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پایش وضعیت اتصالات چسبی تکلبه معیوب با استفاده از نانولولههای کربنی | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 18، دوره 53، شماره 2 (Special Issue)، اردیبهشت 1400، صفحه 1321-1330 اصل مقاله (2.16 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2019.16939.6479 | ||
| نویسندگان | ||
| امید سام دلیری1؛ محمدرضا فراهانی* 2 | ||
| 1دکتری، دانشکده مهندسی مکانیک، پردیس دانشکده های فنی، دانشگاه تهران، تهران، ایران | ||
| 2دانشیار، دانشکده مهندسی مکانیک، پردیس دانشکده های فنی، دانشگاه تهران، تهران، ایران | ||
| چکیده | ||
| اتصالات چسبی در سازههای مهندسی بویژه درصنایع دریایی، هوافضا، خودروسازی، نفت و گاز بهکار میروند. با توجه به اینکه اتصال ضعیفترین بخش یک سازه مهندسی محسوب میشود، احتمال شکست از محل اتصال چسبی بالا است. بنابراین، پایش وضعیت اتصال چسبی از اهمیت ویژهای برخودار است. هدف از این مقاله، پایش وضعیت آسیب در اتصال چسبی تک لبه با استفاده از نانولولههای کربنی چند جداره است. این کار با روش ثبت تغییرات مقاومت الکتریکی طی بارگذاری مکانیکی انجام شده است. این انتشار آسیب به صورت انتشار ترک در اتصال چسبی مشاهده شده است. در ابتدا نانولولههای کربنی با 9 درصد وزنی با استفاده از دستگاه آلتراسونیک درون رزین اپوکسی پراکنده شدند. پس از اضافهنمودن سختکننده، ماده بدستآمده بلافاصله درون قالب اتصال چسبی تکلبه ریخته شد. اتصال چسبی معیوب با سطح عیب %10، %30 و %70 و با عیبهای دایرهای و مربعی ساخته شد. این نمونهها تحت آزمون کشش، قرارگرفته و پاسخ مقاومت الکتریکی آن تحت بارگذاری برشی ثبت شد. نتایج نشان داد که بیشترین تغییرات کلی مقاومت در نمونه اتصال چسبی با اندازه عیب 30 درصد مربعی اتفاق افتاده و بخش زیادی از پیشرفت آسیب به صورت انتشار ترک در چسب رسانا مشاهده شد. نتایج بدستآمده نشان داد که زمانی که بخش بزرگی از ترک درون چسب و بخش اندکی از آن در مرز عیب رشد میکند، بیشترین تغییرات کلی مقاومت مشاهده میشود. | ||
| کلیدواژهها | ||
| پایش وضعیت؛ ترک؛ نانولولههای کربنی چند جداره؛ اتصالات چسبی؛ تغییرات مقاومت الکتریکی؛ حسگر | ||
| عنوان مقاله [English] | ||
| Condition monitoring of defective single lap adhesive joint using carbon nanotubes | ||
| نویسندگان [English] | ||
| Omid Sam Daliri1؛ Mohammadreza Farahani2 | ||
| 1PhD, School of Mechanical Engineering, College on Engineering, University of Tehran, Tehran, Iran. | ||
| 2Associate professor, School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran. | ||
| چکیده [English] | ||
| Adhesive joints have been employing in engineering structures such as marine, aerospace, automotive, oil, and gas industry. Since the joints are the weakest part of engineering structures, the fracture possibility in the adhesive joint is high. Therefore, structural health monitoring of adhesive joint is an important issue. The aim of this paper was condition monitoring of damage in the single lap adhesive joint by multiwall carbon nanotubes. This work is carried out by recording the electrical resistance change during the mechanical loading. This damage propagation is observed as a crack extension in the adhesive joint. Firstly, carbon nanotubes with 9 wt.% are dispersed in an epoxy resin by an ultrasonic device. Then, the hardener is added to the nono-adhesive. The obtained material is immediately poured into a single lap adhesive joint mold. The defective adhesive joints were manufactured with circular and square defects in different sizes i.e. 10%, 30%, and 70% overlap area. The specimen is subjected to a tensile test and electrical resistance changes are recorded during the shear load. The results showed that the maximum value of relative resistance change is occurring in the adhesive joint comprises of square defect with 30% overlap area of defect. In this situation, the crack was propagated in nano-adhesive and a small part of a crack was extended from the defect boundary. | ||
| کلیدواژهها [English] | ||
| Condition monitoring, Damage sensing, Carbon nanotube, Adhesive joint, Sensor | ||
| مراجع | ||
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[1] P. Ghabezi, M. Farahani, A. Shahmirzaloo, H. Ghorbani, N.M. Harrison, Defect evaluation of the honeycomb structures formed during the drilling process, International Journal of Damage Mechanics, Published online (2019). [2] F. Heidarpour, M. Farahani, P. Ghabezi, Experimental investigation of the effects of adhesive defects on the single lap joint strength, International journal of adhesion and adhesives, 80 (2018) 128-132. [3] K. Worden, E.J. Cross, N. Dervilis, E. Papatheou, I. Antoniadou, Structural health monitoring: from structures to systems-of-systems, IFAC-PapersOnLine, 48(21) (2015) 1-17. [4] J. Suhr, N. Koratkar, P. Keblinski, P. Ajayan, Viscoelasticity in carbon nanotube composites, Nature materials, 4(2) (2005) 134. [5] F. Gojny, M. Wichmann, U. Köpke, B. Fiedler, K. Schulte, Carbon nanotube-reinforced epoxy-composites: enhanced stiffness and fracture toughness at low nanotube content, Composites science and technology, 64(15) (2004) 2363-2371. [6] M. Tabasi, M. Farahani, M. Givi, M. Farzami, A. Moharami, Dissimilar friction stir welding of 7075 aluminum alloy to AZ31 magnesium alloy using SiC nanoparticles. The International Journal of Advanced Manufacturing Technology, 86(1-4) (2016) 705-715. [7] C. Stetco, O. Sam-Daliri, L.-M. Faller, H. Zangl, Piezocapacitive Sensing for Structural Health Monitoring in Adhesive Joints, in: 2019 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), IEEE, (2019) 1-5. [8] F. Du, J.E. Fischer, K.I. Winey, Effect of nanotube alignment on percolation conductivity in carbon nanotube/polymer composites, Physical Review B, 72(12) (2005) 121404. [9] B. Vigolo, C. Coulon, M. Maugey, C. Zakri, P. Poulin, An experimental approach to the percolation of sticky nanotubes, Science, 309(5736) (2005) 920-923. [10] L. Wang, Z.-M. Dang, Carbon nanotube composites with high dielectric constant at low percolation threshold, Applied physics letters, 87(4) (2005) 042903. [11] P. Ghabezi, M. Farahani, Trapezoidal traction–separation laws in mode II fracture in nano-composite and nano-adhesive joints. Journal of Reinforced Plastics and Composites, 37(11) (2018) 780-794. [12] O. Sam-Daliri, L.-M. Faller, M. Farahani, A. Roshanghias, H. Oberlercher, T. Mitterer, A. Araee, H. Zangl, MWCNT–epoxy nanocomposite sensors for structural health monitoring, Electronics, 7(8) (2018) 143. [13] J.N. Coleman, U. Khan, W.J. Blau, Y.K. Gun’ko, Small but strong: a review of the mechanical properties of carbon nanotube–polymer composites, Carbon, 44(9) (2006) 1624-1652. [14] D.D. Chung, Self-monitoring structural materials, Materials Science and Engineering: R: Reports, 22(2) (1998) 57-78. [15] O. Sam Daliri, A. Vatani, A. Bozorgmehr, Investigation of the strain sensing sensitivity of the CNT-epoxy nanocomposite via changes in electrical resistance, Aerospace Knowledge and Technology Journal, 8(1) (2019) 73-81 (In Persian). [16] O. Daliri, M. Farahani, M. Farhang, A combined numerical and statistical analysis for prediction of critical buckling load of the cylindrical shell with rectangular cutout, Engineering Solid Mechanics, 7(1) (2019) 35-46. [17] O. Sam Daliri, M. Farahani, Characterization of Stress Concentration in Thin Cylindrical Shells with Rectangular Cutout Under Axial Pressure, ADMT Journal, 10(2) (2017) 133-141. [18] C. Li, E.T. Thostenson, T.-W. Chou, Sensors and actuators based on carbon nanotubes and their composites: a review, Composites science and technology, 68(6) (2008) 1227-1249. [19] E.T. Thostenson, T.W. Chou, Carbon nanotube networks: sensing of distributed strain and damage for life prediction and self healing, Advanced Materials, 18(21) (2006) 2837-2841. [20] M. R. Hajideh, M. Farahani, N. M. Ramezani, Reinforced dissimilar friction stir weld of polypropylene to acrylonitrile butadiene styrene with copper nanopowder. Journal of Manufacturing Processes, 32 (2018) 445-454. [21] M. Moniruzzaman, K.I. Winey, Polymer nanocomposites containing carbon nanotubes, Macromolecules, 39(16) (2006) 5194-5205. [22] L. Vertuccio, L. Guadagno, G. Spinelli, P. Lamberti, V. Tucci, S. Russo, Piezoresistive properties of resin reinforced with carbon nanotubes for health-monitoring of aircraft primary structures, Composites Part B: Engineering, 107 (2016) 192-202. [23] A. Bouhamed, A. Al-Hamry, C. Müller, S. Choura, O. Kanoun, Assessing the electrical behaviour of MWCNTs/epoxy nanocomposite for strain sensing, Composites Part B: Engineering, 128 (2017) 91-99. [24] P. Ghabezi, M. Farahani, Characterization of cohesive model and bridging laws in mode I and II fracture in nano composite laminates. Journal of Mechanical Engineering and Sciences, 12(4) (2018) 4329-4355. [25] M. Khoran, P. Ghabezi, M. Frahani, M. Besharati, Investigation of drilling composite sandwich structures. The International Journal of Advanced Manufacturing Technology, 76(9-12) (2015) 1927-1936. [26] O. Sam-Daliri, L.-M. Faller, M. Farahani, A. Roshanghias, A. Araee, M. Baniassadi, H. Oberlercher, H. Zangl, Impedance analysis for condition monitoring of single lap CNT-epoxy adhesive joint, International Journal of Adhesion and Adhesives, 88 (2019) 59-65. [27] S. Yu, M.N. Tong, G. Critchlow, Wedge test of carbon‐nanotube‐reinforced epoxy adhesive joints, Journal of Applied Polymer Science, 111(6) (2009) 2957-2962. 28] E.T. Thostenson, T.W. Chou, Carbon nanotube networks: sensing of distributed strain and damage for life prediction and self healing, Advanced Materials, 18(21) (2006) 2837-2841. 29] L. Nunes, Mechanical characterization of hyperelastic polydimethylsiloxane by simple shear test, Materials Science and Engineering: A, 528(3) (2011) 1799-1804. | ||
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