پیوندهای مفید
آمار
| تعداد نشریات | 8 |
| تعداد شمارهها | 438 |
| تعداد مقالات | 5,650 |
| تعداد مشاهده مقاله | 7,683,670 |
| تعداد دریافت فایل اصل مقاله | 6,339,942 |
A Theoretical and Experimental Study of Failure Maps of Sandwich Beams with Composite Skins and Honeycomb Core | ||
| AUT Journal of Modeling and Simulation | ||
| مقاله 6، دوره 42، شماره 1، تیر 2010، صفحه 37-47 اصل مقاله (929.24 K) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/miscj.2010.193 | ||
| نویسندگان | ||
| M. Sadighi؛ A. A. Dehkordi؛ R. Khodambashi | ||
| چکیده | ||
| Failure maps of sandwich panels such as beam, plate and shell are of great importance in designing such structures. In this paper, failure maps of sandwich beams with composite skin and honeycomb core are obtained. The effect of transverse shear in skins and core and the effect of double walls of honeycomb core have been taken into account. Shear deformation of skins and core are assumed to be linear. By minimizing the potential energy equation, the shear deformation coefficients of core and skins are obtained. Axial stresses in skins and core are obtained in terms of these coefficients. Core is assumed to have orthotropic properties. Three point bending tests have been performed on some sandwich beam specimens. It is found that specimens for which failure load and its corresponding failure mode lie away from the boundary lines in failure map, there is a little difference between failure loads obtained from theories and experiments but this difference is more significant near the boundary lines due to combination of failure modes. In the case of transverse ribbon direction, the theoretical and experimental results are closer. | ||
| کلیدواژهها | ||
| Sandwich beam؛ failure maps؛ Honeycomb؛ composite skins and transverse shear stress | ||
| عنوان مقاله [English] | ||
| A Theoretical and Experimental Study of Failure Maps of Sandwich Beams with Composite Skins and Honeycomb Core | ||
| چکیده [English] | ||
| Failure maps of sandwich panels such as beam, plate and shell are of great importance in designing such structures. In this paper, failure maps of sandwich beams with composite skin and honeycomb core are obtained. The effect of transverse shear in skins and core and the effect of double walls of honeycomb core have been taken into account. Shear deformation of skins and core are assumed to be linear. By minimizing the potential energy equation, the shear deformation coefficients of core and skins are obtained. Axial stresses in skins and core are obtained in terms of these coefficients. Core is assumed to have orthotropic properties. Three point bending tests have been performed on some sandwich beam specimens. It is found that specimens for which failure load and its corresponding failure mode lie away from the boundary lines in failure map, there is a little difference between failure loads obtained from theories and experiments but this difference is more significant near the boundary lines due to combination of failure modes. In the case of transverse ribbon direction, the theoretical and experimental results are closer. | ||
| کلیدواژهها [English] | ||
| Sandwich beam, failure maps, Honeycomb, composite skins and transverse shear stress | ||
| مراجع | ||
|
[1] Allen HG. Analysis and design of structural sandwich panels.London: Pergamon Press, 1969. [2] Holt PJ, Webber JPH. Exact solutions to some honeycomb beam, plate and shell problems. Journal of Strain Analysis 1982; 17( I ): l-8. [3] Gibson LJ, Ashby MF. Cellular solids: structure and properties. 2nd ed. Cambridge, UK: CambridgeUniversity Press; 1997. [4] Masters IG, Evans KE. Models for the elastic deformation of honeycombs. Compos Struct 1996;35:403–22. [5] Mukhopadhyay AK, Sierakowski RL. On sandwich beams with laminated facings and honeycomb cores subjected to hygrothermal loads: Part I. Analysis. Journal of Composite Materials1990;244:382400. [6] Wierzbicki T, Abramowizc W. On the crashing mechanics of thinwalled structures. J Appl Mech 1983;50:727–39. [7] Abramowizc W, Jones N. Dynamic axial crashing of square tubes. Int J Impact Eng 1984;2:263–81. [8] Zhang J, Ashby MF. The out-of-plane properties of honeycomb. Int J Mech Sci 1992;34(6):475–89. [9] Zhang J. The mechanics of foams and honeycombs, PhD thesis, University of Cambridge, United Kingdom, 1989. [10] Wu E, Jiang WS. Axial crush of metallic honeycomb. Int J Impact Eng 1997;9(5–6):439–56. [11] Gotoh M, Yamashita M, Kawakita A. Crush behaviour of honeycomb structure impacted by drop-hammer and its numerical analysis. Mater Sci Res Int 1996;2(4):261–6. [12] Yasui Y. Dynamic axial crushing of multi-layer honeycomb panels and impact tensile behaviour of the component members. Int J Impact Eng 2000;24:659–71. [13] Paik JK, Thayamballi AK, Kim GS. The strength characteristics of aluminium honeycomb sandwich panels. Thin-Walled Struct 1999;35:205–31. [14] Zhao H, Gary G. Crushing behaviour of aluminium honeycombs under impact loading. Int J Impact Eng 1998;21(10):827–36. [15] Baker WE, Togami TC, Weydert JC. Static and dynamic properties of high-density metal. Int J Impact Eng 1998;21(3):149–63. [16] Wierzbicki T. Crushing analysis of metal honeycombs. Int J Impact Eng 1983;1(2):157–74. [17] Shenhar Y, Frostig Y, Altus E. Stresses and failure patterns in the bending of sandwich beams with transversely flexible cores and laminated composite skins. Composite Structures 1996;35: 143 -152. [18] Triantafillou TC, Gibson LJ. Failure mode maps for foam core sandwich beams. Materials Science and Engineering 1987; 95:37-53. [19] A. Petras, M.P.F. Sutcliffe. Failure mode maps for honeycomb sandwich panels. Composite Structures 44 (1999) 237-252. [20] Ciba Composites, Duxford, England, Honeycomb Sandwich Design Technology. August 1995. [21] Anonymous, Method of flexure tests of flat sandwich structures. ASTM, 15.03 (C393-62) 1989. | ||
|
آمار تعداد مشاهده مقاله: 1,904 تعداد دریافت فایل اصل مقاله: 3,403 |
||