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بررسی تاثیر مقیاس کوچک بر کمانش پیچشی نانو لوله های 2 تا 5 جداره محصور در محیط الاستیک تحت بارگذاری محوری و میدان دمایی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 7، دوره 46، شماره 2، اسفند 1393، صفحه 67-79 اصل مقاله (1.63 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2015.346 | ||
| نویسندگان | ||
| سیما ضیایی* 1؛ محسن اسدی پور2 | ||
| 1استادیار، دانشکده فنی و مهندسی، دانشگاه یاسوج | ||
| 2دانشجوی کارشناسی ارشد، دانشکده فنی و مهندسی، دانشگاه یاسوج | ||
| چکیده | ||
| در این پژوهش با استفاده از مدل پوسته پیوسته غیر محلی کمانش پیچشی نانو لوله های چند جداره (از 2 تا 5 جداره) محصور شده در محیطالاستیک تحت بارگذاری ترکیبی مورد مطالعه قرار گرفته است و نتایج با مدل پوسته پیوسته کلاسیک مقایسه شده است. همچنین تاثیر افزایش تعداد لایه های نانو لوله در شرایط بارگذاری و هندسی مشابه بر تنش بحرانی سنجیده شده است. نتایج نشان می دهد که اثرات غیر محلی بر مقدار تنش برشی بحرانی تاثیر می گذارد و میزان این تاثیر در نیم موجهای طولی بزرگتر بیشتر است. همچنین نشان داده شده است که در مقابل بار محوری کششی میزان تنش برشی بحرانی نانو لوله به مراتب بزرگتر از بار محوری فشاری است. در ضمن وجود محیط الاستیک پیرامون نانو لوله تاثیر مثبتی بر میزان تنش برشی بحرانی نانو لوله ها دارد. | ||
| کلیدواژهها | ||
| نانو لوله های چند جداره؛ اثر مقیاس کوچک؛ کمانش پیچشی؛ بار محوری؛ محیط الاستیک؛ میدان دمایی | ||
| عنوان مقاله [English] | ||
| The Effect of Small Scale on Torsional Buckling of the Embedded Double- to Five- Walled Nanotubes Under Axial Loading and Thermal Field | ||
| نویسندگان [English] | ||
| Sima Ziaee1؛ Mohsen Asadi-pour2 | ||
| چکیده [English] | ||
| This paper aims at investigating the torsional buckling behavior of the embedded multi-walled nanotubes (double- to five- walled) under combined loading based on the nonlocal continuum mechanics. The governing partial differential equations are derived according to Donnel shell model assumptions and Eringen elasticity theory. The effects of the number of layers of carbon nanotube, the existence of axial force, temperature change and the existence of the elastic medium on critical shear stress are studied. Results clearly reveal that at a fixed length, the carbon nanotube which has more layers can tolerate higher critical shear stress, although the existence of compressive axial force and/or temperature change at a high temperature environment decreases the load-bearing capacity of carbon nanotube. While the existence of elastic medium and/or tensile axial force increase the critical shear stress. It is also seen that with a rise in the number of half-wave, the effects of small-scale parameter on shear stress increase. The difference in predicting critical shear stress of multi-walled nanotubes between nonlocal and local continuum mechanics is investigated as well. | ||
| کلیدواژهها [English] | ||
| Multi- Walled Nanotubes, Small Scale Effect, Torsional Buckling, Axial force, Elastic medium, Thermal Field | ||
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| مراجع | ||
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[1] Li, C. Y. and Chou, T. W.; “Modeling of elastic buckling of carbon nanotubes by molecular structural mechanics approach”, Mechanics of Materials, No.36, pp. 1047- 1055, 2004. [2] Wang Yu; Wang Xiu-xi; Ni Xiang-gui; Wu Heng-au; “ Simulation of the elastic response and the buckling modes of single-walled carbon nanotubes”, Computational Materials Science, No.32, pp. 141- 146, 2005. [3] Zhang Chen-Li and Shen Hui-Shen; “Buckling and postbuckling analysis of single-walled carbon nanotubes in thermal environments via molecular dynamics simulation”, Carbon, No.44, pp. 2608- 2616, 2006. [4] Zhang H. W., Wang L., Wang J. B., “Computer simulation of buckling behavior of double-walled carbon nanotubes with abnormal interlayer distances”, Computational Materials Science, No.39, pp. 664- 672, 2007. [5] Xin Hao, Han Qiang, Yao Xiaohu, “ Buckling of defective single-walled and double-walled carbon nanotubes under axial compression by molecular dynamics simulation”, Composites Science and Technology No. 68, pp. 1809- 1814, 2008. [6]Li C. Y., Chou T. W., “A structural mechanics approach for the analysis of carbon nanotubes”, International Journal of Solids and Structures, No.40, pp. 2487- 2499, 2003. [7] Li C.Y., Chou T. W., “Elastic moduli of multi-walled carbon nanotubes and the effect of van der Waals forces”, Composites Science and Technology., No. 63, pp. 1517- 1524, 2003. [8] Hu N., Nunoya K., Pan D., Okabe T., Fukunaga H., “Prediction of buckling characteristics of carbon nanotubes”, International Journal of Solids and Structures, No. 44, pp. 6535- 6550, 2007. [9] Yakobson B.I., Brabec CJ, Bernholc J.,”Nanomechanics of carbon tubes instability beyond linear response”, Physical Review Letters, No. 76, pp. 2511- 2514, 1996. [10] Ru C.Q., “Axially compressed buckling of a double walled carbon nanotube embedded in an elastic medium”, Journal of the Mechanics and Physics of Solids, No. 49, pp. 1265- 1279, 2001. [11] Wang C.Y., Ru C.Q., Mioduchowski A., “Elastic buckling of multiwall carbon nanotubes under high pressure”, Journal of Nanoscience and Nanotechnology, No. 3, pp. 199- 208, 2003. [12] Wang C.Y., Ru C.Q., Mioduchowski A., “Axially compressed buckling of pressured multiwall carbon nanotubes”, International Journal of Solids and Structures, No. 40, pp. 3893- 3911, 2003. [13] Pantano A., Parks M. D., Boyce C. M., “Mechanics of deformation of single- and multi Mechanics and Physics of Solids, No. 52, pp. 789- 821, 2004. [14] He X. Q., Kitipornchai S., Wang C. M., Liew K. M., “Modeling of van der Waals force for infinitesimal deformation of multi-walled carbon nano-tubes treated as cylindrical shells”, International Journal of Solids and Structures, No. 42, pp. 6032- 6047, 2005. [15] Qian H., Xu K.Y., Ru C. Q., “Curvature effects on axially compressed buckling of a small-diameter double-walled carbon nanotube”, International Journal of solids and structures, No. 42, pp. 5426- 5440, 2005. [16] Wang X., Yang H. K., Dong K., “Torsional buckling of multi-walled carbon nanotubes”, Materials science and Engineering: A, No. 404, pp. 314- 322, 2005. [17] Zhang Y. Q., Liu G. R., Han X., “Effect of small length scale on elastic buckling of multi-walled carbon nanotubes under radial pressure”, Physics Letter A, No. 349, pp. 370- 376, 2006. [18] Wang X., Lu Guoxing, Lu Y. J., “Buckling of embedded multi-walled carbon nanotubes under combined torsion and axial loading”, International Journal of Solids and Structures, No. 44, pp. 336- 351, 2007. [19] Xiaohu Y., Qiang H., “The thermal effect on axially compressed buckling of a double-walled carbon nanotube”, European Journal of Mechanics A/Solids, No. 26, pp. 298- 312, 2007. [20] Sun C., Liu K., “Combined torsional buckling of multi-walled carbon nanotubes coupling with axial loading and radial pressures”, International Journal of Solids and Structures, No. 45, pp. 2128- 2139, 2008. [21] Yan Y, Wang W. Q., Zhang L. X., “ Nonlocal effect on axially compressed buckling of triple-walled carbon nanotubes under temperature field”, Applied Mathematical Modelling, No. 34, pp. 3422- 3429, 2010. [22] Hao M. J., Guo X. M., Wang Q., “Small-scale effect on tortional buckling of multi-walled carbon nanotubes”, European Journal of Mechanics A/ Solids, No.29, pp. 49- 55, 2010. [23] Xiaohu Y. and Qiang H., “A continuum mechanics nonlinear postbuckling analysis for single-walled carbon nanotubes under torque”, European Journal of Mechanics A/Solids, No. 27, pp. 796- 807, 2008. [24] Ru C. Q.,”Effective bending stiffness of carbon nanotubes”, Physical Review B, No. 62, pp. 9973- 9976, 2000. [25] Xiaohu Y. , Qiang H., “Investigation of axially compressed buckling of a multi- walled carbon nanotube under temperature field”, Composites Science and Technology, No. 67, pp. 125- 134, 2007. 26] Sun C., Liu K., “Dynamic tortional buckling of a double-walled carbon nanotube embedded in an medium”, European Journal of Mechanics A/Solids, No. 27, pp. 40- 49, 2008. | ||
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