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Bolted space frames are usually used to allow easy assembly and disassembly, as well as replacing defective components. Although the performance of bolted space frame structures under static loads is well understood, research on the shock propagation through these frames is limited. The focus of this study is to understand shock propagation through space frames, which is a critical factor when assessing the functionality of these frames. In this research, a lab-scale space frame structure, comprising hollow square members that are connected together through bolted joints is constructed. Non-destructive impact testing is carried out on this structure and the resulting acceleration signals at various locations are recorded. The objective of this work is to develop a finite element (FE) modeling approach that can reasonably replicate experimental results.
finite element, low impact, natural frequencies, shock response, space frame
[1] Gaul, L. & Lenz, J., Nonlinear dynamics of structures assembled by bolted joints. Acta Mechanica, 125(1-4), pp. 169-181, 1997. doi: http://dx.doi.org/10.1007/bf01177306
[2] de Benedetti, M., Garofalo, G., Zumpano, M., & Barboni, R., On the damping effect due to bolted junctions in space structures subjected to pyro-shock. Acta Astronautica, 60(12), pp. 947-956, 2007. doi: http://dx.doi.org/10.1016/j.actaastro.2006.11.011
[3] Goldsmith, W. & Sackman, J.L., Energy absorption by sandwich plates: A topic in crashworthiness. In Proc. Symp. on Crashworthiness and Occupant Prot. in Transp. Systems, ASME, 126, pp. 1-30, 1991.
[4] Das Gupta, A., Santiago J.M. & Wisniewski H.L., Shock damage to sensitive compo- nents in an armored vehicle. Computers in Engineering, Proceedings of the Interna- tional Computers in Engineering Conference and Exhibit, 2, pp. 153-161, 1992.
[5] Hassan, J.E. & Frederick, G., Exact constraint design of vehicle components. SAE Spe- cial Publications: Sensors, Safety Systems, and Human Factors, pp. 55-62, 1996. doi: http://dx.doi.org/10.4271/961687
[6] Sicking, D.L., Reid, J.D. & Rohde, J.R., Development of a sequential kinking terminal for W-beam guardrails. Transportation Research Record, 1647(1), pp. 89-96, 1998. doi: http://dx.doi.org/10.3141/1647-11
[7] Ahmed, A.K.W, Haque, M.M. & Rakheja, S., Nonlinear analysis of automotive hydrau- lic mounts for isolation of vibration and shock. International Journal of Vehicle Design, 22(1), pp. 116-128, 1999. doi: http://dx.doi.org/10.1504/ijvd.1999.001862
[8] Heidari, M. & Homaei, H., Estimation of acceleration amplitude of vehicle by back propagation neural networks. Advances in Acoustics and Vibration, Art. No. 614025, 2013, 2013. doi: http://dx.doi.org/10.1155/2013/614025
[9] Ibrahim, R.A. & Pettit, C.L., Uncertainties and dynamic problems of bolted joints and other fasteners. Journal of Sound and Vibrations, 279(3), pp. 857-936, 2005. doi: http:// dx.doi.org/10.1016/j.jsv.2003.11.064
[10] Lobitz, D.W., Gregory, D.L. & Smallwood, D.O., Comparison of finite element predic- tions to measurements from the sandia microslip experiment. Proceedings of Interna- tional Modal Analysis Conference (IMAC) XIX, 2, pp. 1388-1394, 2001.
[11] Song, Y., Hartwigsen, C.J., Bergman, L.A. & Vakakis, A.F., A phenomenological model of a bolted joint. Proceedings of the 2002 American Society of Civil Engineers, Engi- neering Mechanics Conference, pp. 1-8, 2002.
[12] Song, Y., Hartwigsen, C.J., McFarland, D.M., Vakakis, A.F. & Bergman, L.A., Simula- tion of dynamics of beam structures with bolted joints using adjusted Iwan beam ele- ments. Journal of Sound and Vibration, 273(1), pp. 249-276, 2004. doi: http://dx.doi. org/10.1016/s0022-460x(03)00499-1
[13] Tao, Z., Zhao, R.J. & Yao, G.Q., Analysis and study on the static and dynamic behav- iours of jointed parts. Proceedings of the 25th International Tool Design and Research Conference, pp. 363-367, 1985.
[14] Pilkey, D.F., Park, G. & Inman, D.J., Damping matrix identification and experimen- tal verification. Proceedings of SPIE on Passive Damping and Isolation-The Interna- tional Society for Optical Engineering, 3672, pp. 350-357, 1999. doi: http://dx.doi. org/10.1117/12.349797
[15] Semke, W.H., Bibel, G.D., Jerath, S., Gurav, S.B. & Webster, A.L., A dynamic inves- tigation of piping systems with a bolted flange. ASME Pressure Vessels and Piping Conference, American Society of Mechanical Engineers, 440, pp. 121-128, 2002. doi: http://dx.doi.org/10.1115/pvp2002-1270
[16] Sabuwala, T., Linzell, D. & Krauthammer, T., Finite element analysis of steel beam to column connections subjected to blast loads. International Journal of Impact Engineer- ing, 31(7), pp. 861-876, 2005. doi: http://dx.doi.org/10.1016/j.ijimpeng.2004.04.013
[17] Thota, J., O’Toole, B.J. & Trabia, M.B., Optimization of shocks within a military ve- hicle space frame. Structural and Multidisciplinary Optimization, 44(6), pp. 847-861, 2011. doi: http://dx.doi.org/10.1007/s00158-011-0685-0
[18] Hallquist, J.O., LS-DYNA Keyword User’s Manual, Livermore Software Technology Corporation, 970, 2010.
[19] Juvinall, R.C. & Marshek, K.M., Fundamentals of Machine Component Design, vol. 83, John Wiley & Sons, Inc.: New York, pp. 418-423, 1999.