1 1.4742 1.4934 1.5025 1.5062
2 3.0932 3.1189 3.1311 3.1360
3 4.9594 4.9903 5.0049 5.0108
CH 1 1.2044 1.2270 1.2378 1.2422
2 2.9598 2.9937 3.0098 3.0163
3 4.8867 4.9230 4.9400 4.9469
HH 1 0.9297 0.9553 0.9678 0.9730
2 2.8011 2.8441 2.8645 2.8728
3 4.8128 4.8552 4.8749 4.8830
CF 1 0.3558 0.3672 0.3728 0.3751
2 1.6490 1.6783 1.6923 1.6980
3 3.5955 3.6384 3.6588 3.6671
Tab.12  
Fig.5  
BC mode UD-X-UD X-UD-X V-X-V X-V-X Λ-X-V
CC 1 1.5105 1.5151 1.5079 1.5151 1.5688
2 3.1398 3.1470 3.1384 3.1480 3.2206
3 5.0129 5.0227 5.0135 5.0250 5.1102
CH 1 1.2484 1.2535 1.2453 1.2532 1.3201
2 3.0234 3.0319 3.0197 3.0323 3.1286
3 4.9511 4.9617 4.9503 4.9636 5.0624
HH 1 0.9812 0.9868 0.9798 0.9867 1.0685
2 2.8836 2.8936 2.8767 2.8930 3.0163
3 4.8894 4.9009 4.8875 4.9025 5.0165
CF 1 0.3789 0.3814 0.3762 0.3808 0.4193
2 1.7061 1.7127 1.7008 1.7121 1.8000
3 3.6764 3.6871 3.6710 3.6873 3.8114
Tab.13  
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