مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه تجربی و تحلیلی پاسخ دینامیکی سازه ساندویچی با هسته لوله عمودی شیاردار تحت بار انفجاری آزاد

نویسندگان
1 دانشگاه گیلان
2 دانشگاه امام حسین، تهران
چکیده
استحکام سازه‌های ساندویچی در برابر بار انفجاری در تحقیقات مختلفی مورد بررسی قرار گرفته است. در این مطالعه، از هسته‌های لوله‌ای با شیار محیطی مقطع دایروی در سازه ساندویچی استفاده شده است. در بخش تجربی، سازه ساندویچی متشکل از ورق‌های فولادی به ضخامت 2 میلیمتر‌ و پنج هسته‌ لوله آلومینیومی با ارتفاع 30 ، قطر داخلی و خارجی بترتیب 10 و 12 میلیمتر و با 3 شیار محیطی مقطع دایروی به قطر 7/0 میلیمتر تحت بار انفجاری حاصل از 20 گرم ماده منفجره قرار گرفته است. هسته‌ها با چیدمان متقاطع و به صورت عمودی بین رویه‌های فوقانی و تحتانی سازه، قرارگرفته‌اند. تغییر شکل در هسته‌ها با اندازه‌گیری ابعاد هندسی شیار تغییر شکل یافته با تجهیز CMM بررسی شده و مقادیر جابجایی در رویه‌ها تعیین شده است. در روش تحلیلی پس از تعیین کار لولای پلاستیک شیارها در هسته‌ها، پاسخ دینامیکی سازه با استفاده از جمع کار پلاستیک همه اجزاء آن استخراج شده و رابطه میانگین نیروی لهیدگی شیارها ارائه شده است نتایج نشان می‌دهند، وجود هسته‌های شیاردار صلبیت سازه را کاهش داده و نقش ورق تحتانی در جذب انرژی را کاهش می‌دهد. در بخش جدارنازک هسته جذب انرژی سریعتر و در بخش دیگر هسته، انتقال بیشتر انرژی انجام می‌گیرد. میانگین اختلاف بین نتایج روش‌ها کمتر از 15 درصد است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental and Analytical Study of the Dynamic Response of Sandwich Structure with Grooved Vertical Tube Cores under Free Blast Load

نویسندگان English

seyed mahmood farmani 1
hashem babaei 1
Mojtaba Zia shamami 2
1 Faculty of Mechanical Engineering, University of Guilan
2 Imam Hossein University
چکیده English

The strength of sandwich structures against explosive loads has been investigated in various studies. In this study, tubular cores with a circular circumferential groove have been used in the sandwich structure. In the experimental part, the sandwich structure consisting of 2 mm thick steel plates and five aluminum tube cores with a height of 30, inner and outer diameters of 10 and 12 mm, respectively, and with three circular circumferential grooves with a diameter of 0.7 mm was subjected to an explosive load of 20g of explosive. The cores were placed in a crosswise arrangement and vertically between the top and bottom surfaces of the structure. The deformation in the cores was investigated by measuring the geometric dimensions of the deformed groove with CMM equipment, and the displacement values ​​in the surfaces were determined. In the analytical method, after determining the plastic hinge work of the grooves in the cores, the dynamic response of the structure is extracted using the sum of the plastic work of all its components, and the relationship between the average crushing force of the grooves is presented. The results show that the presence of grooved cores reduces the rigidity of the structure and reduces the role of the bottom plate in energy absorption. In the thin-walled part of the core, energy absorption is faster, and in the other part of the core, more energy is transferred. The average difference between the results of the methods is less than 15 percent

کلیدواژه‌ها English

Circular Sandwich Structure
Grooved Tubular Core
dynamic response
Plastic Hinge
Groove Crushing Force
Blast load
[1] Ru-Yang Yao, Wen-Qian Hao, Guan-Sheng Yin , Bei Zhang. Analytical model of circular tube with wide external circumferential grooves under axial crushing, International Journal of Crashworthiness. DOI: 10.1080/13588265.2019.1617096.
[2]Vivek PATEL, Gaurav TIWARI, Ravikumar DUMPALA .Review of the crushing response of collapsible tubular structures. Front. Mech. Eng. 2020, 15(3): 438–474 https://doi.org/10.1007/s11465-019-0579-1.
[3] Alexander J. An approximate analysis of the collapse of thin cylindrical shells under axial loading. Quarterly Journal of Mechanics and Applied Mathematics, 1960, 13(1): 10–15.
[ 4] Abramowicz W, Jones N. Dynamic axial crushing of circular tubes. International Journal of Impact Engineering. 1984, 2(3): 263–281.
[5] Jones N. Energy-absorbing effectiveness factor. International Journal of Impact Engineering. 2010, 37(6): 754–765 .
[6] Luo X, Xu J, Zhu J. A new method to investigate the energy absorption characteristics of thin-walled metal circular tube using finite element analysis. Thin-Walled Structures. 2015, 95: 24–30.
[7] Singace A A, Elsobky H, Reddy T Y. On the eccentricity factor in the progressive crushing of tubes. International Journal of Solids and Structures. 1995, 32(24): 3589–3602 .
[8] Gupta N, Gupta S. Effect of annealing, size and cut-outs on axial collapse behavior of circular tubes. International Journal of Mechanical Sciences. 1993, 35(7): 597–613.
[9] Karagiozova D, Jones N. Dynamic effects on buckling and energy absorption of cylindrical shells under axial impact. Thin-Walled Structures, 2001, 39(7): 583–610 .
[10] Farmani S M , Babaei H, Alitavoli M, Haghgoo M. Numerical and Experimental Investigation of Deformation of Circular Sandwich Plates with Vertical Metal Tube Core Under Free Blast Load, Modares Mechanical Engineering. 2023;23(12):673-683
[11] H M Wen a , T. X. Yu a , TY Reddy. A Note on Clamped Circular Plates under Impulsive Loading. Mechanics of Structures and Machines: An International Journal. 2007. doi.org/10.1080/08905459508905241.
[12] farmani M, Shamami M Z, Alitavoli M. Experimental and analytical study of transverse displacement of plates in a circular sandwich structure with vertical metal tube cores under free blast load. Modares Mechanical Engineering.
[13] Gerami A.Vahidi H.Ahmadi H.Liaghat G. Experimental Analysis of Impact Loading on Sandwich Panels with Glass/Epoxy Composite Faces and Cork Core. Modares Mechanical Engineering. 2025;25(01):55-63.
[14] Khodaeipour B, Khodarahmi H ,SadeghYazdi M, Ziya-Shamami M. Numerical and Experimental Study of Damage in Multi-Compartment Armor due to UNDEX. Modares Mechanical Engineering. 2024;24(08):499-509.
[15] Motamedi MA , Hashemi R. Evaluation of Temperature Effects on Forming Limit Diagrams of AA6061-T6 Considering the Marciniak and Kuczynski Model. Journal of Testing and Evaluation. 2019 Jun 28;49(2),PP.854-65.
[16] Corbett.b.m, Numerical simulations of target hole diameters for hypervelocity impacts into elevated and room temperature bumpers. International Journal of Impact Engineering. 33 (2006) 431–440.
[17] Farahani A, Hadianfard M A. Blast Loading and Evaluation of Nonlinear Response of Structural Buildings, Ferdowsi Journal of Civil Engineering. 2013;26,1.
[18] Unified Facilities Criteria (UFC). Structures to Resist the Effects of Accidental Explosions, U. S. Army Corps of Engineers, Naval Facilities Engineering Command, Air Force Civil Engineer Support Agency, UFC 3-340-02, 5 December (2008).
[19]. Abramowicz W, Jones N. Dynamic axial crushing of square tubes. International Journal of Impact Engineering. 1984, 2(2): 179–208
[20] Darvizeh.A,Gharababaei.H, Darvizeh. M, Analytical and experimental studies for deformation of circular plates subjected to blast loading. Journal of Mechanical Science and Technology .24 (9) (2010) 1855~1864, DOI 10.1007/s12206-010-0602-2.
[21].F. Mokhtarnezhada, S. Salehghaffaria and M. Tajdari .Improving the crashworthiness characteristics of cylindrical tubes subjected to axial compression by cutting wide grooves from their outer surface . International Journal of Crashworthiness. Vol. 14, No. 6, December 2009, 601–611 ,DOI: 10.1080/13588260902896466.
[22]- Jones. N.Structural impact, Cambridge university press; 2011 Dec 26.
[23] Farmani S M, Alitavoli, M, Babaei H .Investigation of dynamic response of circular sandwich plates with metal vertical tubes core under blast load. J Braz. Soc. Mech. Sci. Eng.2024 ;46, 150 https://DOI.org/10.1007/s40430-024-04707-2

[24] DarvizehA,Gharababaei H. Experimental and Analytical Investigation of Large Deformation of Thin Circular Plates Subjected to Localized and Uniform Impulsive Loading. Mechanics Based Design of Structure and Machines: An International Journal, 38:2, 171-189.
[25] Mirzababaie MT, Babaei H, Alitavoli M. Theoretical analysis on the effect of uniform and localized impulsive loading on the dynamic plastic behavior of fully clamped thin quadrangular plates. Thin-Walled Struct. 109 (2016),PP. 367–376.
[26] Hanssen AG, Langseth M, Hopperstad OS. Static and dynamic crushing of square aluminium extrusions with aluminium foam filler, Int. J. Impact Eng. 24 (5) (1999) 475–507.
[27] Zhang X, Leng K, Zhang H. Axial crushing of embedded multi-cell tubes. Int. J.Mech. Sci. 131–132 (2017) 459–470.
[28] P.s.Westine and W.E. Baker , Energy solution for predicting deformation in blast loaded structures, proc.19 th Explosive safety seminar, Hollywood Beach,Florida,U.S.A, PP.849-879(1974).
[29] Zaera R, Arias A, Navarro C.Analytical Modeling of Metallic Circular Plates to Impulsive Loads. Int. J. Solids and Structures. 2002; Vol. 39, PP 659-672 .
[30] Liaghat G H , Azad S. Z. Analysis of explosive and moldless forming of two-layer circular sheet with Using the principle of energy conservation .Journal of Algorithms and Computation. Modares Mechanical Engineering. 1387;42(1):1862-
10.22059/JAC.2013.7734
[31] Wai Fah C. Plasticity for Structural Engineers. Springer; 1st edition (1988).